Re: Amps To Kilowatts
Most everything that I have read here is calculating KVA, not KW. In a 3 phase system, KVA = Amps * Volts(L-L) * 1.732 (square root of 3)
The difference between KW and KVA is the power factor. In a typical motor that is fully loaded, the power factor will be somewhere in the 80% range. It decreases with load and may be somewhere around 30% in a lightly loaded motor. So:
Assuming a fully loaded 3 phase motor, KW = KVA * 0.80 (power factor). This is the amount of power that is doing useful work. The balance (KVA * 0.20) is called reactive power and is the magnetizing current required by the motor to set up the magnetic circuit inside before it can produce useful work.
Unless you have a meter that reads power factor, you are not being charged for the reactive power.