Some modules with mechanical damages were detected (broken modules). Cables hang under the modules were found. Interrow distance is insufficient. Structural earthing is incomplete and corroded. It is recommended to (i) increase the cleaning cycles, (ii) replace damaged modules and cables, (iii) retrofit the mounting structure, (iv) install a new earthing system, and (v) install a weather station or at least an irradiation sensor on the module plane to quantify and monitor the Performance Ratio. The estimated production boost expected by the retrofitting actions lies between 10 and 15%.
Inverters placed under the modules limiting air circulation.
Base plates, connection bolts and most of the welded areas are rusted.
Change the location of the inverters in
order to avoid hot spots.
A weather station, or at least a irradiation sensor on the module plane shall be installed so the performance of the system can be properly determined.
The cable layout can be optimized.
Earthing connections between modules
shall be added.
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.
Strings, Tables, and inverters should have a suitable labelling (UV-resistant if applicable).
Rusted clamps and structure should be replaced if possible. To prevent such problems, metal objects vulnerable to corrosion can be painted with zinc.
In case it is possible, interrow distance shall be increased to avoid self-shading.