Photovoltaics is more than just environmentally friendly energy generation. With sophisticated technology and a long service life, photovoltaic systems are the profitable and easy way to produce electricity. Photovoltaics refers to the conversion of sunlight into electrical energy. Solar cells are connected in series or in parallel and convert the light into voltage. The cells consist of silicon crystals – silicon is the second most abundant element on our planet and is considered to be infinitely available. Chemical production is also possible. The common photovoltaic modules are constructed in several layers. The conversion of sunlight into electrical voltage occurs in the cells made of silicon crystals located in the core of the module. Photovoltaic modules are available in many versions, depending on the intended use and design, the structure varies. The silicon cells, however, always form the basis of this technology.