Abstract: In a power supply system comprising an electric generator, a DC intermediate circuit, at least one rechargeable electrical energy storage, which is connected to the DC intermediate circuit, a rectifier via which the electrical generator is connectable to the DC intermediate circuit, and at least a first inverter, the DC side of which is supplied with direct current from the DC intermediate circuit and the AC side of which is connectable to an electrical load, and further comprising a control device which regulates the generator in dependence on the load of the electrical load, it is provided that the control device is designed to switch between a first and a second operating mode of the power supply system, wherein in the first operating mode the electrical energy generated by the electrical generator is supplied via the rectifier to the DC intermediate circuit, and in the second operating mode the generator is connected to the load in parallel with the inverter.