iopalinsky Posted October 11, 2013 Share Posted October 11, 2013 Why are we limited to just 9 points for a custom IAM profile? Creating an IAM profile with just nine points seems to be a little buggy, and can result in some funky curves, even if the chosen points are valid point on the IAM curve. Link to comment Share on other sites More sharing options...
André Mermoud Posted October 14, 2013 Share Posted October 14, 2013 PVsyst performs a cubic interpolation between points. That is, for a value situated between point #2 and #3, it adjusts a cubic function on the points #1, #2, #3, #4. This allows to represent quite well a curved profile, especially a smooth one like the IAM behaviour. 9 points are largely sufficient in this case.However in some cases the "external" point (#1 or #4 in my previous example) gives artefacts like in your example. You can avoid this by displacing the point #8 to a higher angle value (and lower IAM value), or suppress one of the points #4 or #5 (which are quasi useless) and add a point between #8 and #9. Link to comment Share on other sites More sharing options...
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