The PV plant is affected by near shadings caused by trees, walls, and cables. Furthermore, the modules show heavy contamination that has developed in hot cells. Additionally, the inverter of one rooftop (50 kWp) is not working. It is recommended to (i) carry out a deep cleaning of heavily contaminated modules, (ii) replace the malfunctioning inverter, (iii) trim trees and remove shading objects close to the system and (iv) replace or re-group modules with multi-cracks. The estimated production boost caused by the retrofitting actions lies between 9 and 30%.
A weather station, or at least an irradiation sensor on the module plane, shall be installed to determine the performance of the.
The trees surrounding the system shall be trimmed if allowed and the objects near the modules removed. Otherwise, a re-stringing of the modules shall be conducted according to their shading conditions to avoid shadowing losses.
The cleaning cycles shall be increased based on the results of a soiling study that adjusts the cleaning needs to each season.
Modules with highly damaged cells shall be replaced or grouped in the same string or at least assigned to one MPPT.