The PV plant is heavily affected by nearby and inter-row shading. Module with micro cracks and isolated parts were discovered through the electroluminescence sample. The used module clamps are rusty, and some are falling off. The module cables are hanging lose and in some parts the UV protection is missing. It is recommended to (i) improve O&M activities, (ii) change the module clamps, (iii) install an irradiation sensor, and (iv) re-string the shaded modules. The estimated production boost expected by the retrofitting actions lies between 5% and 10%.
Cables should be tied up among the substructure, have a suitable labelling and should be protected from UV.
Modules with major EL failures can be compared with manufactures catalogue and can be replaced, if applicable.
Trees surrounding the system shall be trimmed if allowed. Otherwise, a re- stringing of the modules shall be conducted in the following way: modules with similar shading conditions shall be installed in the same string or at least assigned to one MPPT.
The cleaning cycles shall be increased based on the results of a soiling study that adjusts the cleaning needs to each season.
A weather station, or at least an irradiation sensor on the module plane, shall be installed so that the performance of the system can be properly determined.
The rusted module clamps should be replaced, and all screws of the clamps should be tight up.
A lightning and earthling system should be installed.