How long will a power station last?
Enter the average watts you'll draw. You get runtime for any battery size, plus all 19 verified models whose continuous output can carry that load.
| Model | Wh | AC continuous W | Runtime |
|---|
The math
Runtime (h) = Wh × efficiency ÷ load W. Example: 2,042 Wh × 0.85 ÷ 300 W = 5.8 h. Use average watts. For cycling appliances (fridges, pumps, blowers), see the full calculator or our fridge, sump pump and furnace guides. This page doesn't check surge; motor loads need the full calculator.
85% efficiency is a planning assumption, not a measured figure. Specs come from manufacturer pages (comparison table).
FAQ
How do I calculate power station runtime?
Runtime (hours) = rated battery Wh × inverter efficiency ÷ average load in watts. With 85% efficiency, a 1,024 Wh station running a 100 W load lasts about 8.7 hours.
Why is real runtime shorter than Wh ÷ watts?
Converting battery DC to AC loses energy, the station uses some power itself, and cold temperatures reduce usable capacity. That's why we apply an editable efficiency factor (85% default, a planning assumption).