Throughout the world, diesel or gasoline generators are used when electricity is needed and no grid connection is available. Outside of cities, at construction sites, at outdoor events in the open or in the exploration of oil and gas. In all of these applications, very heterogeneously electric power is required. The load varies from 100% to a few percent during the night or periods of rest. Unfortunately, diesel generators have at loads below 50% a very poor efficiency. Less than 30% capacity, the service life of the generator is even significantly reduced because soot particles are settled in the oil and the cylinders which can destroy the engine. To avoid this, load resistors are often connected to the generator at 30% part load.