A home battery is worth it if you use a lot of electricity in the evening and your feed-in tariff is low, which describes most Australian households in 2026. A 10kWh battery costs roughly $9,000 to $11,000 installed after the federal rebate, and a realistic payback sits somewhere between 6 and 13 years depending on how much of the stored energy you actually use each night, whether you join a virtual power plant, and what tariff you are on.
The short version
- A 10kWh battery costs roughly $9,000 to $11,000 installed after the federal rebate, a 13kWh battery roughly $11,000 to $13,000.
- Feed-in tariffs of 2 to 8 cents per kWh versus retail rates of 29 to 45 cents mean self-consumed power is worth roughly 6 times more than exported power.
- Realistic payback is 6 to 13 years, shorter for heavy evening users and VPP participants, longer for light users.
- Households on a legacy high feed-in tariff, or with low evening usage, often see a much weaker case.
- Buying now captures a larger rebate than buying later, since the federal discount shrinks on a fixed schedule to 2030.
Installed cost by usable capacity, rebate applied
- 10kWh: $9,084 ($908 per kWh) battery alone, or $10,784 ($1,078 per kWh) including a new inverter.
- 13kWh: $11,029 ($848 per kWh) battery alone, or $13,109 ($1,008 per kWh) including a new inverter.
- 15kWh: $12,377 ($825 per kWh) battery alone, or $14,177 ($945 per kWh) including a new inverter.
Why the maths works the way it does
The whole case for a battery comes down to one spread: feed-in tariffs are currently around 2 to 8 cents per kWh in most states, while retail electricity is around 29 to 45 cents per kWh. Every kWh you store and use yourself instead of exporting it is worth roughly six times what the same kWh earns you as an export. A battery is essentially a way to buy that spread back, at the cost of the hardware.
A worked example
Take a 13kWh battery and inverter installed for about $13,000 after the federal rebate. If it cycles about 85 percent of its usable capacity most nights, that is roughly 11kWh shifted from expensive evening grid import to stored solar. At a net benefit of about 25 cents per kWh (roughly 30 cents saved on import, minus about 5 cents in export income given up), that is close to $2.75 a day, or about $1,000 a year. On that basis alone, payback lands around 13 years, the conservative end of the range. Add virtual power plant payments, commonly $200 to $600 a year, or a household with genuinely heavy evening use, and payback compresses toward 6 to 9 years, which is the band most Australian solar industry sources currently quote.
When a battery does not pay off quickly
Four situations stretch payback well past that range. Households still on an old, generous feed-in tariff from the early 2010s, sometimes 40 cents per kWh or higher, are often better off exporting than storing, since the spread the battery is trying to capture barely exists for them. Households with low evening usage, because they already run appliances during the day, have little load left for a battery to serve. Oversizing the battery beyond what your solar system can reliably refill each day extends payback rather than shortening it, batteries above about 15kWh are wasted on a home without an EV or heavy evening loads. Finally, if blackout protection is not a priority and you are on a flat tariff, the "insurance" value some buyers place on a battery is not backed by a financial return.
What speeds up the payback
Three things reliably move a battery from marginal to clearly worthwhile. Joining a virtual power plant so the retailer dispatches your stored solar into the evening peak in exchange for a payment, on top of your own self-consumption savings. Charging an EV, which soaks up daytime solar and creates a genuinely large evening load for the battery to cover. And buying at the right time, since the federal rebate is worth more today than it will be in a year, on its published downward schedule to 2030.
What to check before buying
Confirm the battery and inverter are on the Clean Energy Council approved products list, since only approved gear qualifies for the federal rebate. Get at least two quotes and compare the cost per kWh of usable capacity, not just the headline system price, since a bigger battery with a lower per kWh rate can still be the worse buy if it is oversized for your home. Ask whether the quote already has the rebate applied or whether it is a separate deduction, and confirm your inverter is VPP capable if you plan to join a virtual power plant later, since retrofitting that capability can be costly.
The honest bottom line
For a typical household with solar, moderate to heavy evening electricity use, and access to the current federal rebate, a battery is a reasonable investment with a payback inside the life of the equipment, usually rated for 10 years or more. For a household with low usage or a legacy high feed-in tariff, the numbers are much weaker, and the honest answer is to run your own numbers on your actual bills before buying, not the marketing brochure's.
Compare batteries with AUD pricing on the WattsUp Find and Compare directory. Check the current rebate first in our Cheaper Home Batteries rebate guide, and see why export rates are so low in our feed in tariffs guide.
Frequently asked questions
How much does a 10kWh home battery cost in 2026?
Roughly $9,084 for the battery alone, or $10,784 including a new inverter, installed and with the federal rebate already applied.
What is the payback period for a home battery?
Realistically 6 to 13 years, depending on how much of the stored energy you use each night, whether you join a virtual power plant, and your feed-in tariff. Heavy evening users with VPP payments land at the shorter end.
Is a battery worth it if I have a high feed-in tariff?
Often not. If you are still on a legacy tariff from the early 2010s paying 40 cents per kWh or more for exported power, exporting can be more valuable than storing, and a battery may not pay for itself quickly.
Does a bigger battery pay back faster?
Not necessarily. A battery sized beyond what your solar system and evening usage can reliably fill and empty each day extends payback rather than shortening it. Match battery size to your actual night time usage.
Does joining a virtual power plant help?
Yes. VPP payments of roughly $200 to $600 a year on top of self-consumption savings are one of the more reliable ways to shorten payback, since the retailer pays you to dispatch stored energy at high value times.