Is a home battery worth it for you?
Free and independent. Answer six quick questions and your payback estimate updates instantly, with no email required.
Enter a 4-digit postcode to begin.
Your average bill per quarter, including supply charges.
A battery only earns its keep on the power you use after the sun goes down.
The federal discount applies from 5 kWh of usable capacity.
Cheap overnight rates matter most if you don't have solar to charge from.
Enter your details to see your estimate
Start with your postcode, then your solar, battery size and tariff.
How the maths works
A battery doesn't make energy; it moves it. We work out how much power you use after dark, how much spare solar (or cheap overnight power) you have to store, and value each stored kilowatt-hour at the grid price you avoid minus what it cost you to charge.
What the federal discount is worth
The Cheaper Home Batteries Program takes roughly 25–30% off the installed price. From 1 May 2026 it pays about $252 per kWh for the first 14 kWh of usable capacity and $151 per kWh from 14 to 28 kWh, with a 5 kWh minimum. State and territory schemes may reduce your cost further; ask your installer what applies where you live.
Why a battery needs solar
Without solar you're buying power to store it, so your saving is only the gap between peak and off-peak rates. With solar you're storing energy that would otherwise export for a few cents, which is why payback is usually years shorter for solar homes.
Last updated: September 2026.