When a PV-system is installed, sunlight is converted into electrical energy using solar cells. The solar cell usually consists of a semiconductor, which is often made of silicon. When the solar cell is irradiated with light, a special arrangement of semiconductor layers creates free charges. These charges flow off as electrons via an electrical conductor. The direct current generated is converted into alternating current by an inverter, which can then be used to operate a company building, for example for lighting or the use of machines and electrical appliances.