Meteorological station of the

Solarhaus at TH Lübeck

The first meteorological station of the Solarhaus at TH Lübeck was put into operation in 1985 and was substantially extended in 1993 and 2021. The special focus of the station are the measurements of solar radiation usable for the photovoltaic energy conversion. These observations are automatically and continuously performed using an array of advanced pyranometers (yielding and solar radiation flux
density) oriented along different directions of the sky. Parameters measured by the weather station are the solar irradiation, humidity, and temperature. The data has been recorded since 1985. Recent measurements are made available to the public using dedicated web page (https://wetter.th-luebeck.de). Long-term observations are provided to interested research groups on request. With the new computer control system in operation, the data availability of weather station exceeds 99%. The picture on the right is showing a part of the weather sensor array of the Solar House.
Visible are the multi-pyranometers and the anemometer (for wind speed measurements) combined with the wind vane.
Outdoor measuring station
The outdoor measuring station is used to measure different solar cells of different shapes and sizes under real conditions. It consists of a scaffolding which is assembled from aluminum profiles and a 6 mm thick Plexiglas plate on top, on which a pyranometer is attached. The setup is also used to attach the solar cells and can be tilted and rotated to point along every direction of the sky. In combination with the data from the in-house weather station, the outdoor measuring station can provide data for the characterization of various solar cells. The current-voltage characteristic required for the characterization of solar cells can be recorded using the source measure unit 2400 from Keithley and a self-written software. These measurements allow to refine models for the optimal orientation of the cells in this particular region of Germany, taking into account the actual long-term relationship between direct and diffused sunlight. Furthermore, aging processes in the cell can be reliably investigated. Based on the photovoltaic laboratory, the thermoelectric laboratory and the outdoor measuring stand with the weather station, prototypes can be tested and measured under comparable and reproducible laboratory conditions as well as under real environmental influences.
This allows us to test the prototypes for the Solar Decathlon in the best possible way and to research them for the realization in the HDU.