Patent ID: 7576449

Claim:
A method of converting direct voltage generated by a mains connected system for decentralized power supply into a three-phase alternating voltage by means of a plurality of single-phase inverters (WR 1 -WR 3 ) connected to a different phase (L 1 , L 2 , L 3 ), said alternating voltage being provided for supplying an electric mains and for decentralized power supply, whereby upon failure of one inverter (WR 1 -WR 3 ), an asymmetrical power supply distribution is reduced by limiting the output of the other inverters, whereby the failure of the inverter (WR 1 -WR 3 ) is registered by a measurement signal of an additional circuit of the inverter, a communication signal resulting from the measurement signal being provided for limiting the output or for disconnecting the inverters from the mains, whereby the measurement signal is generated by a current of a constant current source, said current of said constant current source being in the milliampere range.