Fans can be useful outage loads because many use much less power than air conditioning, but runtime depends on fan wattage and battery capacity.
Fan speed changes consumption, so use the setting you expect to run. A watt meter can give a better planning number than a generic estimate.
Usable battery watt-hours divided by average fan watts gives an approximate runtime. Account for inverter losses and reserve.
Enter battery capacity and average device load. This planning estimate uses 85% usable efficiency.
Actual runtime varies with conversion losses, cycling loads, temperature and battery condition.
Continue with the Power Guides & Resources hub for related runtime, appliance-sizing and solar-planning articles.
Use your estimate above to compare current portable-power options. Start with the closest capacity or solar setup for your needs:
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