A solar PV system consists of modules, which are linked together to form an array on the roof of a structure or pole mounted on the ground. The modules are comprised of crystalline silicone cells, either mono or poly crystalline, that are linked together by a semi-conductor material across the face of the cell. The cell is produced with two layers - an n-type layer on top, which contains an atom with an additional electron, and a p-type layer on the bottom, which contains an atom with one less electron.