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Author: Donna Wentworth

How a Moss Vale Homeowner Went Fully Self-Sufficient with Solar and Battery

Harry Coomans’s Moss Vale home makes more power than it uses. He’s self sufficient, sitting in credit, and charging an electric car for next to nothing on a system that grew with his home. This is one homeowner’s honest Moss Vale solar review, and a look at what a solar and battery installation in Moss Vale can do once it is built around how a house actually uses energy.

Harry’s system did not arrive all at once. He started with solar, added a battery, then more panels, and ended up covering almost everything, including his car.

This article covers:

  • what Harry bought, and why he kept adding to his system
  • the results he has seen, in his own words
  • what the Lenergy install team was like
  • his honest take on price, value and getting the most from solar

Why did Harry choose Lenergy for solar in Moss Vale?

It started small. “I first found Winston because I needed some solar panels for a little solar project I was doing in my backyard,” Harry says. “He was happy to help me with that, and that led to a relationship now for the last two years.”

Harry’s first solar system went in back in 2019, so he was not new to it. What he wanted for the next step was someone local he could trust. “It’s good to support somebody in the local area,” he says. That mattered to him more than finding the cheapest quote.

Aerial view of a small backyard building with rooftop solar panels, part of a home solar installation in Moss Vale.

What did Harry buy, and why did he keep adding to it?

Harry already had good solar and good data. Through his monitoring he could see one clear problem. “The most wasteful thing was that I couldn’t use everything I was generating,” he says. Plenty of power, nowhere for it to go.

That is what led him to storage. A battery let him keep the surplus instead of losing it. From there he added more panels and, later, an electric car. Read more about Buying a Solar Battery here.

The result is a home that stands on its own. “We’ve got two solar systems, we’ve got the battery, we’ve got the whole thing, and we’re self-sufficient, which is just fantastic,” Harry says. He still has spare energy on top of that.

What results has Harry seen since going solar?

The headline result is simple. “We’re self-sufficient, so we’re now in credit,” Harry says. His bills went from a cost to a small return.

The electric car is where it really shows. “I’ve had the Tesla car now since April, and in all those months I’ve done 8,000 kilometres,” he says. “I wouldn’t have spent any more than $100 on electricity just to keep the car charged.”

There was a knock-on effect too. With the extra panels in, Harry says he cut his gas use over the colder months. “I’ve been able to reduce my gas bill over this winter by about 25 per cent.”

Aerial view of a large Moss Vale home with several rooftop solar panel arrays across a grey roof.

What was the Lenergy installation team like?

Harry likes to understand how things work, and the install gave him room to. “We had Ziad, who was an installer, a young guy,” he says. “Because I was a bit of a sponge, I wanted to know stuff.” He got his answers on the day.

The basics were handled well too. “The boys went up, put the panels on and cleaned up after themselves,” Harry says. For him, that came back to the kind of company he was dealing with.

Was it worth paying a bit more?

Harry was upfront that Lenergy was not the cheapest option. “We did get a couple of quotes,” he says. “Lenergy wasn’t the most competitive price, but the confidence I had in them, I didn’t mind paying a little bit extra.”

Looking back, he counts it as money well spent. “If I look at the amount we’ve invested in the battery, the solar system and the electric car, I’m earning a better rate of return than I was with my money on term deposits,” Harry says. 

A young installer on a rooftop, wearing a safety harness and using a drill during a solar panel installation.

What is Harry’s advice for other Moss Vale homeowners?

Harry’s tip is about effort, not gear. “You don’t have to get totally involved. Once you put a solar system in, it sort of takes care of itself,” he says. His one tip: “If you really want to maximise what it offers, spend a little time to understand your house and how you use your energy. It’s very worthwhile.”

That is what took his own setup from good solar to fully self-sufficient.

Read next: 5 Things To Do If You Are Considering Solar

Frequently Asked Questions

Is Lenergy a reputable solar installer in Moss Vale?

Harry’s experience says yes. He chose Lenergy partly to support a local business, found the team easy to deal with, and rated the workmanship, noting the installers cleaned up after themselves. He also valued being able to ask questions and get straight answers on install day. He was clear that Lenergy was not the cheapest quote he received, but he felt the confidence he had in them was worth a little extra. As with any installer, check they are accredited with Solar Accreditation Australia (SAA) and ask for references before you commit.

How much can I save with solar and battery storage in Moss Vale?

It depends on your home, your usage and your current bills, so there is no single figure. Harry’s own results give a sense of what is possible: his home is now in credit, he has charged an electric car for close to nothing over about 8,000 kilometres, and he cut his winter gas use by about 25 per cent after adding more panels. Those are his numbers, not a guaranteed outcome. The biggest gains tend to come when you store your surplus solar and shift more of your usage into the times your system is producing or your battery is full.

What is the best solar battery system for homes in the Southern Highlands?

The right battery depends on how much power you use and when you use it. For Southern Highlands homes, Lenergy recommends the Sigenergy SigenStor, which combines storage and solar management in one system and scales as your needs grow. It suits households like Harry’s that want to store surplus solar, run an electric car, and lean less on the grid over time. The best size and setup is worth working through with your installer rather than guessing.

Can a CEC-Approved Battery Lose Approval After Installation?

On 15 September 2026, seven battery models lost their spot on the approved products list. A CEC approved battery is not approved for life. The listing is a live status. It can be suspended, and it can be pulled.

If your battery was installed before the suspension date, you are fine. The system keeps running. The rebate stays yours. The people who need to pay attention are the ones who have paid a deposit and are still waiting on an install date.

This article covers:

  • What a CEC battery suspension actually is
  • Why it is not a safety recall
  • What happened with the seven Neovolt models
  • Where your rebate stands
  • How to check your own battery in two minutes

What does a CEC battery suspension actually mean?

The Clean Energy Council keeps the approved products list. Sitting on that list is how a battery qualifies for the federal rebate through Small-scale Technology Certificates, or STCs. That is the discount your installer takes off the quote up front, covered in more detail in how the battery rebate changed in May.

Two things can happen to a listing.

A suspension is temporary. The manufacturer gets up to three months to fix the problem. Sort it out and the listing comes back.

A de-listing is permanent. The product is removed and the manufacturer applies again from scratch.

The CEC calls it a dynamic list. Think of approval less like a certificate on the wall and more like a registration. It has to stay current.

Is a CEC suspension the same as a safety recall?

Split panel comparing a CEC battery suspension, which is a compliance issue with a three month window to fix it, against a safety recall, which tells owners to stop using the product.

No. They are separate things, and the difference matters.

Most suspensions come down to paperwork. A test certificate expires. A label does not match the documents on file. A manufacturer is slow answering questions.

A recall is a safety action. If a product is recalled, you are told to stop using it. Nobody is telling Neovolt owners to do that.

Why were seven Neovolt models suspended?

Bytewatt Technology, trading as Neovolt, had seven models flagged. BW-BAT-9.6P, plus variants I through VI. Industry was notified on 7 September 2026. The suspension took effect on 15 September 2026.

Reference card listing the seven Bytewatt Neovolt battery models suspended from the CEC approved products list on 15 September 2026.

The CEC gave three reasons. The IEC 62619 certificate used to approve variants I to VI is no longer valid. Nameplate labels on units supplied in Australia did not match the testing and certification documents originally provided. The manufacturer could not clearly distinguish which imported variants were which.

The CEC stated the decision was not based on a product recall or any identified safety issue.

Bytewatt has until 14 December 2026 to complete corrective action. Fix it and the suspension lifts. Miss it and the models are de-listed for good.

Timeline of the Neovolt battery suspension, from industry notification on 7 September 2026 to the corrective action deadline on 14 December 2026, branching to either a restored listing or permanent de-listing.

Does a CEC suspension affect a battery that is already installed?

No. Rebate eligibility is set on the installation date. If your install was completed before the suspension took effect, your STCs were already created and they stay valid.

Your battery does not stop working. Your warranty sits with the manufacturer, and a listing change does not cancel it.

One caveat worth knowing. The Clean Energy Regulator holds a separate power to deem products ineligible where they were listed using false or misleading information.

Comparison showing a CEC approved battery installed before the suspension keeps its rebate, while a battery ordered but not yet installed loses it.

What if you have ordered a battery but have not been installed yet?

