Fresh Questions, Practical Answers: PVsyst Q&A Series #11

Friendly Tip: The version used for the following Q&A is PVsyst 6.68 or above. For other versions, please refer to this for guidance. 1. In the PVsyst 6.70 version, why is the near-field shading loss not 0% after selecting inverse tracking for a flat single-axis bifacial system? [Teacher Jiang from Candela Academy]answer: Solar radiation primarily consists of direct radiation, scattered radiation, and reflected radiation from the terrain. Direct radiation is a portion of solar radiation that strikes a surface as parallel rays. When PV modules are shaded, distinct shadows are cast behind them. The 'Near Shading loss' in near-field shadow loss primarily encompasses the obstruction loss of direct radiation, scattered radiation, and reflected radiation, which is present in both fixed and tracking systems. However, using backtracking reduces the obstruction loss of direct radiation to zero, revealing the loss of scattered radiation, which is always mixed and cannot be separated in…