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Default IAM Values in PVsyst Are Non-Physical
https://forum.pvsyst.com/viewtopic.php?f=12&t=4474
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Author:  kjs55 [ Fri Jun 28, 2019 11:34 pm ]
Post subject:  Default IAM Values in PVsyst Are Non-Physical

PVsyst V6.81
1. Glass refractive index (n) appears to be 1.526, not 1.53 as shown in Hidden Parameters
2. It does not appear n=1.37 for EVA (in Hidden Parameters) is used for "Normal glass" or "AR coating" scenarios
3. With the following assumptions, I get the same results as PVsyst:
--No ARC
--Glass n=1.526
--No refractive index applied for EVA
AOI IAM_PVsyst IAM_kjs55
0 1.000 1.000
30 0.998 0.998
50 0.981 0.981
60 0.948 0.948
70 0.862 0.862
75 0.776 0.776
80 0.636 0.636
85 0.403 0.402
90 0.000 0.000
4. With the following assumptions, I get slightly different results than PVsyst:
--ARC n=1.29
--Glass n=1.526
--No refractive index applied for EVA
AOI IAM_PVsyst IAM_kjs55
0 1.000 1.000
30 0.999 0.999
50 0.987 0.987
60 0.962 0.961
70 0.892 0.889
75 0.816 0.811
80 0.681 0.674
85 0.440 0.433
90 0.000 0.000

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