Patent ID: 8179000

Claim:
A method for operating a photovoltaic system having a plurality of photovoltaic modules, two DC motors separately connectable to the photovoltaic modules, and a three-phase generator connectable to a power grid, comprising the steps of: in an operating state of the photovoltaic system, supplying electric energy from a first group of the photovoltaic modules to a first of the two DC motors and supplying electric energy from a second group of the photovoltaic modules to the second DC motor; thereafter in a first step, supplying electric energy from both the first group and the second group of the photovoltaic modules exclusively to the first DC motor; in a second step, supplying electric energy from a battery to the second DC motor; and in a third step, exciting the second DC motor such that the motor voltage of the second DC motor is less than an open-circuit voltage of the battery for a desired battery discharge, so that the battery is discharged into the second DC motor.