Hardware tool
Battery Runtime Calculator
Estimate usable battery energy and runtime from voltage, amp-hours, and load.
Runs in your browserResult
- Nominal energy
- 1,200 Wh
- Usable energy
- 864 Wh
- Estimated runtime
- 2.88 h
- Runtime in minutes
- 173 min
Actual runtime varies with discharge rate, battery chemistry, age, temperature, inverter idle draw, and cutoff voltage.
How to use this battery runtime calculator
- Enter the rated capacity or power, expected load, losses, and safety allowance from the equipment labels or plan.
- Review the calculated totals, units, and assumptions. Check the inputs and units before relying on the result.
- Change one input at a time to compare another case, then copy or save the result you plan to use.
About this battery runtime calculator
Use the Battery Runtime Calculator to estimate usable battery energy and runtime from voltage, amp-hours, and load. The result changes when you adjust the values or options above.
You can also use it to compare results after changing one input.
Example
Enter battery voltage and capacity with a 300-watt load, then account for usable capacity and efficiency for a more realistic runtime estimate.
Common uses
- → estimate usable battery energy and runtime from voltage, amp-hours, and load
- → compare results after changing one input
- → save an estimate for planning or comparison