Generator Wattage Calculator

Your details

Steady-state power while the appliance is running (also called rated watts).
W
Extra surge power drawn for 1-2 seconds on startup. Same as running if no motor.
W
Steady-state power while the appliance is running.
W
Peak startup watts for appliance 2 (leave as running watts if no motor).
W
Steady-state power while the appliance is running.
W
Peak startup watts for appliance 3.
W
Steady-state power while the appliance is running.
W
Peak startup watts for appliance 4.
W
Steady-state power while the appliance is running (0 = unused slot).
W
Peak startup watts for appliance 5.
W
Generators lose about 3% of their rated output for every 1,000 ft above sea level. Enter 0 if at or near sea level.
ft
Running a generator at 100% load shortens its life. A 20% headroom means your peak load uses only 80% of rated capacity.
Recommended Generator SizeMid-size portable
4,176W

Peak demand plus safety headroom, adjusted for altitude

Total Running Watts2,080W
Peak Starting Demand3,480W
Recommended Size (kW)4.18kW
Largest Motor Surge1,400W
Running Watts2,080
Startup Surge1,400
Generator Size Needed4,176

You need a generator rated at least 4.2 kW (4,176 W).

  • Your appliances draw 2,080 W running, with a peak startup demand of 3,480 W.
  • The biggest motor surge adds 1,400 W for 1-2 seconds on startup. A generator rated below 3,480 W will stall or trip when that appliance starts.
  • Look for a generator with at least 4,176 rated watts. Go one commercial size tier up to give your engine the headroom it needs for long run times.

Next stepA portable inverter generator in this range is quiet enough for camping or tailgating and safe for sensitive electronics.

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