In the analysis of the Richelbach data, Section 1 with REC Premium panels w The NREL filter was then applied to the remaining three REC Peak Energy Series sections in order to pre-process the measured data and then the calculated value of r with respect to time (per day) was where the intercept shows the initial degradation and the slope
indicates the panel degradation rate. It should also be noted that in the monitoring of a power plant like Richelbach, DC power is usually measured for the total strings of
panels (to an inverter), not for a single panel. So the degradation rate derived in such a case is the average value for multiple panels. Taking the losses through panel mismatch and soiling into consideration, the degradation rate of single panels can be considered ev the results calculated.