How long will your battery last?
Select a power station, add the devices you want to run, and get an estimated runtime based on real capacity and inverter efficiency. Adjust the efficiency slider if you want a more conservative or optimistic estimate.
Runtime Calculator
Select a power station and add devices to estimate how long your battery will last.
Devices
No devices added yet. Add one below.
Accounts for energy lost during DC→AC conversion. Default 85% is a safe estimate.
Estimated Runtime
Add devices on the left to see your runtime estimate.
How this works
Real capacity data
Specs come directly from the manufacturer. We use the rated watt-hours, which is what's actually in the battery.
Inverter efficiency
When a battery converts DC to AC power, some energy is lost. Default 85% is a reasonable real-world estimate. LiFePO4 batteries often hit 90%+.
The formula
(Capacity × Efficiency) ÷ Total Watts = Hours. Simple, honest, no padding.
Keep in mind
Device wattage can vary. A mini fridge draws 60W when the compressor runs, but cycles off and on — average draw over time is much lower. For intermittent devices, consider cutting their wattage in half for a more realistic estimate. Temperature, battery age, and load mix also affect real-world runtime.
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