Photovoltaic System

A photovoltaic system () comprising an inverter unit () adapted to convert an electrical direct current (DC) power generated by photovoltaic modules () into an electrical alternating current (AC) power supplied via AC lines () and a smart meter () of the photovoltaic system () to a power supply grid PSG () characterized by an emergency unit () having a controller (A) adapted to open an emergency switch () to automatically disconnect the photovoltaic system () from the power supply grid PSG () if a power supply grid failure is detected and adapted to notify a current switching state of the emergency switch () by means of power line communication (PLC) communication via the AC lines () to a controller of the inverter unit ().