Impact on Performance
The severe cracks on module level account for approximately 4-6% of nominal power drop on system level. This statement bases on the extrapolation of the results of the inspected samples.
Soiling measurements were conducted measuring both the short circuit current and nominal power before and after cleaning at irradiations close to 800 W/m2. The estimated soiling loss of the nominal power is in the range of 4%-13% depending on the location of the analyzed module.
The PID effect is responsible for more than 30% of performance losses on system level. Individual module measurements showed nominal power drops higher than 80% in the most negative modules.