The PV plant shows moderate levels of soiling. The system design disregarded near shading and self-shading losses. Poor cable management was found. Cracks of different severities were detected via EL inspection. It is recommended to (i) increase the cleaning cycles, (ii) trimming of trees surrounding the system if allowed by the authorities, (iii) install an irradiation sensor on the tilted plane to compute and check the Performance Ratio, (iv) re-sort the modules according to level of mechanical damage, and (v) rearrange the strings based on the shading situation. The estimated production boost expected by the retrofitting actions lies between 5% and 10%.
Poor cable management: Module cables are not attached to the frame or laying on the ground, and a broken cable was found.
A weather station, or at least an irradiation sensor on the module plane, shall be installed to properly determine the performance of the system.
The cleaning cycles shall be increased based on the results of a soiling study that adjusts the cleaning needs to each season.
Module with damaged junction box shall be replaced.
The trees surrounding the system shall be trimmed if allowed. Otherwise, a re- stringing of the modules with similar shading conditions shall be installed in the same string or at least assigned to one MPPT.
Modules with heavy cracks shall be grouped in the same string or at least assigned to one MPPT. The grouping will be conducted based on infrared inspection.