Odd behavior / unexpected results- increasing tracker spacing (to infinity) continues to increase energy

[Pete]

Background:

I built a simple single inverter model to investigate energy vs tracker row spacing.  In all cases, I kept the array consistent and only increased the tracker spacing in increments of 0.25M.   I expected to see that annual energy would plateau at some point and not increase, indicating the MAX optimum space.  There is more to my analysis but, this is the background for the issue at hand.  As I increased from 6 through 8.5 meters, energy continued to increase.  I then jumped to 50 meters and the trend continued!  Similarly, I used 100M and the results continued to climb. 

I have no HV transformer or other losses and the consistent system definition below: 

[Michele Oliosi]

Hi, I would suggest looking at more variables. I strongly suspect that the dominant loss factor is the losses on the diffuse component. These will have a less sharp decrease than other losses, especially in the case of backtracking, which zeroes-out the direct shading losses.

You can take a look at ShdDLss and ShdALss.

[dtarin]

This doesnt look off but not enough info here. The difference between 100m and 50m is .07%. Between 8.5m and 50m, energy plateaus. Since you havent included those simulations, it looks linear there. 

Edited 2 hours ago by dtarin