Power Calculators


Available Power Calculations
Use this to calculate how many amps you can get out of a given size generator.
HP required assumes generator efficiency of 0.8


Enter
Voltage
P.F.
Phase
V
Single Three
Enter
kW
 
KVA
 
Engine HP
 
PTO HP
OR
OR
OR
To Find Amperage
 

Required Power Calculations
Use this to calculate what size generator you need by entering the voltage and amperage required. HP required assumes generator efficiency of 0.8

Enter
Voltage
Amps
P.F.
Phase
V
A
Single
Three
To Find
Watts
VA
Engine HP
PTO HP

Rule of Thumb for Quick Amp Calculation
480 Volt 3 ph: kW * 1.5 = Amps @ 0.80 PF
240 Volt 3 ph: kW * 3.0 = Amps @ 0.80 PF
208 Volt 3 ph: kW * 3.5 = Amps @ 0.80 PF
240 Volt 1 ph: kW * 4.0 = Amps @ 1.0 PF

Miscellaneous Conversions
1 Btu = 252 calories
3412 Btu = 1 kWh
2544 Btu/hr = 1 HP
BMEP = (HP * 792,000) / (RPM * disp in3)