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.