### Generator Sizing Calculation Guide Grainger Knowhow

The next item to look at for generator sizing is the volt-amperes wattage requirement of electric motor to be operated e.g., furnace blower motor 13 HP, remembering that the starting requires 2 to 3 times the nameplate or running rated watts. Thus, if running watts of the motor is 600, multiply the number by 3 to determine approximate max.

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