Solar panels are becoming an important addition to roofs around the world. While solar shingles may represent the cutting edge use of solar cells. Photovoltaics (PV) is the field of technology and research related to the application of solar cells for energy by converting sun energy (sunlight or sun ultra violet radiation) directly into electricity. Solar panel modules can be installed or integrated on to your roof or on the ground. When the sunlight comes in contact with the solar panels, it is converted into power. The power goes through a solar inverter, which converts it into alternating current and passes it on to your home through a service panel. If you produce more energy than you need, the excess can be run back through your meter into your electric company's grid.