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Energy Yield Measurements of Bifacial PV Modules Mounted on a Cold Façade
S. Dittmann, H. Sánchez, J. Palacios, R. Gottschalg, J. Bagdahn
Photovoltaic Modules and BoS Components
Subtopic: PV Module Design, Manufacture, Performance and Reliability
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 4CO.2.3
ISBN: 3-936338-73-6
0,00 EUR
Document(s): presentation


It is well known that bifacial photovoltaic (PV) modules can utilize incident sun light via frontand rear side absorption. This allows higher energy production under various installation conditions such as large solar farms or roof-top installations. However, the bifacial energy gain depends highly on, e.g., module design, mounting method, and reflectivity of the background. Several studies describe the energy gain of bifacial module in open-rack or even on industrial roof-top installations but building integrated PV (BiPV) installations are rarely considered. Our paper reports on one-year energy yield measurements of bifacial PV modules mounted in a cold or ventilated façade (two skin layer). Different background colors such as white and gray have been investigated. All measurements were performed in real operation condition at our outdoor test facility. Furthermore, as a comparison, the same module types have been monitored in an open-rack installation. Measurement data over one year of both installations will be presented in the final paper. The energy yield will be compared to a monofacial reference modules. We will also present the potential of the rear side irradiance in the façade and the impact on the energy yield in terms of irradiance non-uniformity and module’s temperature. Preliminary results show an energy gain of the bifacial modules of up to 8% and up to 4% with a white and grey colored façade, respectively. However, we observed that modules mounted on the edge of a façade show lower energy yield due inhomogeneity of the rear-side irradiance, which lets also to higher module temperature.