• What is PV? PV is the general international abbreviations for Photo-Voltaisch (voltaic) conversion. • What is Photo-Voltaic Conversion? If certain materials receive sunlight (light) then this light is converted into electricity (Edmund Becquerel - 1839). • What is a Solar Cell? A Solar cell is a sheet of material which converts sunlight (or artificial light) into electricity, for example: crystalline silicones 125 x 125 x 0,2 mm/2,5 Wattp cell. • What is a PV module? A PV module is an element in which Solar-cells have been assembled and connected in series In General this a glass plate (special glass) on which solar cells are attached and connected to each other. Afterwards the total package of Solar-cells is electrically isolated and covered and sometimes packed into an aluminium frame, for example 72 Solar-cells in one 180 WP module (Outside dimensions 1580 x 808 x 50 mm = about 1.28 m²). Several modules can be connected together to a PV extraction field, for instance: 21 modules of 180 WP = 3.78 KWp 26.8 m².

• Which PV systems do exist? Because electric energy can only be generated by sunlight (daytime) and most of electricity is used when it’s dark and because the extraction time does not coincide with the time of use (day versus night, summer versus winter), the extracted electric energy must be stored. Here fore, depending on the installation capacity, the following systems do exist:

Grid coupling systems are possible from: Small 1000 WP installations = 6 x 180 WP modules To Large 10 MWp PV extraction fields = 10.000.000 WP= 55.600 x 180 WP modules Depending on the installation capacity an output of 20-25%* is possible. (Rate of return 4 - 5 years)