Cable layout with loosely hanging cables were found. Modules with manufacturing and other defects were found on site. Several structure related problems were observed. It is recommended to (i) optimize cable layout, (ii) replace defective modules, (iii) re-sort and restring modules, (iv) replace faulty and unsuitable clamps and structures, and (v) install a weather station. The estimated production boost expected by the retrofitting actions lies between 5% and 7%.
Loosely hanging cables shall be routed using appropriate tags. UV protection measurements shall be taken by a suitable rack with roof or cable coating.
The inverter filters and fans shall be cleaned.
Manufacturing defects shall be investigated for possible warranty claim.
Modules with broken back-sheet and sealant gap pose performance and safety threats, which shall be replaced.
A re-sorting of modules shall be conducted so that the lower performing modules are in the same string or at least in the same MPPT.
A re-stringing of modules shall be conducted so that the shaded modules are in the same string or at least same MPPT.
Module tilt shall be changed to optimal tilt of 25°.
Clamp variations used in the same table shall be replaced with appropriate clamps of same type. The structure and components shall be replaced or retrofitted to sustain any future damages from cyclones.
A weather station, or at least an irradiation sensor on the module plane shall be installed.