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What size generator or power station for a space heater? (1,900+ W)
To run a space heater, choose at least
1,900 W running.
1,900 W running.
A space heater draws about 1,500 W while running. Pick a generator, inverter or power station rated comfortably above these numbers.
Battery runtime calculator
Estimated runtime—
Assumes about 85% usable capacity. Motors need extra headroom for startup surge.
How long a power station lasts
| Power station | Estimated runtime |
|---|---|
| 300 Wh | 0 h 10 min |
| 500 Wh | 0 h 17 min |
| 1,000 Wh | 0 h 34 min |
| 2,000 Wh | 1 h 8 min |
| 3,000 Wh | 1 h 42 min |
Sizing guide
| Minimum running watts | 1,900 W |
| Minimum starting watts | 1,900 W |
| Suggested inverter | 1,900 W or higher |
See also space heater wattage and running cost.
FAQ
How many watts does a space heater use?
Most plug-in space heaters draw 750-1500 watts on full heat.
Are space heaters expensive to run?
Yes - at 1500 W and average rates, a few hours a day adds up to real money over a winter.
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