A diesel engine drives a generator. The diesel engine power selection principle is the rated power of the generator plus the power of auxiliary devices other than the rated shaft output power of the diesel engine (such as cooling fans, cooling water pumps ). , lubricating oil or cooling pounds, electric heating, etc.) and loss of power of the coupling.
The 40KW generator is relatively small and does not have many auxiliary devices, so only the cooling fan and coupling losses can be considered. 42KW is enough.