This is where it hurts.

Eligibility runs off the install date. Not the order date. Not the delivery date.

Say you paid a deposit in August, with the rebate already taken off your quote. Your install is booked for October. If the model is suspended in the meantime, that rebate is gone on install day. Someone has to wear the difference.

Networks can refuse the product too. Some distributors rely on the CEC list for connection approval. State schemes lean on the same list, as covered in what the new PDRS rules mean for solar batteries.

So ask your installer to confirm the exact model number is on the current list before install day. Not the brand. The model number.

How do you check if your battery is still CEC approved?

Find the model number. It is printed on the unit and listed on your installation paperwork.

Match it against the current CEC approved batteries list, then check the product suspensions and de-listings page.

Check the model, not the brand. A manufacturer can have some models listed and others suspended at the same time. Neovolt is the proof.

Now, a cheap battery quote is cheap for a reason. Something has been left out of the price. Neovolt sat up to nearly a third below comparable known brands, and seven suspended models are what that discount looks like when it catches up with you. Valid certification and local support cost money. If a quote undercuts everything else by thousands, that gap is the thing to ask about. Read more about the problem with cheap battery quotes here.

Two questions before you sign, whether you are in NSW, the ACT or Queensland. Who backs the warranty here in Australia? How long has this exact model held its listing?

Read next: Sigenergy vs GoodWe Battery: The Key Differences

Frequently Asked Questions

What does it mean when a battery is suspended from the CEC approved products list?

It means the product has temporarily lost its listing while the manufacturer fixes a compliance problem. During the suspension the model cannot be used for new STC rebate claims. The manufacturer has up to three months. Fix it and the listing returns. Miss the window and the product is permanently de-listed.

Will I lose my solar rebate if my battery loses CEC approval after installation?

No. Eligibility is determined on the installation date. Certificates created for a completed install stay valid if the product is suspended later. The risk sits with people who have ordered but not yet been installed.

How long does a manufacturer have to fix issues before permanent CEC delisting?

Up to three months from the date the suspension takes effect. For the Neovolt models suspended on 15 September 2026, that window closes on 14 December 2026.

Is a suspended battery still safe to use?

A suspension is a compliance action, not a safety recall. In the Neovolt case the CEC stated the decision was not based on a recall or any identified safety issue. If a genuine safety problem is found, a recall is issued separately and you would be told directly.

Solar for Renters: Are Plug-In Systems the Answer? 

Solar for renters has sat in the too-hard basket for years. No roof of your own. No say over what goes on it. No simple way to cut a bill that keeps climbing.

That is starting to shift. Every state and territory has now agreed to work with the Commonwealth to make plug-in solar and batteries legal in Australia.

Nothing is legal yet. No product is on the shelf. There is real work to get through first.

Still, this is the first firm commitment from the people who can actually change the rules.

This article covers:

  • What the energy ministers have agreed to
  • How plug-in solar works, and why it suits renters
  • When it could become legal here
  • What a system might save you
  • What still has to be sorted out

What have the energy ministers actually agreed to?

Climate Change and Energy Minister Chris Bowen announced this important update for renters.

Lots of renters and people who live in apartments have raised with me that it’s not easy to get the benefits of solar and batteries. And they are right. I am really pleased that the states and territories have all agreed to work with us to make “plug in” solar and batteries legal in Australia. This will open up new choices for renters and people in apartments. There’s a lot more work to do but this is a huge step towards more cost of living relief for renters.

This is a good step in the right direction to opening up a pathway for renters to have easy access to the savings solar provides.

There is plenty of work ahead, as Bowen says himself, but the direction is the right one.

What is plug-in solar, and how does it work?

Plug-in solar, also called balcony solar, is about as simple as solar gets.

You get a compact panel, or a pair, rated around 600 to 800 watts. It connects to a small inverter or battery unit. That unit plugs into an ordinary power point.

An inverter is the box that converts power from a panel into the type of electricity your appliances can actually use. Every solar system has one.

No sparky. No roof work. No holes in someone else’s house.

The power feeds into your home circuit and offsets your usage while the sun is up. Fridge, router, standby load, whatever is running. It gets served by the panel first, so you buy less from the grid.

Moving out? Unplug it and take it with you. That is the part that makes it work for renters.

Diagram of a plug-in solar system: panel, inverter or battery unit, standard power point, then household appliances.

This is not new technology. Germany has been running it for years, with roughly one in ten households now using a system. Great Britain legalised plug-in solar in September 2026. New Zealand has committed to doing the same within twelve months.

Plug-in solar status in Germany, Great Britain, New Zealand and Australia, with Australia the only one not yet legal.

We covered the hardware in detail last time, including Sigenergy’s SigenMate 2700 Ultra, a plug-in battery already selling in Europe and not available here.

When will plug-in solar be legal in Australia?

No exact date has been set. 

The federal government has committed to working with the states and territories to identify what is needed for safe use, then report back on next steps by the end of 2026.

That report is the next real milestone. It is not legalisation. It is the piece of work that spells out what legalisation would take.

Advocacy group Solar Citizens is pushing for a firm legal date of 1 July 2027. That is their ask, not a government commitment. Worth keeping those apart when you see mid-2027 quoted.

Timeline of plug-in solar in Australia: not legal now, government report due end of 2026, July 2027 campaign target.

How much could a plug-in system save a renter?

Say you run an 800 watt setup on a balcony that gets decent sun. Reported estimates put the savings at roughly $300 to $400 a year. Add a small plug-in battery and that figure roughly doubles, because you store the cheap daytime power instead of feeding it back for next to nothing.

Systems overseas cost up to $1,300. Payback sits somewhere between four and ten years depending on whose numbers you read. 

Now, is this a replacement for a proper rooftop system? No. An 800 watt panel is a fraction of a standard install. It will not run your house, and for some homes the maths will not stack up.

For a renter paying full retail on every kilowatt hour, though, a few hundred dollars a year back in your pocket is not nothing.

Bowen has also stated that plug-in systems meeting the safety standards would be covered by the existing Cheaper Home Batteries Program and the Small-scale Renewable Energy Scheme. Details have not been worked through.

Chart comparing estimated annual savings for renters from a plug-in solar panel alone and with a small battery added.

What still has to be sorted out?

Four things, roughly.

Standards. AS/NZS 4777 governs grid-connected inverters and has no plug-in category at all. A pathway has to be written into it.

Product approval. Someone has to certify these units and publish an approved product list, the way rooftop gear is handled now.

Tenancy and strata. Rules need updating so a landlord or an owners corporation cannot unreasonably refuse.

Safety. Anti-islanding is the main one. That is the function that shuts a system down when the grid goes out, so nobody working on the line gets hurt.

Whyis it taking so long to get all this sorted? Glen Morris, who sits on the Standards Australia committees covering this equipment, argues the blocker was never safety. Europe sorted the technical side years ago. The real problem is that nobody in this country had the authority to say yes. Standards bodies wait on regulators. Regulators wait on standards. Networks will not connect a device that is not on a list.

That deadlock is exactly what the ministers’ agreement is meant to break.

Four changes needed before plug-in solar is legal in Australia: standards, product approval, tenancy rules and safety.

What can renters do in the meantime?

Three things are worth a look while the rules catch up.

Talk to your landlord. Plenty of owners will consider solar and a battery on a rental, particularly with the rebates currently on offer.

Check your electricity plan. If you are wanting some tips on how to choose a retailer you read about it in our recent article here.

If you are in an apartment, a shared system is already possible, and more incentives are coming.

None of these is plug-in solar. Each chips away at the same problem from a different angle.

Read next: Queensland’s solar for renters rebate explained

Frequently Asked Questions

What is a plug-in or balcony solar system and how does it work?

It is a compact solar panel, usually 600 to 800 watts, connected to a small inverter or battery unit that plugs into a normal power point. No electrician and no roof work. The power offsets whatever your home is using at the time, so you draw less from the grid. It is not fixed to the building, so it moves with you.

Do renters need landlord permission to install plug-in solar panels?

There is no answer to that yet, because no plug-in system is legal to use here. Tenancy and strata rules are one of the specific things the governments have said they need to work through. A freestanding unit sitting on a balcony raises different questions to anything bolted to a wall, and that distinction has not been settled.

When will plug-in solar systems be legal and available in Australia?

