How does a PV (photovoltaic) System work?
When the sun strikes the PV panels, which are typically 1.5m x 1m in size, direct current (DC) is produced, and converted into alternating current (AC), by an Inverter at 230 volts, which is sent to your fusebox, to power your home. PV Panels consist of a number of Cells. Each Cell has two layers of Silicon, one doped with Boron, the negative layer (n), the other with Phosphorous, the positive layer (p). When joined together and light strikes them, the (p) layer attracts electrons from the (n) layer, hence electricity flows, and a watt or two of energy is produced. Cells vary in size from 100mm sq to 150mm sq. 50 to 70 Cells per Panel are imbedded in resin, topped by glass, and placed in aluminium frames. The average Panel produces about 200 watts at 30/40volts. Various switches isolate each part of the system and an output meter supplied. Your Supplier may install a meter to measure the energy you export to the Grid in summer. The best Solar PV System available is close to 20% efficie
