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What Is Overload in Diesel Generator?

All electric generators   have a maximum capacity based on two things—the capacity to generate electricity, and the engine that drives that generator. The greater the load, the more work the engine must do. 1 horsepower is about equivalent to 746 watts. If your motor is capable of one horsepower, the maximum power you can generate is 1 horsepower minus the mechanical losses of turning the generating unit. Generators are protected by circuit breakers that allow a few seconds of very high current, but will trip if the current stays high for too long. This “surge” allows the generator to start motors which require higher current to go from Zero RPMs to running speed. The main breaker is sized in accordance with the generator’s ability to produce current without burning itself up. Example A Kubota Diesel Generator rated at 12,000 watts (12 kilowatts) has a surge capacity of 14 kilowatts. It is powered by a Kubota D902 3-cylinder diesel engine rated at 20.4 hor...