However, dual-glass modules have certain disadvantages that are important to take into consideration during the product design phase. One of the main disadvantages concerns the hail resistance. To simplify, the hail resistance of a photovoltaic panel is mainly linked to that of its upper layer.
Compared to traditional glass-foil modules, which are about 18 kg, this is a 20% increase in weight. Although there is no standard on glass thickness, in general it is a more complex and expensive process to produce very thin, tempered glass. However, 2.5 mm glass thickness does allow for frameless designs, which can reduce costs dramatically.
However, 2.5 mm glass thickness does allow for frameless designs, which can reduce costs dramatically. Figure 2 – Market share of different front glass thicknesses for modules, where majority front-glass only modules use 3.2mm thickness. This shows how immature very thin glass currently is.
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