The roughness is typically characterized by parameters such as Ra (arithmetical mean deviation of the assessed profile), Rz (average maximum height of the profile), and Rq (root - mean - square deviation of the assessed profile). . Surface roughness is a critical parameter in the manufacturing and performance of tempered solar panel glass. As a seasoned supplier of Tempered Solar Panel Glass, I have witnessed firsthand the significance of understanding and controlling surface roughness to ensure optimal solar panel efficiency. . In this work, the reflectance, surface roughness and reflected solar beam spread were measured from various photovoltaic modules acquired from seven different manufacturers. The surface texturing of the PV modules varied from smooth to roughly textured. Correlations between the measured surface. . NGA has published an updated Glass Technical Paper (GTP), FB39-25 Glass Properties Pertaining to Photovoltaic Applications, which is available for free download in the NGA Store. NGA volunteers update Glass Technical Papers (GTPs) through the systematic review ballot process on a 5-year cycle. . Manufacturers of crystalline silicon solar modules apply glass substrates on the front side of the solar modules. This front glass will either be a patterned glass or a glass with anti-reflective coating (AR). As in all other glass manufacturing processes, solar glass substrates are subject to. . A degree of roughness is necessary at each coatings interface to another to increase the possibility of light scattering within their respective depletion zones and increase the absorption of light within the cell1. Optimizing the surface roughness in these regions allows the solar cell to operate. . Photovoltaic (PV) glass is revolutionizing the solar panel industry by offering multifunctional properties that surpass conventional glass. This innovative material not only generates power but also provides crucial benefits like low-emissivity, UV and IR filtering, and natural light promotion.