Correlating field experimentation and image analysis for the assessment of induced losses from thin object shading on photovoltaic sources

Abstract

This research investigates the correlation between the size and intensity of both umbra and penumbra shadow formation and the resulting power loss, based on field experimention using various thin objects to cast shadows on a photovoltaic (PV) module. The results from the Spearman correlation matrix clearly demonstrate that the significance of both the umbra and penumbra size increases as the thickness of the shading object increases. Additionally, it has been noted that penumbra intensity plays a crucial role in power loss for thin objects ranging between 2.8 and 12mm in thickness. This study identifies the range of distances at which thin objects, ranging from 2.8 mm to 12 mm in thickness, produce zero power loss, indicating no observable effect on the performance of the PV module. By understanding these key aspects, other researchers and PV system owners can better assess the impact of shadow factors on their respective systems. Consequently, the findings from this study are also valuable for determining the impact of certain thin objects typically found on rooftops, helping to optimize the design of PV systems without compromising the functionality of the building.