alt5180

I have been playing with Pitch E-W to find the best column spacing for a single axis tracker but it seems like only comes up with 0% near shading losses from Pitch E-W 3 meters to 6.5 meters where it jumps to 0.1% near shading losses I dont think its right, attach is what i have in the construction/ perspective window and when i run the shading table the albeo and difufse losses are 0 no matter what help?