How to estimate of fuel consumption? Based on the calculation of the total power load, we can estimate fuel consumption for generator set. By these calculations we can see on fuel consumption of gasoline-driven generator set compared to diesel-driven generator set.

**Specific Fuel Consumption (SFC)**

Specific
Fuel Consumption of a generator, based on the amount of fuel consumption
divided by the motor output power. In calculating the estimates made here, the motor output
power (brake horsepower, flywheel horsepower) is considered equal to the power
consumed (load power), efficiency factors are not calculated.

If not written on the generator manufacturer's specifications, we can use the following SFC data.

Otto (gasoline) engine: 273-227 g/kw/hr, the average value = 250 g/kw/hr

Diesel engine: 209-178 g/kw/hr, the average value = 194 g/kw/hr

http://en.wikipedia.org/wiki/Brake_specific_fuel_consumption

If not written on the generator manufacturer's specifications, we can use the following SFC data.

Otto (gasoline) engine: 273-227 g/kw/hr, the average value = 250 g/kw/hr

Diesel engine: 209-178 g/kw/hr, the average value = 194 g/kw/hr

http://en.wikipedia.org/wiki/Brake_specific_fuel_consumption

**Fuel density**
The
density of fuel depends on the temperature and its contents, can generally be
taken as the average value as belows by wikipedia:

Gasoline 0.745 kg/l

Diesel fuel
0.832 kg/l

**Calculation**

If
the electrical load is 10,000 watts or 10KW, and used continuously for 24 hours
a day. Please note the unit measurement of power, if using kva then it needs to be multiplied by power factor to get the power in watts. Then based on the average value of Specific Fuel
Consumption, fuel consumption is:

For gasoline motor generator: 250 x 10 x 24 = 60 000 g/day = 60 kg/day

If the specific gravity of gasoline is 0.745 kg/l, then consumption in liters is:

60 / 0.745 = 80.54 liters per day

For diesel motor generator: 194 x 10 x 24 = 46 560 g/day = 46.56 kg/day

If the specific gravity of diesel fuel is 0.832 kg/l, so fuel consumption in liters is:

For diesel motor generator: 194 x 10 x 24 = 46 560 g/day = 46.56 kg/day

If the specific gravity of diesel fuel is 0.832 kg/l, so fuel consumption in liters is:

46.56 / 0.832
= 55.96 liters per day

These
calculations show that the diesel motor generator has much better fuel
efficient. Gasoline motor
generator consumes 44% more fuel. But of
course must also consider the price of fuel where generator works.

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