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1 HP = 746 watts therefore, 3 HP = 3 x 746 watts ... get out your calculator or "guesstimate" like me and say ~2250 watts or 2.3 Kilowatts.

The above answer will give you the output, but for input power you have to divide by the efficiency factor (generally in the range of 0.7 to 0.9), so the input power required will be closer to 3.0 Kilowatts.

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