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Bifacial Modules – Verifying Quality and Power Output
July 5, 2018 @ 3:00 pm - 4:30 pm
The global photovoltaic (PV) industry is experiencing a boom of bifacial PV modules. With an extra energy gain from the rear side, bifacial PV modules find themselves with versatile and promising application possibilities in many fields, from building integrated photovoltaics (BIPV) to utility-scaled power plants. The most important factor in setting the prices of PV modules is still the power rating under Standard Test Conditions (STC: device temperature of 25 ºC and incident irradiance of 1000 W/m2 with the spectral distribution AM1.5G as defined in IEC 60904-3). This leads to the first technology-related problem, that is, how to define, measure and rate the electrical output power of bifacial PV modules considering the rear-side power contribution. This also stirs up a heated argument in the PV industry because the rear-side irradiance is strongly dependent on the environmental factors and installation configurations.
Dr. Christos Monokroussos is a technical expert and director of the competence center for R&D for TÜV Rheinland. Christos’s activities in TÜV Rheinland focus on R&D in the fields of characterization of solar cells and PV-modules, quality control of measurement systems, standardization progress and PV-module reliability. Christos earned his doctorate degree in photovoltaics in the Centre of Renewable Energy Systems Technology (CREST), Loughborough University, UK.
Dr. Werner Herrmann studied physics at Technical University Aachen and received his PhD in electrical engineering from University Hannover. He joined TUV Rheinland in 1988 and was responsible for the development of test equipment for PV module product certification, which started in 1995. His general research focus is on development of measurement and testing methodologies for PV modules and on failure diagnostic techniques for PV modules. More recently he has been studying the climatic impacts on PV energy yield. He is member of working group “WG2 – PV modules” of IEC TC82 and has more than 20 years’ experience in developing test standards.