No date has been set. The federal government is due to report back on next steps by the end of 2026. Solar Citizens is campaigning for legal status by 1 July 2027, though that is a campaign target rather than a government commitment.

Why did Andrew go solar in Mittagong?

Two things pushed him. Rising bills, and a nudge from home.

Power prices had been climbing, and Andrew wanted to take some of the sting out. Cutting his emissions mattered too. “Helping the environment a bit,” as he put it, with his daughter “in my ear about that.” Both reasons landed him on solar as the sensible next step.

If you’re weighing the same call, it helps to work out what size solar system you actually need before you ask for quotes.

What was the quoting process like?

Short, because Andrew had already made up his mind.

“I didn’t receive any quotes from anyone else, because I kind of knew how good Lenergy were,” he said. Word of mouth did the work. People he knew had used Lenergy and rated the job. “I just wanted to get Lenergy to do it.”

Aerial view of a home surrounded by trees in Mittagong, a typical Southern Highlands setting for a solar installation.

How was the site visit?

Winston came out and walked Andrew through the whole thing, start to finish.

They talked through how the system works and the app Andrew would use to keep an eye on it. Winston also flagged a couple of tree branches near the roof. Clearing them would lift the system’s output, so it was worth doing. If you’re not sure how much difference nearby trees make, our guide on how much shade affects solar panels breaks it down.

Then there was the design. Winston placed the panels for the best result on Andrew’s roof. “He put them in the best spot he could to get the optimum capacity out of it,” Andrew said. 

What was the install team like?

Easy to deal with from the first phone call, and tidy on the day.

Andrew found the office team simple to talk to, and the on-site crew just as good. The job came back “neat and tidy.” The part that stuck with him was reliability. “They were there when they said they’d be there, which is awesome. You don’t always get that.”

Lenergy installer working on a metal roof during a solar installation in the Southern Highlands.

What happened to Andrew’s power bill?

It came down, and that matters more with prices still rising.

Andrew’s bills had jumped just before he went solar, in line with the wider increases across NSW. Since the system went in, the bills have dropped noticeably. That saving now goes towards paying off the system itself. “That will help to pay for the system moving forward,” he said. For a sense of the numbers in general terms, see our guide on how much you can save with solar panels.

Would Andrew recommend Lenergy?

Without hesitation.

“I don’t hesitate to throw Lenergy’s name up, because I know they’ll do a good job,” he said. He points people to Lenergy whenever solar or batteries come up. For him, the best part was simple. “Just a really nice bunch of people, from front office to the people that do the work.” If a home battery is on your radar too, it’s worth understanding how storage fits alongside your panels.

Thinking about solar for your own place? Read next: is your home ready for solar panels?

Frequently Asked Questions

Is solar worth it in the Southern Highlands?

For most homes, yes. Electricity prices in NSW have been rising, and a rooftop system offsets a good share of your daytime use. Andrew’s experience in Mittagong is a fair example: bills that had climbed came down after his system went in, and the saving now helps pay off the system. Your result depends on your roof, your usage and any shading, which is why a proper site visit matters.

How do I choose a solar installer?

Look for an installer accredited with Solar Accreditation Australia (SAA), then check their track record locally. Andrew skipped other quotes because people he knew had used Lenergy and rated the work. Word of mouth, a clear site visit, and a crew that turns up when they say they will are all good signs. Ask how they position the panels and how they handle anything, like nearby trees, that could affect output.

How much can solar cut my power bill?

That varies by system size, household usage and how much power you use during the day. Andrew’s bills dropped noticeably after his install, though he didn’t quote a figure, and he treats the saving as money going back into paying off the system. For a general sense of the range, see our guide on how much you can save with solar panels.

Why Is My Winter Electricity Bill So High in Southern NSW and the ACT?

In Southern NSW and the ACT the winter electricity bill climbs because we use more power at the worst possible time. Heaters work harder. Hot water runs longer. The sun clocks off early and most usage lands in the evening, the most expensive time of day to be pulling from the grid. After dark your tariff charges it’s peak rate.. so more power, right when it costs the most. The good news…it’s fixable. 

This article walks through each one, so you know what is worth changing and what is not:

  • The heating settings costing you the most
  • Why draughts make your heater work twice
  • What cold water does to your hot water bill
  • Why your solar cannot keep up in June
  • A checklist for the loads you have forgotten
Bar chart comparing a summer and a winter electricity bill. Household usage rises sharply in winter while solar production falls to around half its summer level.

Is my heater the reason my power bill is higher in winter?

Usually, yes.

Heating is the biggest single driver of winter energy costs in Australia. energy.gov.au says every extra degree can add 5 to 10% to your bill. They recommend 18 to 20 degrees. Plenty of homes sit on 25.

The worst offenders are the cheap ones. Plug-in fan heaters, oil column heaters, bar radiators. Cheap to buy, expensive to run, because they turn electricity straight into heat.

Say you run a 2 kW plug-in heater for five hours. That is 10 kWh before anything else is counted. At 35 cents a kilowatt hour, that heater costs you $3.50 a night. Run two and you are at $7 before the kettle goes on.

Cost breakdown showing a 2 kilowatt plug-in heater run for five hours uses 10 kilowatt hours, which comes to $3.50 a night at 35 cents per kilowatt hour.

A reverse cycle air conditioner moves heat rather than making it. Same job, far less electricity use.

So heat the room you are in, not the whole house. Set it sensibly and leave it there. Use the timer. Shut the door.

Why does my house cost so much to heat?

Because it leaks.

If your home lets heat out, your heater has to keep buying it back.

Plenty of older Australian homes were built with little or no insulation. Taking the right steps to insulate your household can cut heating costs by up to 45%.

Start cheap. Door snakes and weather seals on the gaps around doors and windows. Curtains closed before dark. Internal doors shut. Unsealed exhaust fans are the one most people miss.

Then the bigger items. Ceiling and wall insulation decide how hard your heater works. If you have work planned, check them then.

Cross-section of a house with arrows showing heat escaping through the ceiling, walls, windows, under doors, exhaust fans and unsealed gaps, while a heater runs inside.

Is hot water adding to my winter energy costs?

It is, and almost nobody looks at it.

Showers get longer when it is cold. The water entering your tank is colder too, so the system works harder to heat it. Same shower, more energy.

If you have solar, heat your water during solar hours on a timer or relay. That turns a grid cost into self consumption. No solar? Ask your retailer about a controlled load tariff.

If your hot water system is on its way out, look at a heat pump. Old electric tanks heat water with an element, the same way a bar heater works. A heat pump moves heat instead, which costs a lot less to run. 

Why is my solar not covering my winter bill?

Because production drops at the same time your usage climbs.

Winter days are shorter and the sun sits lower. Rooftop solar winter output is often less than half of what the same system produces in summer.

The panels produce least at exactly the hours you need most. Anything your panels are not covering gets bought from the grid instead, and the evening block is where most retailers charge their highest rate. Your heaviest hour of the day and your dearest rate of the day are the same hour.

So the bill rises even though nothing is broken. Winter can make a good solar system look like a bad one.

A battery closes that gap. A SigenStor stores your daytime solar, or cheap grid power from a free power window and releases it through the evening peak. It will not fix a leaky house or a 25 degree thermostat. It will offset your usage at the most expensive hours of the day.

Which is why a system should be sized to suit your winter load, not your summer production. Good design starts with what your home uses in July, not what the roof does in January. From there it is a question of what closes the gap. A battery. More panels to lift the winter yield. A Solar Sharer Offer, which gives you a cheap or free daytime block from your retailer to charge from. Often a mix of all three.

Chart across a full day showing winter solar production peaking around midday and falling to zero before evening, while household load peaks after dark. The shaded evening gap is the power a battery covers.

 

What else should I check before the next winter bill?

Five minutes walking around the house will find money.

  • Pool pump. Most run summer hours all year. Two extra hours a day is roughly 2 kWh, about 70 cents at 35 cents a kilowatt hour. Across a winter that adds up.
  • Clothes dryer. Spin on high first, then rack dry what you can. If it has to go on, run it in solar hours, not the evening peak.
  • Second fridges. A half-empty beer fridge draws power every hour of every day.
  • Standby loads. Computers left on, outdoor lighting with no sensor, smart home gear. Each is small. All of them running all day is not.
  • Your tariff. Check it once a year. Time of use peak rates are where winter bills do most of their damage. Read our most recent recommendations here.
Five icons for commonly missed winter loads: pool pump, clothes dryer, second fridge, standby appliances and your electricity tariff.

