Investigating the Influence of PV Panel Sizes on Wind-Induced Loads

The growing trend of installing larger photovoltaic (PV) panels on residential buildings has underscored the need to assess wind loads on panels with chord lengths exceeding those specified in ASCE 7-22. This study explores the aerodynamic performance of PV panels on gable roofs in residential settings, examining the influence of panel size through physical tests conducted at the NHERI Wall of Wind Experimental Facility. Findings indicate that larger panels reduce both local peak negative pressure coefficients (Cp) and aerodynamic force coefficients (Cf). Large panels in portrait orientation with partial coverage demonstrated the lowest aerodynamic loads. However, area-averaged peak Cp values often surpassed ASCE 7-22 thresholds, especially in central roof areas, indicating a need for updated guidelines. Future research should investigate a wider range of roof types and real-world installations to improve design resilience and regulatory adherence.