A photovoltaic system comprising an inverter adapted to convert a DC power supplied by photovoltaic modules of a photovoltaic generator via power cables to said inverter into an AC current for an AC power supply grid, wherein the inverter has a base station connected by means of the power cables to the module level devices which are provided to monitor and/or to control associated photovoltaic modules of the photovoltaic generator, wherein if the inverter does not receive sufficient energy from the photovoltaic generator and the AC power supply grid, a controller is adapted to activate a deadlock prevention mode of an energy supply unit connected to the inverter where the inverter receives energy from the energy supply unit such that the base station of the inverter is able to continue to transmit permission to operate, PTO, signals via the power cables to the module level devices of the photovoltaic generator.