Read next: 5 Things To Do If You Are Considering Solar

Frequently Asked Questions

Why does my electricity bill double in winter?

Rarely one cause. Usage rises because heating runs for hours, hot water works harder and the dryer comes out more often. At the same time your solar produces less, and most of the extra load lands in the evening peak. More kilowatt hours, at a higher rate per kilowatt hour, on a bill covering the coldest months of the year.

Does solar power work less effectively in winter?

Panels handle the cold fine. Cold is not the problem. Shorter days and a lower sun angle are. Winter output is often around half of summer production, and your heaviest loads run before sunrise and after sunset when the panels are producing nothing at all.

What time of day is electricity most expensive in winter?

On most time of use tariffs, the evening peak. That is exactly when heating, cooking, lighting and the TV all come on together. Shifting what you can into the middle of the day is the simplest way to reduce your electricity bill in winter.

Will Data Centres Make Your Power Bill Go Up?

Australia’s data centres are about to use nearly seven times more electricity than they do today, going from around 5 TWh a year to 34 TWh by 2035–36. So will data centres push up your power bill? They might, and it’s being decided right now in rooms you’re not in. A roof full of panels and a battery change how much you need to buy at all.

Here’s what this article covers:

  • How much power data centres actually use
  • Whether that cost lands on households
  • Why solar alone cannot run a data centre
  • What any of it means for your roof

Why are data centres suddenly an energy story?

The number of proposed data centres has exploded. The AEMO counted 225 known data centre projects under development, up from 97 a year earlier.

In NSW, network connection enquiries reached up to 28 GW as of July, with about 13 GW in advanced discussions. The NSW Government notes that 13 GW alone is more than the state’s average daily demand.

Connection enquiries are lodged at maximum possible capacity, not expected use. AEMO found more than 40% of data centre projects proposed since 2025 have already dropped out or gone backwards. The pipeline is big and it is uncertain.

How much electricity does a data centre actually use?

AEMO’s 2026 Electricity Statement of Opportunities forecasts data centre consumption in the National Electricity Market rising from around 5 TWh in 2025–26 to 34 TWh in 2035–36. That takes them from roughly 3% of grid electricity to 13%.

That is the middle case. AEMO also modelled stronger growth reaching about 52 TWh over the same period.

The shape of the load matters as much as the size. AEMO says mature data centres run at about half their connection capacity and operate constantly, with only minor increases during working hours. Flat, day and night.

Bar chart of data centre electricity demand in Australia, rising from 5 TWh in 2025–26 to 34 TWh in 2035–36, with a dashed extension showing AEMO's higher growth case of 52 TWh.

Will data centres push my power bill up?

That depends on decisions being made right now, and those decisions aren’t finished.

Here’s the risk if it goes badly. New demand arrives, new generation fails to keep pace, and everyone competes for the same electricity. The Clean Energy Finance Corporation estimates wholesale prices would be 26% higher in NSW and 23% higher in Victoria by 2035 under that scenario. Wholesale prices reach retail bills eventually.

Network costs work the same way. The proposed 800 MW Bundey project in South Australia needs four substations and multiple new transmission lines on its own. If the rules stay silent on who funds that, it spreads across every customer.

So the real question isn’t whether data centres use a lot of power. It’s who gets made responsible for the supply and the infrastructure that use requires.

Diagram showing two outcomes for 34 TWh of new data centre demand: costs staying with the projects that cause them, or spreading to every electricity customer.

Governments are working on it. The AEMC recommended in July that new data centres prove they are backing new renewable generation, contract their own firming capacity, and register with AEMO so it can see what’s coming.

National Cabinet signed off in late August on standards requiring operators to invest in new renewable generation, with flexibility for state-owned electricity assets. Queensland and the Northern Territory took that as meaning they could decide how data centres in their states are powered. Federal Energy Minister Chris Bowen rejected that two days later, saying the standards will apply “with no exceptions and no carve-outs”. A state-owned company wanting to use coal or gas would have to prove to the Commonwealth it is cheaper than renewables. 

Bowen calls data centres “electricity whales” that “eat” energy, and puts the stakes in bill terms. Under an open slather approach in Queensland, he says, wholesale prices would be 13% higher.

Worth noting that AEMO published its forecast the day before the National Cabinet met. The 34 TWh assumes none of these obligations exist.

Legislation is expected in early 2027. Until then, none of this is settled.

Can solar power a data centre?

Partly, and only during daylight. A data centre draws close to the same load at 3am as at midday, so solar on its own leaves most of the day uncovered.

Chart comparing a data centre's flat 24-hour electricity load against a solar generation curve that peaks at midday, with the uncovered hours shaded.

Solar plus storage is the workable version. New solar and wind backed by batteries is what the Clean Energy Council has proposed data centres be required to contract, on terms of 15 to 20 years, by signing with a project directly, going through a retailer, or building the generation themselves. The length is the point. Renewable projects struggle to get finance without a long contract from a buyer who will still be there in fifteen years. Batteries then shift the midday surplus into the evening.

Same principle as a house with panels and a battery, several thousand times larger.

Side-by-side diagram of a house with rooftop solar and a battery next to a data centre with a solar farm and grid-scale battery, using the same generate-store-use loop.

What does this mean for your own house?

You don’t get a vote on any of this. Rules, connection queues, wholesale prices, none of it is yours to decide.

What you do decide is how much you buy. Right now your electricity comes from a retailer, and the retailer sets the rate. Solar and batteries give you energy independence. Your panels cover the house during the day, the battery covers the evening, and the power you use is power you generated. Whether wholesale prices go up or not, you’re protected.

Icons showing solar covering household electricity use during the day and a battery covering the evening, with grid supply set apart as the remaining exposure.

Australian households added 2.4 GW of battery storage, or 7.4 GWh, as at March 2026. Households are doing at small scale what data centres are now being asked to do at large scale.

Look, it doesn’t stack up for every home. Low daytime use, heavy shading or a short stay all change the answer. Click here to find out whether your home is ready for solar.

Frequently Asked Questions

Do data centres use a lot of electricity?

Yes. AEMO puts current use in the NEM at around 5 TWh a year, about 3% of grid electricity, growing to roughly 13% by 2035–36.

Will AI make my power bill go up?

Possibly, and it depends on rules still being finalised. If new generation and storage keep pace, the effect on household bills should be limited. If not, modelling suggests wholesale prices rise and that reaches your bill.

Can solar run a data centre at night?

No. Overnight supply has to come from storage, hydro, or other firm capacity the operator contracts.

Are data centres going to be forced to use renewable energy?

That’s the direction. National Cabinet has signed off on standards, and the federal government says data centres will need to back their load with 100% renewable energy plus firming. A state-owned energy company can apply to use something else, but has to prove it’s cheaper. Legislation is expected in early 2027.

How do I protect myself from rising electricity prices?

The only lever fully in your control is buying less from the grid.

Read next: Are AGL, Origin and Energy Australia prices going up this year?

Solar Batteries for Businesses NSW: PDRS Discounts Explained

From September 1st, a NSW business can cut the upfront cost of a battery by around 20 to 40%. For the first time Solar batteries for businesses in NSW are now properly covered by a state scheme.

How much comes off depends on the size of your battery, the installer you pick, and whether new solar goes in alongside it.

Here is what this article covers:

  • What changed for NSW businesses on 1 September
  • What the discount is actually worth
  • Whether your business qualifies
  • Why adding solar makes the discount bigger
  • What federal support you can combine it with
  • How the discount reaches you, and the one form that has to be signed first
  • Why you should not bank on 40%

What changed for NSW businesses on 1 September?

The Peak Demand Reduction Scheme, or PDRS, is a NSW government scheme. It pays for anything that cuts electricity demand during peak periods, like a hot summer afternoon. It has been running since September 2021.

Batteries under the scheme were mostly just for households until now.

From 1 September 2026, that opened up. Eligible businesses, including commercial and industrial operations, can get an upfront discount on a new battery through government-accredited suppliers.

