Hm.. The reason why I was planning to have different orientations in parallel instead of equal orientations in parallel is the fact that there is a lot of vegetation and neighbour houses around. Theres always a high chance that one of the modules is partially shaded. https://lh3.googleusercontent.com/drive-viewer/AFGJ81oXWG-T_teJULXYBzwmHPqqbvxaiwiTMceNz-wTFy8IklCkVAoZnEVBKoqn4s5TrCqtb6UEmPM-8D2-B2Kjoa5WPexLtQ=s2560
SAM assumes that all strings in a given subarray operate at the same voltage, so the modules in the subarray must have the same orientation, and the strings in the subarray must have the same number of modules.