A photovoltaic system employs solar modules, each comprising a number of solar cells, which generate electrical power. The mount may be fixed or use a solar tracker to follow the sun across. . Photovoltaics (PV) is the conversion of light into electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon studied in physics, photochemistry, and electrochemistry. A single PV device is known as a cell. An individual PV cell is usually small, typically producing about 1 or 2 watts of power. Some PV cells can convert artificial light into electricity. Sunlight is composed of photons, or particles of solar energy. 00 per watt and utility-scale installations at $0. Rapid Global Adoption: The photovoltaic industry has reached a milestone with over 2,000 GW of global installed capacity by. .