Discoloration, oxidation, and corrosion of connectors’ defects can also affect the PV modules’ electrical characteristics, but their inspection is quite easy by visual observation. Other phenomena such as snail trails, shading, hotspots, micro cracks, and cell breakage defects can have the highest influences on the performance of the PV modules as discussed later on. These kinds of failures can, in fact, be better detected using also thermal and infrared cameras.