CORRECTING TEMPERATURE-DEPENDENT EFFICIENCY MODEL FOR COMMERCIAL DOUBLE JUNCTION THIN FILM SILICON MODULES

摘要

The prediction of energy yield of photovoltaic modules is essential for avoiding energy losses and for marketing purposes. Temperature is one of the most critical factors that influence the efficiency swing of the modules under real-life conditions. Experiments show that the temperature-dependent efficiency model based on conversion efficiency temperature coefficient is inadequate for single and multi-junction modules based on thin-film silicon technology. Due to the Staebler-Wronski effect, the efficiency depends not only on the temperature at the instant of the measurement but also on the operating temperature history of the module. Here we indicate the module's stabilized efficiency (η_s) as a meaningful factor for correcting the temperature-dependent efficiency model.