Allocating Capacity In Parametric for Different Subarrays

Hi Paul,

I'm working in the parametric section of SAM right now. And I don't see the "Strings allocated to subarray" input variable in the list. If it can't be specified specifically, how does SAM divvy up the capacity between each of the subarrays?

Best,
Nathan

Hi Nathan,

Not all input variables are available as inputs for parametric and stochastic simulations. For a PV array consisting of more than one subarray, the number of strings allocated to each subarray must equal the total number of strings in the array as defined by the "strings in parallel" input. The System Design user interface page checks that to prevent you from designing a system with inconsistent subarrays. There is not a way to control that for parametric and stochastic simulations, so we decided not to allow the variables to be inputs for those simulations. When you run a parametric or stochastic simulation, SAM sets the number of strings in each subarray to the values shown on the System Design page.

You can access those variables in LK script (subarray1_nstrings, subarray2_nstrings, subarray3_nstrings, subarray4_nstrings). Obviously, you have to be careful in your script to assign values such that the total number of strings is equal to strings_in_parallel.

Best regards,
Paul.

Makes sense. Thanks for the reply!