The PV plant shows heavy soiling. A considerable number of micro cracks and isolated parts were discovered through the electroluminescence sample. The module cables are extremely damaged, and some burned modules are found on-site. The modules have hand and shoe-prints. It is recommended to (i) Improve O&M activities, especially the cleaning, (ii) change the broken modules, (iii) install an irradiation sensor, and (iv) re-string the shaded modules. The estimated production boost expected by the retrofitting actions lies between 14% and 15%.
Modules with heavy soiling, due to poor cleaning and maintenance. Hot cells due to shading and soiling is impairing system performance. Soiling losses were determined to be around 17.6% based on the measurements
The modules with major EL failures can be compared with the manufacture catalogue and if applicable they can be replaced.
The cleaning cycles shall be increased based on the results of a soiling study that adjusts the cleaning needs to each season.
Cables should be tied up among the substructure, have a suitable labelling and should be protected from UV.
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.
Burned, broken Modules and Modules with damaged cables should be replaced.
A re-stringing of the modules from the shaded areas shall be conducted in the following way: modules with similar shading conditions shall be installed in the same string or at least assigned to individual MPPTs.
The lightning arrestor should be installed in an adequate way.