How to use the runtime calculator
- Pick your power station, or choose Custom and type its capacity (Wh) and AC output (W).
- Choose AC outlets or DC/USB, depending on how your devices connect.
- Add each appliance. We fill in a typical average wattage. If you know your appliance's real number, type it in.
- Read the runtime, and check for warnings about output or startup surge.
The formula
A 1,024 Wh station running 120 W of appliances lasts about 1,024 × 0.85 ÷ 120 ≈ 7.3 hours. The full explanation, including amp-hours and why real runtime can be shorter, is in how to calculate power station runtime.
Average watts vs. running watts
A refrigerator might draw 150 W when the compressor is on, but it's only on part of the time, so over a day it averages around 60 W. Battery runtime depends on the average, while what the station can start depends on running and surge watts. This calculator tracks both, so it can tell you a station will last 14 hours with your fridge, and also whether it can start the fridge at all.