Multiply the watts by the hours, then divide by 0.85 for the power lost turning battery power into AC. That gives the smallest station, in watt-hours, by the factor Jackery, EcoFlow and Anker SOLIX each use.
For several things at once, type a sum, such as 60 + 10.
Power station size
60 W × 8 h = 480 Wh used. 480 Wh ÷ 0.85 = 565 Wh. By Jackery’s, EcoFlow’s and Anker SOLIX’s factor, a station listed at 1,000 Wh covers it.
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Why divide by 0.85
A station stores power as DC, and its inverter turns it into the AC your plugs use. EcoFlow says that step always loses a little, typically 10 to 20%, so a 1,000 Wh battery may supply only about 800 to 900 Wh of AC power.
Where the makers differ
| Maker | Factor | Where it’s given |
|---|---|---|
| Jackery | 0.85 | Explorer 300 page |
| EcoFlow | 0.85 | Blog, “for a conservative estimate” |
| Anker SOLIX | 0.85 | Runtime and sizing blog posts |
| BLUETTI | 0.9 × 0.85, plus about 15 W | AC180 page: its depth of discharge, inverter and own use |
| BLUETTI | 0.8 | Starlink guide, for AC loads |
Bluetti says its AC180 formula isn’t suitable for loads with compressors, such as fridges and air conditioners. Anker SOLIX adds a 20% margin to the day’s total for appliances with motors, which need extra power just to start.
Watt-hours and watts are two different limits
Watt-hours tell you how long a station lasts. Watts tell you how much it can power at once. Jackery’s Explorer 300 shuts off if the total on its AC outlets goes over 300 W, however much charge is left.
EcoFlow describes two ratings: a continuous one for steady running, and a surge capacity that handles a short spike above it. Anker SOLIX names fridges, power tools, pumps and portable coolers as loads with startup surges.
If you run an extension cord from the station, check its gauge with What Bulb For’s cord gauge chart.