Two size bands cover it. Batteries from 20 kWh to 200 kWh (the rules call this BESS4). Batteries from 200 kWh up to 30 MWh, or 30,000 kWh (BESS5).

Bigger battery, bigger discount. The amount scales with size.

A 20 to 50 kWh battery suits smaller operations like restaurants, takeaway shops and convenience stores. The upper end is built for factories and large industrial sites.

Homes and data centres are excluded. Apartment buildings got their own version of the discount on the same day, covered in What the New PDRS Rules Means for Solar Batteries.

Range chart comparing the two NSW business battery size bands, BESS4 at 20 to 200 kWh and BESS5 at 200 kWh to 30 MWh, with homes and data centres excluded.

How much can a NSW business save on a battery?

Around 20 to 30% off a battery installed on its own. Around 30 to 40% when it goes in with new or additional solar.

The NSW Government provided two examples with the announcement. A small business at grocery store scale, at around $37,000 off. A medium business at dairy farm scale, at around $355,000 off.

Neither example comes with a battery size attached. Treat them as a sense of scale, not a quote for your own site.

The discount amount provided above is indicative only, there are many factors that will impact the final cost such as: the installer you choose, where your site is and what it costs to get there, the battery model, how your building is designed and whether it needs additional electrical work first, the administrative cost of securing the discount, and the margin your installer charges. 

Comparison of NSW business battery discount rates, showing 20 to 30 per cent off a battery installed alone against 30 to 40 per cent when paired with new solar.

How does the small business battery incentive (BESS4) work?

BESS4 is for small and medium businesses. Shops, warehouses, offices, farms. It doesn’t apply to homes or data centres.

To qualify:

  • The site can’t have already used BESS4 or BESS5
  • The battery needs to be sized between 20 kWh and 200 kWh
  • The battery has to be on the Clean Energy Council’s list of approved batteries
  • An SAA accredited installer has to do the work
  • You need to obtain the required planning approval
  • It must be installed on or after 1 September 2026

In this band you also make a minimum payment towards the cost yourself. The discount won’t cover the whole job.

How does the commercial and industrial battery incentive (BESS5) work?

BESS5 is for bigger batteries, from 200 kWh up to 30 MWh. This one is built for factories, large warehouses and industrial sites, not homes.

To qualify:

  • The site can’t be a home or a data centre
  • The site can’t have already used BESS4 or BESS5
  • The battery needs to be tested and pass required fire safety standards
  • A licensed installer has to do the work. You can check a licence on the Service NSW website
  • You need to obtain the required planning approval
  • It must be installed on or after 1 September 2026

There’s no minimum payment in this band. Even if the battery is bigger, the incentive only counts up to the first 10 MWh.

Why does adding solar make the discount bigger?

The scheme pays more when a battery goes in with new solar. A battery charged off your own roof does more to cut peak demand than one charged off the grid.

The solar has to be new or additional. Panels already on your roof don’t count. If you have solar today and want the higher discount, you need to add more.

How much more depends on your battery. You need new solar equivalent to at least 25% of its capacity, installed within 90 days before or after. So a 100 kWh battery needs at least 25 kW of new solar.

That takes your discount from the 20 to 30% band up to the 30 to 40% band. New solar also lifts your self consumption through the day, which is when most businesses use the bulk of their power.

Diagram showing a 100 kWh battery needs at least 25 kW of new solar, installed within 90 days before or after the battery, to qualify for the higher discount.

Can it be combined with federal support for commercial solar?

Yes. NSW has confirmed the battery discount can be stacked with the Australian Government’s discounted rooftop solar scheme for commercial buildings, under the Small-scale Renewable Energy Scheme.

The Small-scale Renewable Energy Scheme will expand its limit from 100 kW to 1 MW systems, intended to start 1 October, cutting eligible commercial solar costs by around 20%. Read more about that here.

How do you get the discount on solar batteries for businesses?

There is no separate application to fill in.

Accredited Certificate Providers, businesses licensed by IPART to create certificates under the scheme, generate the Peak Reduction Certificates and pass the value back to you as a discount on your install. Your installer either is one, or partners with one.

The practical steps look like this.

Get multiple quotes. Ask each installer directly whether they offer this discount and whether it is included in the number they have given you.

Choose a battery. Not every model is eligible, and not every installer offers the same discount on the same model.

Sign the nomination form. Now, this is the part to get right. The form has to be signed and returned before installation begins. Work already completed will not be reimbursed. Signing late means losing the discount entirely.

Then the install goes ahead. Afterwards you sign a Post Implementation Declaration confirming the requirements were met, and your installer photographs the work as proof.

Commercial installs also take time. Site assessment, electrical upgrades, network and planning approvals, equipment lead times. If you want a battery running before next summer’s peak, the design work starts well before then.

If something goes wrong later, start with your installer. If that doesn’t resolve it, the Accredited Certificate Provider named on your nomination form is next. IPART administers the scheme and sits above both.

Four step process for getting the Solar Batteries for businesses discount, highlighting that the nomination form must be signed before installation begins.

Why shouldn’t you assume you’ll get 40% off?

Because these are certificates, not a fixed rebate.

Their value moves with the market. Every provider charges a different fee.

The 20 to 40% figure is a government estimate across a range of system sizes. It is not a promise attached to your quote. The government says so itself, and its own advice is to compare quotes from several installers who offer the discount. Prices for the same equipment vary more than most people expect: Why Do Solar Companies Charge Different Prices For The Same Products?

Now, the honest part. A battery does not suit every business. If your site runs mostly through daylight hours, sits on a flat tariff with no demand charge, and rarely loses power, the numbers may not stack up even with a discount on the table. Some sites are better off putting the money into solar alone.

Minister for Climate Change and Energy Penny Sharpe put the intent plainly: “NSW wants more batteries, and these changes will help more people cut their power bills, whether they are running a business or living in an apartment.”

Get the figures for your own site before you decide.

Read next: What the New PDRS Rules Means for Solar Batteries

Frequently Asked Questions

What is the Peak Demand Reduction Scheme and how does it apply to businesses?

The PDRS is a NSW government scheme running since September 2021. It rewards anything that cuts electricity demand during peak periods. From 1 September 2026, eligible NSW businesses can use it to get an upfront discount on a battery between 20 kWh and 30 MWh.

How much of a discount can NSW businesses get on commercial battery storage?

Around 20 to 30% off a battery on its own, or around 30 to 40% when new solar goes in with it. In dollar terms, the government has cited about $37,000 for a small business such as a grocery store, and about $355,000 for a medium business such as a dairy farm. The government calls these figures indicative.

Do I need to install solar panels to be eligible for the PDRS battery discount?

No. A battery on its own qualifies. New solar simply increases the discount, provided it is equivalent to at least 25% of the battery’s capacity and installed within 90 days before or after it.

How do I get the battery discount for my business in NSW in 2026?

Through your installer. There is no separate application. Get several quotes, confirm the discount is included, then sign the nomination form before any installation work starts. Signing after work has begun means the discount is lost.

South Australia Solar Just Powered the Grid in Winter

South Australia just proved that solar is capable of supporting the electricity grid. In a recent event observed by the AEMO, rooftop solar met 99.9% of grid demand setting a new record for winter.

Here is what happened:

  • What South Australia’s solar record actually was
  • Why the same afternoon set a national record
  • What the batteries were doing
  • What it means for solar owners in NSW, the ACT and Queensland

What happened at 1:30pm?

South Australia’s demand for grid-scale generation fell to 2 MW. Homes and businesses were running almost entirely on power made on their own roofs.

At the same time the National Electricity Market set a new winter minimum operational demand record of 11,992 MW, beating the 12,144 MW set in August 2024. Operational demand is the power the grid has to supply. Rooftop solar pushes it down, because those homes are not asking for much.

Across the NEM, rooftop solar was supplying close to 54% of underlying demand. Renewables of all kinds accounted for 71% of generation.

Bar showing rooftop solar covering 99.9% of South Australian demand, with grid-scale generation at 2 MW

Why is a winter record a bigger deal?

Winter is solar’s hard season. The sun sits lower and the days are shorter. It shows that rooftop solar can carry a state through its weakest months.

Five tiles showing South Australia solar, renewables, battery charging and hydro pumping shares at the grid's winter low

What were the batteries doing?

