Cables with low bending radius were found. Several issues concerning mounting structure and components were observed. It is recommended to (i) optimize the cable layout, (ii) relocate the modules from roof boundary, (iii) re-string shaded modules, (iv) retrofit the mounting structure, (v) trim the surrounding trees, and (vi) install a weather station or at least an irradiation sensor on the module plane. The estimated production boost expected by the retrofitting actions lies between 5.1% and 7.3%.
Strings, tables, and inverters should have a suitable labelling (UV-resistant).
Modules with foreign material stuck on glass shall be replaced since they can generate permanent hot cells that may pose performance and safety threat in the long run.
Modules installed at the module boundary shall be moved away from it to prevent damage from wind loads.
Retrofitting actions shall be done on the structure to have the vertical posts, support straps, and structure purlins properly fixed on the structure. This reduces the module misalignment observed on site.
Deformed L channel rafters shall be replaced since their functionality may be reduced or compromised.
Rusted components of the structure shall be replaced if possible. To prevent such problems, metal objects vulnerable to corrosion can be painted with zinc.
The trees surrounding the system shall be trimmed if allowed.
A re-stringing of modules shall be conducted to have shaded modules in the same MPPT.
A weather station, or at least an irradiation sensor on the module plane shall be installed