Hi,
Yes. You can use the 3D shade calculator to calculate an hourly (8760 hours/year) beam shading factor array for each of the two subarrays. As you suggest, create an active surface for each subarray, and assign a subarray number in the 3D shade scene properties. When you close the 3D shade calculator, ignore the messages about the number of subarrays.
Then, in SAM, for each subarray, click
Edit shading and disable the
Enable partial shading model option. That will make the
Strings in Subarray input disappear, and SAM will model the impact of shading as a reduction in irradiance without applying the empirical partial shading model. That model is for string or central inverters where shading affects the output of the entire string.
Best regards,
Paul.