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What size generator or power station for a central air conditioner? (4,400+ W)
To run a central air conditioner, choose at least
4,400 W running · 6,000 W startup surge.
4,400 W running · 6,000 W startup surge.
A central air conditioner draws about 3,500 W while running, but its motor can spike to roughly 6,000 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 4 min |
| 500 Wh | 0 h 7 min |
| 1,000 Wh | 0 h 15 min |
| 2,000 Wh | 0 h 29 min |
| 3,000 Wh | 0 h 44 min |
Sizing guide
| Minimum running watts | 4,400 W |
| Minimum starting watts | 6,000 W |
| Suggested inverter | 6,000 W or higher |
See also central air conditioner wattage and running cost.
FAQ
How many watts does central AC use?
A typical central AC draws 3000-5000 watts, with a higher surge when the compressor starts.
How can I lower AC costs?
Raise the thermostat a few degrees, seal leaks and service the unit so it runs efficiently.
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