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Outdoor Testing Facility for an Experimental Validation of Yield Predictions for Building-Integrated Photovoltaic Modules
T. Gewohn, M. Koopmeiners, M.R. Vogt, B. Lim, C. Schinke, R. Brendel
BIPV, Outdoor Measurement, Energy Yield Prediction
PV Applications and Integration
Subtopic: PV on/in Buildings, Infrastructure, Landscape, Water and Nature
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 6CV.2.16
1915 - 1919
ISBN: 3-936338-73-6
Paper DOI: 10.4229/EUPVSEC20202020-6CV.2.16
0,00 EUR
Document(s): paper, poster


Existing models for calculating the horizontal irradiation in the module plane are not sufficiently accurate for modules tilted by 90°, i.e. modules on the façade. First, these models are usually empirical and not designed for this application. Second, the irradiation conditions for façade modules are much more complex, since the environment and the albedo have an impact. In order to identify deficiencies in previously established models and to improve the accuracy of yield predictions for façade modules, an outdoor test facility was built on a south façade at our institute. Since January 2019, all environmental parameters that are required for an energy yield prognosis are continuously being measured every minute. This is the global horizontal irradiance, the global and diffuse vertical irradiance on the façade, the ambient temperature and the wind speed. The energy yield, the current-voltage characteristics and the module temperature of three test modules are also measured every minute. The simulated energy yield of a façade module deviates from the measured yield by up to 7.6% per month if the most suitable model is selected. For on-roof modules, the maximum deviation in this period is 5% and thus significantly smaller.