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
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 
KilovoltAmps 
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
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 