Answer: The method to determine the real useful power of the unit is: multiply the rated power of the diesel engine for 12 hours by 0.9 to obtain a data (kw). If the rated power of the generator is less than or equal to the data, the rated power of the generator is determined as the real useful power of the unit. If the rated power of the generator is greater than this data, this data must be used as the real useful power of the unit
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