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Answer Generators usually always go by watts. To figure this all you do is take

(volts x Amps) = watts. You know the volts (220) then look on the pump for the amp rating and then multiply them and you will have your watts. Then get a generator that is rated for this amount for continuos operation not peak watts. Hope this helps.

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Q: What size generator to power 220 volt three quarter horsepower well pump?
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