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The increasing use of thin film photovoltaic modules and the increasing occurrence of damages raise the question about a sufficient safety level for the glass-glass-modules used at present. This paper compares the experimental determination of the load-bearing capacity used in the solar industry according to IEC 61646 and a calculative method according to the German structural design standard for glass structures (DIN 18008). Substantial differences in the safety level are pointed out. Moreover, the load case “temperature” can become relevant for the structural design because of the high solar absorption of the modules. This influence is currently not regulated in the standards. For typical installation situations, a calculative consideration of this load case is discussed.