Solar Photovoltaic (Solar PV) is a method of converting solar energy directly into electricity by using semiconductor materials. This can be used in a system that is designed to supply usable solar energy. It typically consists of an arrangement of several components such as solar panels to absorb and convert sunlight into electricity. They can range in size from small roof top installations to large building integrated systems with the capacity from several tens of kilowatts to large utility stations. Most systems these days are connected to the grid while stand alone systems are only a small portion of systems out there.