Self Shading Calculator no impact

Hello,
SAM calculates self-shading losses differently for fixed arrays than for arrays with one-axis tracking.
UPDATE (OCTOBER 30 2015): AS OF SAM 2014.11.24 SAM USES THE SAME ALGORITHM FOR FIXED AND ONE-AXIS TRACKING ARRAYS.
As you know, for fixed arrays, the self-shading inputs are on the Array page. SAM calculates a DC derate factor to account for the reduction in the array's electrical output caused by self-shading. You can see the self-shading derate factor values in the hourly results. in SAM, self-shading for fixed arrays does not affect the plane-of-array (POA) irradiance values.
For one-axis tracking on the other hand, the self-shading inputs are on the PV Subarrays page, and SAM calculates a reduction in the POA irradiance incident on the array. You can see that effect by comparing the nominal POA irradiance to the POA irradiance after shading only in the hourly results.
Best regards,
Paul.

That is correct. The self-shading model for fixed arrays does not reduce the POA irradiance, so you should not expect to see a reduction in the hourly results. Instead, the model reduces the array's DC output, which is why you see values for the shading derate factor in the hourly results. That derate factor applies to the array's DC output, not to the POA irradiance.

Thanks,
Paul.

Dear masir,
Please see my reply to your other post:
sam.nrel.gov/node/69726
Best regards,

Paul.