The three ways a diesel generator engine can be used is continuous, standby and prime. The first one is for permanent use. Prime mode is for when the engine is used for only a couple of hours a day with more power. Standby emergency mode can be supported only 25 hours a year with maximum power. Elitech power Generation supplies engines from Doosan, Cummins, Volvo Penta and Perkins manufacturers. The links to these companies are as follows :