Calculator
Battery Backup Runtime Calculator
Accuracy note: The arithmetic on this page is deterministic from your inputs. Solar production, code, utility, incentive, and savings outputs are estimates unless you supply exact equipment specs, tariffs, shade data, and local requirements.
Inputs
Result
How this is calculated
Load kWh = watts × hours ÷ 1000. Usable AC kWh = battery kWh × DoD × inverter efficiency. Runtime = usable AC kWh ÷ load kW.