Generator Size Calculator
Full version ↗
Refrigerator
No
Yes (700W run / 2200W start)
Sump Pump
No
Yes (800W run / 1300W start)
Gas Furnace Fan
No
Yes (700W run / 2350W start)
Lights & Chargers
Minimal (300W)
Moderate (600W)
Full house (1200W)
Well Pump
No
Yes (1000W run / 2000W start)
Window AC / Space Heater
No
Window AC (1200W run / 1800W start)
Space heater (1500W)
Calculate
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Minimum Generator Size
Total Running Watts
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Highest Starting Load
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