USEFUL FORMULAS TO OBTAIN: SINGLE-PHASE AC POWER THREE-PHASE AC POWER kilowatts (kW) Volts x Amps x PF1000 Volts x Amps x PF x 1.7321000 kVA Volts x Amps1000 Volts x Amps x 1.7321000 Amps (kVA unknown) kW x 1000Volts x PF kW x 1000Volts x PF x 1.732 Amps (kW unknown) kVA x 1000Volts kVA x 1000Volts x 1.732 Frequency (Hertz) # poles x rpm120 # poles x rpm120 Horsepower required to drive a generator kW       0.746 x Generator Efficiency kW       0.746 x Generator Efficiency Reactive KVA (KVAR) V x I x I - (P.F.)1000 1.732 x V x I x I - (P.F.)1000

"PF" refers to power factor, which is expressed as a decimal fraction. For example, 80% power factor = 0.8 for the purposes of calculations. In general, single-phase generator sets are rated at 100% power factor and three-phase generator sets at 80% power factor.

"Volts" refers to line-to-line voltage.

"Amps" refers to line current in amperes.

"F" refers to frequency. 0% frequency regulation is defined as isochronous.

 V = Voltage I = Amps P.F. = Power Factor

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