Several modules with cell breakage and isolated cell parts were detected. Cables and connectors were exposed to ambient without any UV protection, they also display signs of abrasion and cuts. Several clamps were improperly fixed, and many were faulty. It is recommended to (i) optimize the cable layout (ii) replace rails that offer better ventilation (iii) restring the modules with cell breakage, and shaded module to dedicated strings, and (iv) install a weather station or at least an irradiation sensor to monitor performance ratio. The estimated production boost expected by the retrofitting actions lies between 6% and 10%.
The cable layout shall be optimized, the minimum bending radius shall be 10x the cable diameter, and cable racks shall be used.
Rails used currently of around 30 mm height shall be replaced with ones that offer an effective clearance of 100 mm to facilitate better air flow and improve system performance.
Open shaft holes shall be covered since they pose a several threat to the O&M personnel.
A proper O&M plan shall be established that includes instructions on module handling.
A re-sorting shall be conducted to have modules with isolated parts in the same string or at least same MPPT.
A re-stringing of modules shall be conducted to have shaded modules in the same at least same MPPT.
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.
Faulty clamp fixations shall be properly fixed, and clamps with faulty threads shall be replaced. Rusted clamps should be replaced if possible. To prevent such problems, metal objects vulnerable to corrosion can be painted with zinc.