Estimate battery size, simple payback and federal battery STC support. Battery economics vary sharply by household, so use your own usage, tariff and quote wherever possible.
Battery size calculator
Estimate nominal battery capacity from night usage and desired coverage.
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Battery payback calculator
Compare battery cost with estimated annual value and simple payback.
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Battery rebate calculator
Estimate federal battery STCs and an indicative certificate value.
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Before choosing a battery
Compare usable capacity, power, efficiency, warranty, backup requirements and how much excess solar is actually available to charge the battery. A larger battery is not automatically a better financial choice.