Although diesel generator sets have lower power, they are widely used in mining, railways, field construction sites, road traffic maintenance, as well as factories, enterprises, hospitals and other departments due to their small size, flexibility, lightness, complete supporting facilities, and ease of operation and maintenance. Diesel generator sets are used in places where there is no connection to the grid, or as emergency power sources in the event of grid failures, as well as for more complex applications such as peak tripping, grid support, and grid output.

In the cylinder of the diesel engine, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel injected by the fuel injector. Under the upward compression of the piston, the volume shrinks and the temperature rapidly increases, reaching the ignition point of the diesel. After diesel is ignited, the mixed gas burns violently, expands rapidly, and pushes the piston down. This process is called "doing work". The mechanical energy generated by doing work is transmitted to the generator through the crankshaft. The generator uses the principle of "electromagnetic induction" to output induced electromotive force, which can generate current through a closed load circuit.