What size generator is needed to run a 6HP compressor at 230V?

The electrical code book states that a single phase 3 HP motor at 230 volts draws 17 amps. This equates to 3910 watts. Allowing for starting inrush current a 5000 watt generator will run the motor but the generator will labor a bit until the motor gets up to speed. Generators with a higher wattage rating would have less trouble with the starting of the 3 horse power motor.

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One hp is 746 watts. 3*746=2238. It takes 3 to 6 times as much energy to start as it does to run.