Working hard. Wholesale prices went negative across every NEM region, from -$7.40/MWh in Queensland to -$8.60/MWh in Tasmania. Negative prices mean more power is available than the market needs.

Batteries treated that as an opportunity. Charging soaked up around 10.5% of everything being generated, with hydro pumping taking another 2%. That midday surplus was not wasted. It was held and released into the evening peak.

Diagram of a home battery charging from midday solar and powering the house during the evening peak

What does this mean for NSW, the ACT and Queensland?

The same grid, the same direction. Queensland saw negative prices that afternoon too.

Rooftop solar is now the biggest single generator in the country by the middle of the day, and AEMO is planning the system around it. More storage. More flexibility.

For a homeowner the read is simple. Midday power is abundant. The households getting the most from it are the ones storing it rather than exporting it, which is worth weighing up when deciding what battery you install.

Read next: the five best ways to use three free hours of daytime energy

Frequently asked questions

Can rooftop solar really power a whole state on its own?

For short periods, yes. South Australia came within 0.1% of it at 1:30pm. Holding that around the clock is a different problem, which is where storage comes in.

Why do electricity prices go negative?

When more power is being generated than the market needs, generators pay to keep supplying rather than shut down and restart. It happens most often on sunny, mild days with low demand.

Could NSW or Queensland reach the same point?

Both are heading the same way. Queensland recorded negative prices in the same window. Neither has South Australia’s rooftop solar density yet, so the milestone will come later there.

Sigenergy vs GoodWe Battery: The Key Differences 

Sigenergy vs Goodwe, the two biggest battery brands on the market right now. They look similar, but every day I have clients asking me what are the actual differences between them.

Here at Lenergy we prefer Sigenergy. This article will break down exactly what the real differences are and how they will actually impact your user experience.

  • How the two platforms differ once you look past the casing
  • The warranty number that separates them most clearly
  • What the software does to your bills over ten years
  • Why the installer matters more than either badge

What is the difference between Sigenergy and GoodWe batteries?

Both are all-in-one home energy storage systems. An inverter or energy controller sits on top of a stack of battery modules. Both offer whole-home backup, app control and the option to add capacity later. Both use lithium iron phosphate cells, the safer chemistry for a home.

The Sigenstor stormed the market when it was first introduced and has set the standard for batteries since with its innovative all-in-one design. Some say Goodwe was copying Sigenergy’s homework when designing their battery and it certainly looks like it. However, once we get into what’s underneath the differences are clear.

Copying a shape is the easy part. Rebuilding the engineering and the software behind it takes years.

How do the Sigenergy and GoodWe specs compare?

Sigenergy SigenStorGoodWe ESA
Usable capacity per moduleAround 9 kWh Around 8 kWh, 8.32 kWh total 
Cell format314 Ah class, fewer and larger More cells, smaller format 
Cycle rating10,000 8,000 
Warranted throughput~3.7 MWh per usable kWh ~3.0 MWh per usable kWh
Backup transfer time0 ms Around 4 ms
Integrated DC EV chargingYes, 25 kW module No equivalent
V2G and V2H hardware pathwayYes Not currently

Amp hours (Ah) measure how much charge a single cell holds. A 314 Ah cell stores about 1 kWh on its own, so a 9 kWh module needs around nine of them. Smaller cells mean you need more of them, and more internal connections to join them up.

Fewer, larger cells means fewer internal connections. Fewer connections means fewer places for something to go wrong across fifteen years. That does not guarantee a longer life on its own. Cell quality, thermal management and the battery management system all matter too. It is simply a design choice we are more comfortable with.

Diagram comparing battery Sigenergy vs Goodwe module internals. Sigenergy uses four large cells with three internal connections. GoodWe uses twelve smaller cells with eleven connections.

Does the warranty difference actually matter?

This is the clearest measurable gap, and it is worth a minute of your time.

Throughput is the total energy a battery can pass through before the performance warranty limit is reached. Think of it as the odometer rather than the age of the car.

Sigenergy’s Australian warranty lists around 3.7 MWh of warranted throughput for every usable kWh of capacity. GoodWe’s lists around 3.0 MWh. On a comparable capacity basis, that is roughly 23% more energy through the battery before the guarantee runs out.

Whether that matters depends entirely on how you use it.

Say your battery does one gentle cycle a day. Solar fills it, the house empties it overnight. Neither battery will get near its limit inside ten years.

Now say you are on a time-of-use tariff. You charge from solar through the middle of the day. You discharge into the evening peak. You charge again on cheap overnight rates. You join a VPP and the battery discharges when wholesale prices spike. That is two or three cycles a day, and the odometer climbs quickly.

For that household, 23% more headroom is not cosmetic. It is the difference between a warranty that lasts the distance and one that runs out early. As the electricity grid becomes increasingly dynamic this is becoming a more important spec for batteries.

Bar chart comparing warranted throughput per usable kilowatt hour. Sigenergy at 3.7 megawatt hours, GoodWe at 3.0, a 23 per cent difference.

What does the battery software actually do for you?

Software is one the bigger differences, Sigenergy built its ecosystem around one coordinated system from the start. Solar, battery, inverter, gateway, smart loads and EV charging all talk to each other. The mySigen app pulls in your household consumption, solar forecasts and weather data, then works out when to charge and when to discharge.

GoodWe has added AI scheduling, dynamic pricing support and its SEMS platform. The features exist. The platform is less mature.

Now, here is why we care about this more than the spec sheet.

Your electricity bill is getting more complicated, not less. Feed-in tariffs keep falling. Time-of-use pricing is spreading. VPP payments and dynamic tariffs all reward a battery that can think about timing.

A battery that cannot respond to that is not ready for the increasingly dynamic trajectory of the Australian grid.

Diagram of a home energy management system coordinating solar, battery storage, EV charging, household loads, weather forecasts and dynamic pricing.

Is Sigenergy better than GoodWe if you drive an EV?

Yes, and this is one of the clearer gaps between them.

Sigenergy offers an integrated 25 kW DC EV charging module that sits in the same tower. It draws directly from solar, battery or grid. It is also built for vehicle-to-home and vehicle-to-grid, so your car’s battery can eventually support the house.

GoodWe sells EV chargers. It does not currently offer an equivalent integrated DC module or the same bidirectional readiness.

If an EV is in your plans over the next five years, this is worth real money. If it is not, skip past this one. It does not apply to you.

Diagram comparing integrated DC charging, which runs solar to battery to car directly with a vehicle-to-home return path, against separate AC charging with extra conversion steps.

Can you avoid running a cable to the switchboard?

With Sigenergy, often yes. Your battery needs to know how much power the house is drawing, and a sensor at the switchboard reports that back. Normally over a data cable that has to be physically run between them.

Sigenergy offers a wireless kit that does the same job without the cable. It works to around 200 metres and handles walls and electrical noise well. GoodWe does not currently offer an equivalent official kit.

On a straightforward install this will not matter. On a property where the switchboard and battery sit far apart, or where running cable is difficult and expensive, it removes a common headache and keeps everything inside the one system.

Which differences impact you less than you might think?

DifferenceOn paperIn your home
Safety designSigenergy uses five protection layers including aerogel insulation and internal fire suppression. GoodWe uses LFP cells, aerosol suppression, heating and multiple electrical safeguardsNeither is unsafe. Sigenergy’s package is the more considered design.
Backup switchover0 ms against roughly 4 msA technical win for Sigenergy but your appliances will barely  notice either one
Mixing old and new modulesSigenergy did it first with per-module optimisers. GoodWe now offers similar flexibilityGap closed. Both let you expand later

What is the risk of the cheaper batteries?

The GoodWe is a good battery. However, you have to be careful about what a low price tends to attract. A quote that competes purely on price has to find that money somewhere. Some of it is the equipment, which is fair enough. The rest can come out of design time, consultation, backup scope, switchboard compliance work, commissioning, or the margin that pays for someone to come back when something needs attention in year six.

So compare what is actually included. Two quotes carrying the same battery can be very different jobs.

Stacked bar chart showing where the difference between a higher quote and a lowest quote comes from, including equipment, design time, switchboard scope, commissioning and after-sales support.

Sigenergy vs GoodWe: which battery should you buy?

We prefer Sigenergy, and we will say it plainly. Stronger architecture, more warranted throughput, more mature software, a clearer EV pathway. Across ten to fifteen years we think the extra cost comes back.

