The photovoltaic effect underpins the process of converting solar energy to electricity. This interaction cause electrons from their atoms, generating a flow of. The amount of sunlight that strikes the earth's surface in an hour and a half is enough to handle the entire world's energy consumption for a full year. Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar. Photovoltaic (PV) technology, solar thermal systems, and concentrated solar power (CSP) are the primary methods deployed for capturing and utilizing solar energy. Solar panels, also called PV panels, are combined into arrays in a PV system. PV systems can also be installed in grid-connected or off-grid (stand-alone) configurations. The two dissimilar semiconductors possess a natural difference in electric potential (voltage), which causes the electrons to flow through the external circuit, supplying power to the load.