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Get Battery Quotesarrow_forwardHow 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 available state rebates 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 28-42c/kWh) and feed-in tariff (typically 3-10c/kWh) determines how much each stored kilowatt-hour saves you.
Common Questions
What size battery do I need for my home?
Most Australian homes do well with a 10-13.5kWh battery, which covers evening and overnight usage for a typical 3-4 person household. If you have high evening usage (ducted AC, EV charging, pool pump), consider 15-20kWh. A 5kWh battery suits smaller homes or apartments.
How long does a solar battery take to pay for itself?
Battery payback periods in Australia typically range from 7 to 12 years, depending on your electricity rate, self-consumption increase, and whether you access state rebates. States with high electricity prices (SA, NSW) and battery rebates (VIC, ACT) see the fastest payback.
Are solar batteries worth it in Australia in 2026?
Batteries make financial sense if you have high evening usage, low feed-in tariffs (under 5c/kWh), time-of-use pricing, or access to state rebates. They also provide backup power during outages. If your feed-in tariff is above 8c/kWh and you are rarely home in the evening, a battery may not pay back within its warranty period.