The sunshine/sunshine duration sensor records global, diffuse and direct radiation, cloud cover and shadows from wind turbines.
The DK-SOL1 sensor is capable of detecting shadows in its surroundings caused by solar radiation. The system consists of two DK-FM1 brightness sensors spaced 90 mm apart. This system is oriented to the south, with the front sensor directly exposed to sunlight, while the rear sensor is protected from direct sunlight by a sunshade. This sensor only detects the incoming scattered light. The ratio of the two output signals can then be used to determine whether the sun is shining and whether shadows are forming. The sunshade template was calculated for latitudes between 48.15° (Munich) and 54.3° (Kiel).
Assembly
The location where the sensor is mounted must be free of shadows throughout the day and at any time of year. Surrounding objects (e.g., trees, masts, etc.) must not cast shadows on the sensors. Care must also be taken to ensure that no reflections from the surrounding environment (window panes, metal surfaces, walls) fall on the sensor. The sensor is mounted on an adjustment plate. After attaching the sensor to the mast, it is aligned precisely due south. Radiation measuring devices such as the DK-SOL1 should be checked monthly for horizontal alignment (spirit level).
