Already have solar panels on the roof and wondering whether to add a battery? You're not alone. Home batteries are one of the fastest-growing upgrades in Australia, helped along by the federal battery rebate and evening power prices that keep creeping up. The first question almost everyone asks is simple: what's the solar battery price going to be?
This guide focuses on the cost of the battery itself, especially if you're adding one to an existing solar system. You'll see typical prices by size and brand in 2026, what the rebate takes off, how long it might take to pay back and how to tell if a quote is fair.
Solar battery price in Australia: quick answer
In 2026, most installed home batteries cost roughly $800 to $1,300 per kWh before rebates. After the federal rebate, that typically falls to around $650 to $1,100 per kWh, with larger batteries usually working out cheaper per kWh.
Here's what that looks like for common battery sizes:
| Battery size | Typical price before rebate | Approx. federal rebate | Typical price after rebate |
|---|---|---|---|
| 5 kWh | Around $7,400 | Around $1,250 | Around $6,100 |
| 10 kWh | Around $11,400 | Around $2,500 | Around $8,900 |
| 13.5 kWh | Around $13,900 | Around $3,400 | Around $10,500 |
| 27 kWh | Around $25,900 | Around $6,800 | Around $19,000 |
These are average installed prices from mid-2026 market data. Your quote could be higher or lower depending on brand, installer, location and how complex the installation is.
Solar battery cost by brand
Brand makes a big difference. Here are typical installed prices for some popular batteries in Australia, based on installer quotes checked in late 2026:
| Battery | Usable capacity | Installed, before rebate | After federal rebate |
|---|---|---|---|
| Sungrow SBR 9.6 | 9.6 kWh | $7,500 to $9,000 | $5,000 to $6,500 |
| Alpha ESS SMILE 10.1 | 10.1 kWh | $8,000 to $11,000 | $5,400 to $8,400 |
| BYD Battery-Box HVM 11.0 | 11 kWh | $8,500 to $11,500 | $5,700 to $8,700 |
| Sigenergy SigenStor 10 | 10 kWh | $10,500 to $13,500 | $7,900 to $10,900 |
| Tesla Powerwall 3 | 13.5 kWh | $15,000 to $17,000 | $11,500 to $13,500 |
Some batteries, like the Tesla Powerwall 3 and Sigenergy SigenStor, include a built-in inverter, which partly explains their higher price. Others may need a separate hybrid or battery inverter, which can add to the cost if your current inverter isn't compatible.
A higher price doesn't automatically mean a better battery for your home. The right choice depends on your usage, your existing solar setup and the installer's support.
How much does the battery rebate take off?
The federal Cheaper Home Batteries Program cuts the upfront cost of eligible batteries, usually as a discount on your quote. For batteries installed by the end of 2026, it's worth roughly $272 per kWh for the first 14kWh, before any admin fees, with a smaller discount on capacity above that. The rate steps down every six months from January 2027.
Some states, including NSW, Victoria, South Australia and Western Australia, have offered their own battery incentives too. These change often, so check your state government's energy website or ask your installer what's available when you get a quote.
If you're installing solar and a battery together rather than adding a battery to existing panels, our solar and battery package price guide covers combined system prices.
Adding a battery to existing solar: what changes the price?
Your current inverter
If you already have a hybrid inverter that supports batteries, adding one can be fairly straightforward. If you have a standard string inverter, you'll usually need either an AC-coupled battery with its own inverter or a new hybrid inverter. Our solar inverter guide explains the difference.
Battery size
Bigger batteries cost more overall but less per kWh. Because of the tiered rebate, batteries up to about 14kWh tend to offer the best rebate value.
Blackout backup
Not every battery keeps the lights on during a blackout. Backup capability, and how many circuits it covers, can add to the price.
Switchboard and installation
Older switchboards may need upgrading. Indoor vs outdoor placement, long cable runs and wall type can also affect the final price.
Location
Installation costs, state incentives and electricity prices vary across Australia, which changes both the upfront price and how quickly a battery pays for itself.
Are solar batteries worth it?
A battery stores spare solar power from the day so you can use it at night instead of buying expensive grid power. Whether that's worth it depends on your situation.
Recent estimates for a typical home with a 10kWh battery suggest yearly savings of roughly $1,600 to $2,700, depending on the state, when installed alongside new solar. Payback commonly falls somewhere around 6 to 10 years. Adding a battery to an existing system can take longer, often around 7 to 12 years.
Solar batteries tend to make the most sense if:
- You export a lot of solar power during the day for a low feed-in tariff
- You use a lot of electricity in the evening
- You're on a time-of-use plan with pricey evening peak rates
- You want backup power during outages
- You plan to stay in your home for the long term
If you're home all day using solar power directly, or your power bills are already low, a battery may take a long time to pay off. In that case, it may be better to start with cheaper savings first. Our guide on how to lower your power bill has simple ideas to start with.
How long do solar batteries last?
Most home batteries use lithium-ion chemistry, usually lithium iron phosphate (LFP), and come with a warranty of around 10 years. Many warranties guarantee the battery will still hold around 60 to 70% of its original capacity at the end of that period. In real life, a well-installed battery may keep working beyond its warranty, though its storage slowly reduces over time.
When comparing batteries, check the warranty length, the guaranteed capacity at the end, and any limit on total energy throughput. These details can matter more than the brand name.
How to get a fair solar battery quote
- Get at least three quotes from accredited installers.
- Compare usable capacity in kWh, not just the "total" capacity.
- Check what's included, such as a new inverter, backup, monitoring and switchboard work.
- Confirm the rebate amount and that it's already deducted.
- Ask about warranties on the battery, inverter and installation.
- Make sure the battery is on the approved list so you qualify for the rebate.
- Avoid pressure sales, "today only" pricing and promises of zero power bills.
Frequently asked questions
How much is a 10kWh solar battery in Australia?
A 10kWh home battery typically costs around $11,400 installed before rebates, or roughly $8,900 after the federal rebate. Prices vary by brand, installer and location.
What is the average solar battery cost per kWh?
In 2026, installed home batteries usually cost around $800 to $1,300 per kWh before rebates. After the federal rebate, many fall to roughly $650 to $1,100 per kWh, with bigger batteries generally cheaper per kWh.
Can I add a battery to my existing solar system?
Yes. Depending on your current inverter, you may need a hybrid inverter or an AC-coupled battery with its own inverter. An accredited installer can check what will work with your system.
How long does a solar battery take to pay for itself?
Payback is often estimated at around 6 to 10 years when installed with new solar, and around 7 to 12 years when added to an existing system. It depends on your usage, state and electricity plan.
The bottom line
The solar battery price in Australia has come down noticeably, especially with the federal rebate. In 2026, a typical 10kWh battery costs around $8,900 after rebates, though prices range widely by brand and installation. The rebate is at its most generous until the end of 2026 and steps down from January 2027.
Before you buy, look at your evening power use, check whether your inverter is battery-ready and compare at least three detailed quotes. A battery that fits how your household actually uses power is the one that will pay you back.
Prices, savings and rebate figures are general estimates based on 2026 market data and will vary by location, installer and product. This is general information only, not financial advice. Always get quotes from accredited installers and check current rebates with official sources. See our disclaimer for more.
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