The PV plant is affected by nearby shading from trees and roof structures. The electroluminescence investigation showed some micro cracks and isolated parts. Furthermore, the DC wiring is not installed correctly. It is recommended to (i) replace the broken modules, (ii) increase the cleaning frequency, (iii) replace modules exceeding the manufacturer’s guaranteed performance drop and (iv) fix shading problems. The estimated production boost caused by the retrofitting actions lies between 12-18%.
The system grounding is not installed securely.
String cables damaged by or in contact with sharp edges were spotted.
The cables of the irradiation sensor are not installed correctly.
The connectors of the string cables at the inverter are not correctly attached.