How Is the Efficiency of a Generator Calculated?

[Sai Kiran Aka]

How to calculate the efficiency of a generator? Any formulas?

 

[Jobrag]

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.

 

[insightful]

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.

 

[russ_watters]

Also depends on what information you have available to you on its performance.