An inverter (3) is described for feeding electrical energy into a power supply system (2) having in each case one input (6, 7) which is intended for connection to the negative and positive output (4, 5) respectively of a DC voltage generator (1) two outputs (8, 9) which are intended for connection to the power supply system (2), and a device, which has a strong inductor (L1) and switches (S1 to S6), for conversion of a DC voltage to an AC voltage. The input (7) which can be connected to the negative output (5) of the DC voltage generator (1) can be grounded, and at least one of the two outputs (8, 9) is provided with a mains inductor (L2). According the invention, the device contains a bridge circuit with two current paths (S4, L1, S6; S5, L1, S3) of which the one provides positive and the other negative output currents, a switching unit for switching, which is carried out at the power supply frequency, between the two current paths (S4, L1, S6; S5, L1, S3) and a coupling capacitor (1) which connects the bridge circuit to the switching unit.