... appreance,good Light transmittance,heat insulation,sound insulation Hollow solar modules solar pv modules Choice of Material ItemDiscriptionModule SizeFrom min 500 ... , 6mm, 8mm, 10mm, 12mmConstruction3.2mm-12mm glass+EVA/PVB+cell+EVA/PVB+3.2-12mm glassCell TypeMonocrystalline, PolycrystallineCell ColorBlue, Black ... years80% minimum of output power after 25 years Hollow solar modules solar pv modules