Hi Miles,
Thank you for the feedback.
That label is incorrect. It is the short circuit current (Isc) of a single string in Subarray 1 rather than of the subarray Isc. You can calculate the subarray Isc by multiplying the "Subarray Isc" by the number of strings in the subarray.
I have create an issue on our GitHub repository for this so we can fix it:
github.com/NREL/SAM/issues/562
Would you mind telling us how you are using this value? What would be the best value for SAM to report?
Best regards,
Paul.