light, flexible pv roofing shingles for direct building-integrated mounting can. a building that makes its \”technical\” function visible thanks to a multifunctional building envelope a noteworthy feature is the building-integrated . of between 30% and 90%, the visual transparency can be varied individually in doing so, the g value gradually changes from 44% at 30% cell coverage to . building with integrated photovoltaics. fraunhofer center for silicon photovoltaics csp. organic photovoltaic powered solartree. solar pv facades. building integrated photovoltaic. kingsgate house. visualization: \”center for high-efficiency solar cells\” [ jpg 113 mb ]. solar microgrids for mobile phone towers.