# useful power calculations and information

## Generator Fuel Consumption

This chart approximates the fuel consumption of a diesel generator based on the size of the generator and the load at which the generator is operating at.

Please keep in mind that this chart is intended to be used as an estimate only as various factors will increase or decrease actual fuel consumption.

Generator Size (kW) 25% load (L/Hr) 50% load (L/Hr) 75% load (L/Hr) 100% load (L/Hr)
20 2.7 3.4 4.9 6.1
30 4.9 6.8 9.1 11
40 6.1 8.7 12.1 15.2
60 6.8 11 14.4 18.2
75 9.1 12.9 17.5 24
100 9.9 15.6 22 28.5
125 11.8 18.9 26.9 34.5
135 12.5 20.5 28.8 38
150 13.7 22.4 31.8 41.3
175 15.6 25.8 36.8 49
200 17.8 29.2 41.7 54.6
230 20.2 33.4 47.4 62.9
250 21.6 36 51.5 68.2
300 25.8 42.8 60.1 81.4
350 29.9 49.6 70.8 95.1
400 33.7 56.5 81 108.3
500 41.7 70.1 100 135.2
600 50 83.3 119.3 162.1
750 162.1 103.8 148.8 202.2
1000 81.8 137.8 197.3 269.2
1250 101.8 171.5 246.1 336.2
1500 121.9 205.6 294.6 403.2
1750 142 239.2 343.4 470.2
2000 162.1 273.3 391.8 537.2
2250 182.1 307 440.7 604.2

## AC/DC Formulas

E = Voltage I= Amps W = Watts PF = Power Factor
Eff = Efficiency HP = Horsepower

To Find Direct Current AC / 1phase
115v or 120v
AC / 1phase 208,230, or 240v AC 3 phase All Voltages
Amps when Horsepower is Known
HP x 746
E x Eff
HP x 746
E x Eff X PF
HP x 746
E x Eff x PF
HP x 746
1.73 x E x Eff x PF
Amps when Kilowatts is known
kW x 1000
E
kW x 1000
E x PF
kW x 1000
E x PF
kW x 1000
1.73 x E x PF
Amps when kVA is known
kVA x 1000
E
kVA x 1000
E
kVA x 1000
1.73 x E
Kilowatts
I x E
1000
I x E x PF
1000
I x E x PF
1000
I x E x 1.73 PF
1000
Kilovolt-Amps
I x E
1000
I x E
1000
I x E x 1.73
1000
Horsepower (output)
I x E x Eff
746
I x E x Eff x PF
746
I x E x Eff x PF
746
I x E x Eff x 1.73 x PF
746

## AC Efficiency and Power Factor Formulas

E = Voltage I= Amps W = Watts PF = Power Factor
Eff = Efficiency HP = Horsepower

To Find Single Phase Three Phase
Efficiency
746 x HP
E x I x PF
746 x HP
E x I x PF x 1.732
Power Factor
Input Watts
V x A
Input Watts
E x I x 1.732