The solar module converts solar energy directly into electricity and is composed of solar cells assembled mechanically.
The crystalline photovoltaic solar cells consist of a layer of semiconductor material, the most common of which is silicon and could be black or blue color and vary in size from 4 to 6 inches. The crystalline photovoltaic cells are usually arranged in thin flat layers connected to each other, or may be obtained by creating a thin uniform film by spreading material directly on a support thanks to the vacuum technology.
The photovoltaic cell consists of a very delicate material, it is secured at the top by a glass or other transparent material specifically treated. The most used consists of a rectangular panel, often a few millimeters, with an area of between 0.1 and 3 m2, some kg weight , with different benefits depending on the quality of the cells used in its manufacturing technology.
The photovoltaic module can be either monocrystalline (if the used cell is made from a wafer whose crystal structure is homogeneous (single crystal)) or poly (in which the wafer above is not structurally homogeneous but locally organized in grain ordered).