What matters most when considering a battery is who installs it.

Both batteries are a significant investment into your home and you are entering into a relationship with the company that installs it. If all goes well this could be for 10-15 years, at the end of the day you want a company that will still be there for you. 

Check the installer holds SAA accreditation. Check the ABN history, read the reviews, and pay attention to how the company replies to the negative ones. Ask for public liability and professional indemnity cover.

This is probably the largest electrical upgrade your home will ever have. Take the time to get it right.

Read next: The problem with cheap home battery quotes

Frequently asked questions

What are the main differences between Sigenergy and GoodWe batteries?

Cell architecture, cycle rating, warranted throughput, software maturity and EV integration. Sigenergy leads on all five. GoodWe comes at a lower price. The differences that matter most to you depend on how hard you plan to work the battery.

Is Sigenergy or GoodWe more compatible with existing solar systems?

Both are all-in-one systems designed around their own inverter rather than bolted onto an existing one. If you already have solar, either can be retrofitted, though the design work differs depending on your current inverter, its age and your switchboard. This is a question for a site assessment rather than a spec sheet.

What Has the Impact of Solar Batteries Been? 

Half a million Australian homes now have a solar battery. So Australia’s grid operator, AEMO, took 10,000 of them and compared them to 10,000 homes running solar alone. They found the impact of solar batteries was that homes cut their evening peak grid use by 73%, and we explain why.

Here is what this article covers:

  • What the AEMO solar battery study actually measured
  • The 73% figure, and how it breaks down across NSW, the ACT and Queensland
  • Why the evening peak is the costly part of your day
  • What a 73% drop does not mean for your bill

What did the AEMO solar battery study actually measure?

The study sits inside AEMO’s Quarterly Energy Dynamics report for the June 2026 quarter.

AEMO took two sample groups. Each had 10,000 detached houses. Every home had rooftop photovoltaic solar panels under 20 kW. One group had solar only. The other had solar plus a battery, installed between 1 July and 1 December 2025.

Then it compared their smart meter data across the whole quarter.

The measure was net grid imports during the evening peak, 4pm to 9pm. Net means power bought from the grid minus power sent back to it. That distinction matters, and we will come back to it.

Two panels comparing 10,000 solar-only homes with 10,000 solar-plus-battery homes in the AEMO study.

How much do solar batteries reduce grid usage?

Across the national market, battery homes pulled 0.7 kW less from the grid during the evening peak. That is a 73% reduction against the solar-only group.

The figure moves by region:

RegionAverage cut in evening peak grid imports
Queensland0.9 kW
New South Wales0.7 kW

There is a second finding worth noting. Battery homes switched to net exports later in the morning, because the battery charged first. They then kept exporting later into the evening. The battery covered the house and still had surplus going out. That is home battery storage changing grid reliance in both directions.

Household uptake explains why this now shows up in national data. NSW has installed 4,865 MWh of battery capacity since July 2025. Queensland has 2,570 MWh. Nationally that is 389,137 installations in twelve months.

Bar chart showing average reduction in evening peak grid imports: 0.9 kW in Queensland, 0.7 kW in New South Wales, 0.7 kW nationally.

Why does the evening peak matter?

Think about when your house actually uses power. Lights on. Oven going. Heating or cooling running. Someone in the shower.

That is 4pm to 9pm, and your panels stopped producing an hour ago.

So you buy it back, at the hours grid electricity tends to cost the most on a time of use plan. Meanwhile your solar spent all day feeding power back for next to nothing.

A battery closes that gap. It stores the midday surplus and releases it after sunset. That is self consumption, which simply means using your own power instead of renting it back from your retailer.

The AEMO figures show how much of that evening a battery can genuinely cover.

Daily profile comparing a solar-only home with a solar-plus-battery home, showing the impact of solar batteries was exported later and imported less across the 4pm to 9pm peak.

Does a 73% drop mean a 73% lower bill?

No. This is the part worth being straight about.

The 73% measures grid imports across a five hour window. It is not your total household usage. It is not your bill.

Your bill still covers the rest of the day, your daily supply charge, and whatever the battery could not carry on a heavy night.

Averages hide that. A battery sized to your average day will still buy power on the cold nights, the guest nights, the 9pm load of washing. We use 24 kWh as a starting reference when, then size a system to suit the house in front of us.

Two more limits are worth naming. The homes in the study chose to add a battery, so they are not a perfect stand-in for the average household. AEMO also found home battery charging pushed daytime demand up. Storage moves load to times where the grid has a higher supply of electricity. It does not erase it.

Two panels comparing the evening peak with one battery home against hundreds of thousands, showing the peak flattening at scale.

What has the impact of solar batteries been on the grid?

Less stress on the network when it is under the most.

The 4pm to 9pm window is the hardest part of the day for the electricity grid. Demand climbs as people get home. Solar has stopped producing. That is when the system strains.

A battery takes that load off. Not by using less power, but by supplying it from a box on the wall instead of pulling it down the street.

One home doing that does nothing for the grid. Hundreds of thousands doing it across the same five hours takes real pressure off the network.

That is the impact so far. Homes covering their own evenings, and a peak that is easier for the system to carry.

Read next: The problem with cheap home battery quotes

Frequently Asked Questions

What did the AEMO study find about solar batteries in Australian homes?

AEMO compared 10,000 solar-only homes against 10,000 solar-plus-battery homes over the June 2026 quarter. Battery homes reduced their net grid imports during the 4pm to 9pm evening peak by 0.7 kW on average, a 73% reduction. Battery homes also kept exporting to the grid later into the evening.

How much can solar batteries reduce reliance on the electricity grid?

In peak hours, substantially. AEMO measured a 73% cut in evening peak grid imports across the national market, with Queensland homes averaging a 0.9 kW reduction and NSW homes 0.7 kW. Over a full day the reduction is smaller, because batteries draw power to charge and most homes still buy from the grid at some point.

Are solar batteries worth it for Australian homeowners?

It depends on your usage shape and your tariff. A household that uses most of its power after dark and pays a high evening rate gets more from storage than a household that is out all evening. Sometimes, for some homes, the figures do not stack up. Check your own bill against your usage pattern before deciding.

Reliable Off-Grid Power in Kangaroo Valley

Reliable off-grid power is one of the most important aspects of survival for living in rural  Australia.

Recently we installed a 17 kW solar system with 40 kWh of battery storage on a property in the hills above Kangaroo Valley. Fully off-grid. No poles, no wires, no retailer.

This article walks through that job, and through what it actually takes to make off-grid solar reliable enough to live on all year.

Here is what the job involved:

  • Why this property went off-grid in the first place
  • The system we installed, spec by spec
  • Why we rebuilt work that was already half done
  • What makes an off-grid system reliable, and when it does not stack up

Why go off-grid instead of connecting to the grid?

For a lot of rural blocks, the grid is the expensive option.

Running new poles and wires out to a remote property can cost tens of thousands of dollars, and on longer runs it climbs past $50,000. You pay that once. Then you keep paying network charges and retail rates forever after.

Off-grid changes the maths. You spend that money on your own generation and storage instead of renting your electricity from someone else. No network charges. No rate rises. No outage because a storm dropped a line twenty kilometres away.

Aerial view of the off-grid Kangaroo Valley property showing three solar arrays across the roof, with rural paddocks and a dirt access track surrounding the house

What is in the Kangaroo Valley system?

The setup is straightforward once it is laid out.

  • 17 kW solar array 
  • Sigenergy SigenStor, 40 kWh of battery storage
  • 12 kW single-phase inverter
  • Gateway tied into the main switchboard

In the plant room, the solar DC cables run through the wall, along the concrete ceiling, and down into the inverter. The battery modules stack underneath it. The gateway then links the inverter to the main switchboard so the house draws from solar first and the batteries overnight.

Two Lenergy installers mounting a stacked Sigenergy SigenStor battery system against the wall beside the switchboard

Why did we rebuild work that was already done?

Because it had not been completed and not all of it was up to standard.

The install was half finished by a previous installer when we were called in. Ziad, our lead installer, took the team back through the existing work and brought it up to current Australian standards before finishing the job.

Ziad Hadba, Lenergy lead installer, standing in front of a sandstone wall at the Kangaroo Valley site

What makes an off-grid system reliable?

