Solar Lattice

Mitigation

Glass crack resealing

ID
mit:glass-resealing
IRI
https://solarlattice.org/kb/mit/glass-resealing
Status
active

Glass crack resealing means sealing small cracks in a module's glass instead of replacing the whole module. It is a possible response to glass breakage. The source supports resealing only for minor cracks and says it may help only for a limited time, not as a permanent fix. Modules with broken glass should normally be replaced, especially when there is a safety or insulation risk. Broken module glass is treated as a catastrophic failure because it compromises the module's mechanical and electrical safety. Loss of insulation can be the first fault the inverter reports. Cracked glass can let in moisture and cause insulation faults that may stop the whole plant. Internal arcing and fire are possible later failures. Find cracks before deciding on a repair, using visual inspection, infrared imaging and monitoring data. On thin glass/glass modules, check the rear side, because cracking often starts on the rear glass. Resealing does not remove the cause, so also investigate what broke the glass, such as clamp stress, hail, handling or thermal damage.

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