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Runtime calculator

How long will your battery last?

Edit every assumption, see usable energy, and plan with a conservative estimate.

Usable Wh รท average W= estimated hours

Enter your power needs

Start with the battery capacity and the appliance's running wattage.

Adjust assumptions
Estimated runtime7.7 hours

Under the assumptions shown below.

Conservative estimate
6.5 hours
Usable battery energy
765 Wh
Average appliance load
100 W
This is an estimate.

Temperature, battery condition, inverter losses, and appliance behavior affect actual runtime.

    What this calculator includes

    Rated capacity, inverter efficiency, battery reserve, appliance running watts, and optional duty cycle.

    What it cannot predict

    Startup compatibility, temperature effects, battery aging, firmware behavior, and exact appliance cycling.

    Review the formula, examples, and limitations before using the result for outage planning.

    Read the calculation method