EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 4CO.2.5 Repair of Cracked Backsheets: Long-Term Stability
Type: Oral
Date: Wednesday, 8th September 2021
13:30 - 15:00
Author(s): Y. Voronko, G.C. Eder, W. Mühleisen, L. Neumaier, C. Breitwieser, K. Knöbl, S. Feldbacher, G. Oreski, N. Lenck
Presenter / Speaker: G.C. Eder, OFI, Vienna, Austria
Event: Conference Conference
Session: 4CO.2 PV Module Backsheets
Topic: 4. 1 PV Module Design, Manufacture, Performance and Reliability
Summary / Abstract: Polymeric photovoltaic (PV) backsheets are designed to protect the active components of the module (solar cells, electrical connectors) from environmental stress and act as an electrical insulator according to the required safety specifications (IEC 61730-1). Several variations of backsheet compositions are available on the market, mainly laminated multi-layer stacks and co-extruded films. When looking at the reliability of glass/backsheet modules it was noted that the most frequent backsheet failures are cracking, delamination and yellowing [1]. Within the last decade, an enhanced occurrence of backsheet defects was observed in the field after only 4 to 7 years operational time (see figure 1) and reported at several conferences and publications. Premature material degradation of backsheet leads to cracking of diverse severity and can cause a reduction in electrical safety - in worst case electrical insulation failure. Materials cracking was noticed mostly with PA (Polyamide), PVDF (Polyvinylidene Fluoride) and PET (Polyethylene Terephthalate) based backsheets