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I have a 1/2HP sump pump rated at 11 Amps running and 43 Amps starting. I would like to buy an emergency portable generator to power it. I know that for 11 Amps I'd need at least 11 x 110 = 1210 Watts, and for 43 Amps = 4730 Watt. Generators also have running/starting watt rating.

So what is my minimum required rating running/starting Amps if I need a generator to power ONLY this pump?

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  • \$\begingroup\$ You seem to have answered your own question: you need a generator with a minimum running current of 11 amperes and a minimum starting current of 43 amperes. To be safe, I would suggest getting a generator with minimum running/starting ratings of 15/50 amperes. \$\endgroup\$ Commented Jun 8, 2014 at 2:01
  • \$\begingroup\$ Amount of flywheel on generator MAY affect capability. If pump starts rapidly motor inertia MAY be enough to supply startup energy. \$\endgroup\$ Commented Jun 8, 2014 at 11:07

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You seem to have answered your own question: you need a generator with a minimum running current of 11 amperes and a minimum starting current of 43 amperes. To be safe, I would suggest getting a generator with minimum running/starting ratings of 15/50 amperes. Assuming a 120 volt system, as implied in your question, the corresponding wattage requirements are 1800/6000.

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