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To answer this question It must be assumed that this is a three phase motor. There is no listing for a single phase motor which would be in the neighbourhood of 80 amps. That said, the electrical code book rates a three phase 15 HP motor, for calculation purposes, at 460 volts at 21 amps. For an accurate reading use the motor's nameplate amperage reading.

The equation for kilowatts is, kW = Amps x Volts x 1.73 x PF /1000. kW = 21 x 460 x 1.73 x .9 = 15041/1000 = 15.04 kW. PF (power factor) constant used is .9.


Take the kilowatt calculated, times the amount of hours operated will give you kW hours. It is this value that you are charged on from the local utility company. Multiply this value times the charged rate of the utility company per kilowatt hour and you will have your answer.


The utility company's charge rate can be found on your power bill or give them a call to find out what it is.

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