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Efficiency of a generator

  1. Jun 26, 2015 #1
    How to calculate the efficiency of a generator? Any formulas?
  2. jcsd
  3. Jun 26, 2015 #2
    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.
  4. Jun 26, 2015 #3
    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.
  5. Jun 26, 2015 #4


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    Staff: Mentor

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