We dealt with following systems

Turn-key solar hot water system

The solar constant of 1367 W/m2 changes only 1% in 100 mio. Years. As the solar energy enters the Earth’s atmosphere some of it is absorbed, deflected and or reflected (scattered) by clouds, water vapour and particles in the air. The utilizable irradiation depends on geographical position, weather influences, shading, altitude, and smog and is diagrammed in the global irradiation map in kWh per year. The position of the sun changing every minute and is linked to the seasons. After the right choice of inclination and orientation of the solar panels we get the irradiation onto the solar surface area. The solar yield on tilted surface is higher than the global irradiation on the horizontal collector.