There may be degradation of modules caused by bypass diode damage, PID effect, shadow, different obliquity, dust and other problem in the application of solar plant. These phenomenons could lead to dropping of string voltage, and voltage mismatching of the strings.
We successfully made another thermo diagnostics of PV plant with drone
The company EICERO - specialist in the diagnostics of PV plants, made another successful IR diagnostic held in cooperation with the company Robodrone Industries. Complete diagnostics was really fast thanks to drone.