Four things, mostly.

A real load assessment, not a guess. Daily kWh use and peak simultaneous loads, measured properly.

Sizing for the worst month of the year rather than the average one.

Enough storage to ride out a run of poor weather. One to three days of autonomy is the usual target for a residential off-grid solar installation.

Compliance with AS/NZS 4509, the Australian standard for stand-alone power systems.

Most off-grid homes still keep a backup generator. In a well-sized system it barely runs.

Is off-grid right for your property?

Sometimes, for some homes, it does not make financial sense.

If there is already a grid connection at your fence, staying connected with solar and a battery is usually cheaper and simpler. Off-grid earns its keep when the connection quote is high, the supply is unreliable, or you want out of the retail market entirely.

Federal STCs still apply to the solar on most stand-alone systems, and the battery may qualify for the Cheaper Home Batteries Program.

Read next: 5 Things To Do If You Are Considering Solar.

Frequently Asked Questions

How much does an off-grid solar and battery system cost in Kangaroo Valley?

It depends on how much power the property uses and how much autonomy you want. The honest answer is that off-grid pricing is driven by your load, not your roof size, which is why the assessment comes before the quote.

What size solar and battery system do I need for a rural property in NSW?

A family home off-grid commonly lands somewhere around 8 to 15 kW of solar with 30 to 50 kWh of storage. The Kangaroo Valley property sits above that at 17 kW and 40 kWh. Small cabins need far less.

Is off-grid solar reliable enough for full-time living in Kangaroo Valley?

Yes, when it is sized and installed properly. That is the whole condition. A correctly designed system runs the house day and night through winter with the generator sitting idle most of the year.

The problem with cheap home battery quotes

Same home, same battery but two different quotes?. One is a little more than you hoped. The other is so cheap it stops you in your tracks….and here’s why that’s the one you should worry about.

Most people read that gap as a win. It is better read as a question. Cheap home battery quotes in Australia are rarely cheap because someone found a better deal on hardware. They are cheap because something has been left out, usually the part you cannot see once the job is done.

Here is the bit that matters most. You get the federal rebate once per property. Get it wrong and there is no second go.

This article covers:

  • Why some home battery quotes come in so far below the rest
  • Where cheap quotes cut corners
  • What it costs a household when a cheap install goes wrong
  • A checklist to run over any quote before you sign

Why are some home battery quotes so cheap?

Because the real costs of a battery install do not move.

There is the battery. A matched inverter. Cabling and protection to Australian standards. A licensed electrician on site for the day. Switchboard work in a lot of homes. Paperwork, insurance and freight.

The Cheaper Home Batteries Program discount is already inside the number you are quoted, applied at the point of sale. A headline price of a few thousand dollars sits on a system worth far more.

Our friends over at Solar Quotes ran the numbers on one way this goes wrong. A system advertised at $6,000 installed, with a rebate worth around $16,800, is really a $22,800 job. GST is owed on the full $22,800, roughly $2,073. Charge it on the $6,000 alone and you remit about $545. After hardware, almost nothing is left for labour, insurance and support.

DISCLAIMER: These figures are taken from what would have been a a job don before the rebates dropped in May. Current rebate figures will differ. Read more about what rebates are currently available here.

Bar chart comparing a $6,000 advertised battery price against the $22,800 the installed system is actually worth.

Now think about what that leaves the business. A price that thin is not a bargain being passed on. It is a margin too small to send a qualified team, hold spare parts, or answer the phone in three years.

A battery is not a fridge you plug in. It is a small power station bolted to your garage wall, wired into your switchboard. Do it once and do it right. The only thing more expensive than a good roofer is a bad one.

Where do cheap home battery quotes cut corners?

Almost always on the installation side.

Labour. There is a rumour doing the rounds, and it is worth calling it a rumour, not a fact. Some installs are said to be happening with no qualified sparky on site, with an accredited electrician turning up another day to take the compliance photos and sign off work he did not do.

Sizing. The classic is a 50 kWh battery stack sold with a 5 kW inverter. The inverter moves power in and out of the battery, and its size sets how fast that happens. A 5 kW inverter cannot fill a 50 kWh stack in a day, and nowhere near it in winter. Planning to charge inside a free electricity window? You will fill a fraction of it. Read more her about why the size of your inverter matters more than you think here.

Split diagram showing a 5 kW inverter filling only part of a 50 kWh battery beside a correctly matched system.

The bits left off the quote. Switchboard upgrades, circuit protection and correct labelling, added as extras once the job has started. Or whole-home blackout protection that turns out to be a single circuit.

Brands. A battery warranty is only worth the company standing behind it. Even large manufacturers get this wrong, and the LG battery recall is the one most homeowners still remember. A brand that landed here last year with an importer and a website is riskier again. We install SigenStor because Sigenergy has been here long enough to answer the phone, and because fire suppression sits inside the module.

What happens when a cheap battery install goes wrong?

The Clean Energy Regulator inspected 1,278 battery systems installed under the Cheaper Home Batteries Program between July 2025 and April 2026, about 0.5% of all installs. Of those, 60.8% were substandard and 1.2% were judged unsafe. For a thorough breakdown of what happened read our article about what the 60% substandard install figure actually shows.

Grid of 100 house icons with 61 shaded to show the share of inspected battery installs found to be substandard.

Plenty of those faults were labelling and paperwork. Plenty were not. Loose wiring, poor connections, cable left without proper protection.

Complaints have followed. Reports to the ACCC about home batteries and new energy services rose 107% over twelve months.

Then there is the quiet problem. Orphan systems. The installer has folded, the warranty is a piece of paper, and nobody wants to touch their wiring.

We have seen where that ends. One homeowner came to us with an oversized battery on an undersized inverter, in a model already discontinued. Nothing could be added, nothing swapped. The whole lot came out. That was their one rebate, spent.

Diagram showing the federal battery rebate claimed once for a property, with a second claim marked unavailable.

How do I compare home battery installation quotes?

Run every quote through this before you sign.

  • Get three written quotes, each based on a site visit. No site inspection, no quote worth reading. (It is possible to do an inspection over the phone the designer just needs thorough photos of your switchboard battery location, inverter and property. If someone is trying to give you a price prior to receiving these they shouldn’t be trusted.)
  • Check the installer is accredited with Solar Accreditation Australia, and that the battery and inverter are both on the Clean Energy Council approved product list. Rebate eligibility depends on all three.
  • Look up the company’s ABN registration date. One registered around April 2025, when the rebate was announced, deserves a second look.
  • Insist on itemisation. Exact battery model, usable capacity in kWh, inverter model and size, every piece of electrical work, and the product, performance and workmanship warranties.
  • Read the substitution clause. Wording that lets a company swap in similar components is how bait and switch happens.
  • Read the one-star reviews, not the five-star ones. CHOICE and Solar Quotes are worth reading before you shortlist anyone.
  • Never sign on the doorstep. Unsolicited sales carry a ten-day cooling off period under Australian Consumer Law.
  • A familiar face fronting the ads is not a credential. Neither is a countdown timer.
Checklist card listing eight things to verify on a home battery quote before signing, including SAA accreditation.

None of this is a reason to skip a battery. Solar and storage together are cutting real money off real bills, and more again inside a virtual power plant. The rebate is worth taking advantage of

Spend it once. Price is what you pay. Value is what you get, and those are not the same number.

Read next: Mistakes to avoid when buying a solar battery.

Frequently asked questions

What is a fair price for home battery installation in Australia?

There is no single number, because usable capacity, inverter size and the electrical work at your place all move it. Compare quotes on installed cost per usable kWh after the rebate, with the same inverter size across all three. A cheaper quote is not automatically wrong. It is always worth asking what the other two included that this one did not.

How do I know if a cheap battery quote is too good to be true?

Look at what is missing rather than what is cheap. No site visit, no itemised component list, no named installer, a substitution clause buried in the terms, an ABN registered in 2025, or pressure to sign this week. One of those is worth a question. Three is worth walking away.

Does the Cheaper Home Batteries Program affect the cost of battery installation?

Yes. The discount is applied at the point of sale through small-scale technology certificates, so the price you are quoted already has it built in. It steps down over time and applies once per property, which is why the first system you install is the one that counts. Read more here.