MPPT Inputs

This one inverter I chose has 16 MPPT inputs but SAM won't allow me to input that.  Is there a solution to this issue?

Hello,

SAM can only model up to four different maximum power point trackers (MPPTs). Modeling multiple MPPTs allows each subarray to operate at its own voltage when subarrays have different string lengths, orientation, and/or shading. This is a limitation of the current version of SAM and on our wish list to fix:  github.com/NREL/SAM/issues/1700 .

When you model a system with multiple subarrays and a single MPPT input. SAM calculates the inverter input voltage in each time step as the average of the subarray voltages. (Or, you can check the subarray mismatch calculation option at the bottom of the System Design page to calculate a more accurate estimate of the inverter input voltage.)

If your system design involves four or fewer groups of modules with different string lengths, orientation, and/or shading, you can assign each group to a subarray and associated MPPT input. Otherwise, if the approximation of a single MPPT input is not suitable for your analysis, you can approximate the system design by assigning groups to the four available subarrays and MPPT inputs.

Best regards,
Paul.

Thanks