The PV plant consists of a 46 kWp and a 19.2 kWp system. The latter is shaded by the building of the former. The bigger plant shows design failures such as self-shading, near shading, and inadequate tilt angle. The building services vent directly to a module. Cable management and structure are in poor conditions. It is recommended to (i) retrofit the mounting structure including a tilt angle change, (ii) repair inverter room, (iii) replace damaged modules, and (iv) re-arrange the strings based on the shading. The estimated production boost expected by the retrofitting actions lies between 7 and 10%.
Poor cable management: Labelling of strings is missing, cable conduits are degraded, and the bending radius of the cables was not regarded.
A damaged module is connected to the system, resulting in low generation.