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What size generator or power station for a heat pump? (3,750+ W)
To run a heat pump, choose at least
3,750 W running · 5,000 W startup surge.
3,750 W running · 5,000 W startup surge.
A heat pump draws about 3,000 W while running, but its motor can spike to roughly 5,000 W at startup, so size for the surge. 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 5 min |
| 500 Wh | 0 h 9 min |
| 1,000 Wh | 0 h 17 min |
| 2,000 Wh | 0 h 34 min |
| 3,000 Wh | 0 h 51 min |
Sizing guide
| Minimum running watts | 3,750 W |
| Minimum starting watts | 5,000 W |
| Suggested inverter | 5,000 W or higher |
See also heat pump wattage and running cost.
FAQ
How many watts does a heat pump use?
Typically 1500-5000 watts while running, with a surge at compressor startup.
Why is a heat pump efficient?
It transfers existing heat rather than generating it, so each watt does more work.
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