PV materials and devices convert daylight into electricity. One PV device is understood as a cell. A private PV cell is sometimes little, generally manufacturing concerning one or a pair of watts of power. These cells square measure made from completely different semiconductor materials and square measure usually but the thickness of 4 human hairs. So as to face up to the outside for several years, cells square measure sandwiched between protecting materials during a combination of glass and/or plastics. To boost the facility output of PV cells, they're connected along chained to make larger units called modules or panels. Modules are used separately, or many are connected to make arrays. One or a lot of arrays is then connected to the electrical grid as a part of an entire PV system.