Generator Wattage Calculator (Starting Watts)
Many motor-driven appliances draw more power for a few seconds when they start.
Use this calculator to add up running and starting watts across several loads so you can pick a generator that can handle the combined surge.
Starting vs running watts
List a few appliances and compare total running watts to estimated starting (surge) watts.
Enter up to five appliances. If you do not know starting watts, the calculator can assume about 2× running watts as a rough default.
For more planning tools, you can also use the other calculators and guides on the GeneratorCalc home page.
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