Poly Crystalline 40 W Solar Panel absorb sunlight as a source of energy to generate electricity. A photovoltaic (PV) module is a packaged, connected assembly of typically 6x10 photovoltaic solar cells. Photovoltaic modules constitute the photovoltaic array of a photovoltaic system that generates and supplies solar electricity in commercial and residential applications. Panels are made up of poly crystalline silicon. Poly crystalline panels consist of many crystals in each cell, there is less freedom for the electrons to move.