How to calculate the efficiency of a generator? Any formulas?
Do you mean a generator as a generator on its own or a generator set, generator plus prime mover? Do you want efficiency over the power range or at a specific point. Easiest way ask the manufacturers.
The efficiency of the generator itself is the kW of electrical power output divided by the kW of mechanical energy applied to the input shaft (typically 90%).
The efficiency of a gen-set is the kW of electrical power output divided by the kW of fuel used to run the prime mover. Typically, small gasoline-powered generators are about 12% efficient, and diesel-powered generators are about 23% efficient. Commercial coal-fired plants can reach 40% efficient.
Also depends on what information you have available to you on its performance.
Separate names with a comma.