On-site EL is starting a quality revolution
EL inspection is commonly used in module production lines, most buyers request 100% module EL inspection before delivery. Unfortunately the same quality request is not applied to the PV plants.
The above photo shows an EL image of a PV array, serious cell breakage is found in the middle of the modules. This kind of breakage frequently happens during installation or maintenance, but only few really check it on the PV array. EPCs request a very high quality standard for modules, but many of them do not apply the same request level to their installations. We have seen many installers and panel cleaning workers walking on the modules, and some owners even invite guests to take photos standing on the modules.