Patent ID: 8081065

Claim:
A photovoltaic plant comprising a device for protecting this photovoltaic plant against rodent bite damage, wherein the photovoltaic plant comprises several components, among them solar cells, a control unit, an inverter, an internal voltage supply and at least one microcontroller integrated in the control unit, said components being interconnected via corresponding lines, wherein the device comprises an ultrasonic transmitter integrated in the inverter for emitting an ultrasonic signal, and the ultrasonic transmitter is connected to the at least one microcontroller, the control unit monitoring status of individual terminals for connection with the solar cells to determine which solar cells are active and how much direct current the solar cells supply, the at least one microcontroller controlling said monitoring such that the ultrasonic signal emitted is controllable in dependence on the direct current delivered from the solar cells and on when dusk is recognized by the at least one microcontroller via measurement of the direct current supplied by the solar cells.