Photovoltaic system with targeted error adjustment to the MPP

The method involves applying direct-current output voltage of a photovoltaic generator (1) to input terminals (3, 3') of a photovoltaic system, and connecting an output of the system to a supply network (7). Maximum power point of the photovoltaic generator is adjusted by a regulating element of an inverter (5). The photovoltaic generator is operated by turning-off the adjusted regulation of the maximum power point to provoke discharge current from a battery bank (9) to input terminals of the inverter when a predetermined minimum power of the photovoltaic generator is not achieved. An independent claim is also included for a device for operating a photovoltaic system.