SAM help says the field "Rated system size" is calculated using the formula:
Nameplate Capacity = Total Collector Area × FRta - FRUL × 30/1000
Total Collector Area = 8.968
FRta = 0.057
FRUL = 2.7
and calculate answer to be 0.430176.
SAM calculates -0.215232 and fails to run simulation. I get error messages. Please fix.