![]() ![]() ![]() PV SOL 7 5 CRACK CRACKEDPhotos with different levels of detail of an aged backside of a PV module with cracked backsheet (deep longitudinal cracks)Ī detailed error analysis of aged modules with cracked PA backsheets 4, 12, 13 revealed that the main drivers for the formation of cracks in coextruded PA-based backsheets are the daily and seasonal temperature changes and their corresponding thermomechanical loads/stresses due to different thermal expansion coefficients of the different PV module layers. Since the new and artificial reliability tests are still running, no final conclusions on the long-term behavior of the repair and its life-extending effect of PV modules can be drawn at the moment. The required insulation resistance of the aged modules could be restored. On the other hand, several repair coatings based on polyurethane, epoxy, silicone and synthetic rubber were identified which, after a two-step application process, showed complete crack filling and sealing of the surface. Therefore, adhesive tapes/films are not suitable for the repair of large-scale damage and the permanent restoration of the electrical insulation properties. The adhesive did not penetrate into the cavities that had opened through the cracks in the backsheet material. On the one hand, repair tapes/films sealed the surface and only covered the cracks. From a technical point of view, several of the repair solutions examined met the defined requirements for compatibility and applicability. Two different repair strategies have been addressed in this article: (i) repairing damage by restoring electrical insulation properties and (ii) preventing further growth of the surface near microcracks. The important topic of long-term reliability is still under investigation. A repair process has been developed that comprises the following steps: (i) cleaning, (ii) pretreatment, and (iii) repair process (crack filling and sealing). The paper provides a comprehensive overview of possible strategies for the repair of cracked polyamide-based backsheets. ![]()
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