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Repair and Preventive Maintenance of PV Modules with Degrading Backsheets Using Flowable Silicone Sealant
G. Beaucarne, G.C. Eder, E. Jadot, Y. Voronko, W. Mühleisen
Degradation, Cracks, Preventive Maintenance, Backsheet Repair, Flowable Silicone
PV Systems – Modelling, Design, Operation and Performance
Subtopic: Operation, Performance and Maintenance of PV Systems
Event: 38th European Photovoltaic Solar Energy Conference and Exhibition
Session: 5DO.2.6
1051 - 1053
ISBN: 3-936338-78-7
Paper DOI: 10.4229/EUPVSEC20212021-5DO.2.6
0,00 EUR
Document(s): paper, presentation


PV modules with a degrading backsheet are a problem for the complete PV value chain. Some types of backsheets are known to develop cracks because of an aging-induced change in the mechanical characteristics of the material during operation in the field, which results in a loss of insulation resistance. In this work, we present a solution for repair and preventive maintenance based on a single component flowable silicone sealant. The method fills the cracks present in the backsheet with an insulating material, restores the insulation resistance, and provides a protective layer to avoid subsequent degradation. The solution was successfully implemented on the back of PV modules with coextruded polyamide backsheet (‘AAA’) which showed deep cracks following degradation 5-7 years of operation in a solar park. The repaired modules had a restored insulation resistance of several hundred MΩ as observed with wet leakage testing, and maintained a high resistance after accelerating aging. This repair technology can be done in the field and is an alternative solution to module replacement.