Impact on Performance
Soiling measurements were conducted measuring both the short circuit current and nominal power before and after cleaning at irradiations of > 700 W/m2. The estimated soiling factor is in the range of 5% – 12% depending on the location at site.
The inconsistency of the azimuthal orientation leads to a mismatch loss of approximately 1.5%.
The amount and type of cracks, and cells in short circuit found in the selected modules during the electroluminescense inspection, reduce the nominal power of the PV plant by 2% – 4%. This statement bases on the extrapolation of the results of the sample measures.