Battery Size Calculator
Find the right battery size for your home based on usage patterns and solar system.
Your details
Our recommendation
13.5kWh
Battery
- After federal rebate
- $11,542
- Backup duration
- 8 to 12 hours
The federal battery rebate on a 13.5kWh battery is about $3,458. See the rebate for your home, then one Why Solar Approved installer sends one free written quote, and a solar expert spends fifteen minutes going through it with you before you sign.
See your battery rebate and get one written quoteEstimated savings
- Evening and night usage
- 11.3 kWh
- Daily excess solar
- 16.0 kWh
- Battery utilisation
- 100%
- Annual savings
- $1,478
- Payback period
- 7.8 years
All battery options
Installed price after the federal rebate, with the price before it struck through.
These estimates are indicative only. Prices are typical installed prices less the federal battery rebate; state schemes are not included. Battery savings depend on your specific usage patterns, time-of-use tariffs, and installation specifics.
One battery quote, checked before you sign
One Why Solar Approved installer looks at your home and sends one free written quote for the battery that suits it. Before you sign, a solar expert goes through it with you, line by line.
Get one battery quoteHow this battery calculator works
This calculator helps you find the right battery size based on your household usage, existing solar system, and backup requirements. It factors in your grid tariff, feed-in rate, and the federal battery rebate to estimate payback period and annual savings.
Battery savings come from storing cheap solar energy during the day and using it in the evening instead of buying expensive grid power. The difference between your grid tariff (typically 28 to 42c/kWh) and feed-in tariff (typically 3 to 10c/kWh) determines how much each stored kilowatt-hour saves you.
