Solar power modules use tracking systems for perfect positioning toward the sun. Compared to fixed mounted modules there is a current efficiency increase of 30% to 40%. The control system continuously calculates the actual position of the sun using the GPS coordinates of the place, time and date. This way, even with overcast skies and the sun at a low angle, the modules can be positioned to an optimum angle. Novotechnik sensors measure the positioning of the solar power modules.