Solar Battery Payback Calculator
Estimate annual delivered battery energy, avoided grid cost, net annual savings and simple payback from battery capacity, cycling and electricity values.
Default project preview
13.5 years
Delivered energy per cycle
11.18 kWh
Annual delivered energy
3,353 kWh
Avoided grid value
$1,073.09
Charging energy value
$291.60
Calculator
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Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Annual delivered energy = capacity × usable share × efficiency × cycles. Net savings = avoided grid value − charging-energy value − maintenance. Payback = installed cost ÷ net savings.
FAQ
Solar Battery Payback Calculator questions
Why assign a value to solar charging energy?+
Energy used to charge a battery may otherwise have been exported or used directly, so it can have an opportunity cost.
Does backup power value appear in payback?+
No. Reliability and outage resilience are personal or business values not included in the simple energy calculation.
Will battery degradation change payback?+
Yes. Declining usable capacity reduces delivered energy over time.