FLAT ROOF INTEGRATION OF A-SI TRIPLE-JUNCTION FLEXIBLE MODULES

摘要

A flat roof of a surface of 900m2 (CPT: Centro Professionale di Trevano) has been recovered with thesingle ply roofing system based on flexible polyolefines (FPO) membranes laminated together with UNI-SOLARflexible modules. The mechanical characteristics and the reliability of the flexible polyolefines membranes has theright characteristics to be combined with 22-L-B (UNI-SOLAR) amorphous silicon triple-junction modules. The15.36kWp power plant is composed of three inverters SB5000TL. To each inverter four strings are connected. Eachstring is composed by 5 Sarnasol-PV modules, each Sarnasol-PV module by two 22-L-B Uni-Solar laminates. Thethermal insulation of the roof has a tilt of 3° to allow the rain to flow off.The thermal insulation does not allow a ventilation of the modules as usually requested by crystalline silicon PVmodules. This leads to the modules heating and consequently to a change of operating PV parameters. In the past animprovement of the energy yield could be observed caused by the thermal insulation of one string of an a-Si (singlejunction) installation situated on the roof of the LEEE-TISO laboratory. One of the scopes of the here presented study of the flat roof system is to verify in which order of magnitude the better thermal behaviour of a-Si technologies (annealing mechanism and lower temperature coefficients) can compensate for losses due to the quasihorizontal roof integration, and so to enter in the new build flat roof market and in the refurbishment market.