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How big a generator do I need to run a sump pump?

The larger the generator you will need, the higher the power of the sump pump. A 13 horsepower sump pump will have an average starting wattage of 1300 watt and an average running wattage of 800 watt. You can expect a starting wattage of 2150 and a running wattage of 1050 for 12 horsepower models.

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