REC245PE PV Module PAN Report

REC Solar US LLC | REC245PE PAN FILE DEVELOPMENT REPORT
BLACK & VEATCH | Conclusions
3-7
Table 5 compares the Base Case efficiency curves to the optimized efficiency curves. The RSS
deviation between the optimized and measured curves is 0.23% after the optimization process,
showing a reduction in deviation by approximately a factor of eight from the Base Case. The
optimized PAN file energy production was compared to the expected measured energy production
by using temperature and irradiance weights derived from the Las Vegas Test Case. The difference
in expected performance between the measured curves and Optimized curves is -0.35%, a
reduction in deviation by approximately a factor of ten over the Base Case.
Table 5 Optimized PAN File vs. Base Case
REC245PE
ROOT SUM SQUARE (RSS)
DEVIATION FROM MEASURED
EFFICIENCY CURVES
ENERGY PRODUCTION
DIFFERENCE FROM LAS VEGAS
TEST CASE*
Base Case
1.94%
-3.69%
Optimized
0.23%
-0.35%
* A negative value indicates that the Revised PAN file under estimates
performance.
3.0 Conclusions
In summary, Black &Veatch found that the Base Case PAN file (pre-optimization) created from the
module datasheet and PVsyst default settings resulted in efficiency curves that did not accurately
represent the expected measured efficiencies of the modules. The Base Case efficiency curves had a
corresponding root sum square (RSS) deviation of 1.94% from the measured data. For the Las
Vegas Test Case used to assess accuracy in modeling actual production, the Base Case PAN file
underestimated energy production at test conditions by 3.69% when compared to measured
efficiency curves. With the optimized PAN file developed by Black & Veatch, the magnitude and
shape of the efficiency curves are more accurately represented, lowering RSS deviation to 0.23%
and reducing the difference in energy production to only 0.35% below measured efficiency curves
for the Las Vegas Test Case.
Note to PAN file users: This PAN file was derived from pre-LID laboratory measurements,
therefore an additional loss for LID must be factored in to the Module Quality Loss estimate
within PVsyst.