Installing 22 panel, roof mounted system using REC245 panels and Enphase 215 micro-inverters. System is utility interactive. AC combiner box will be inside barn that panels are mounted on. From there, I have approx 290' to interconnect point. After doing voltage drop calculation (based on 20A load), I'm looking at #1 AL wire. 1. Does the code allow me to undersize my neutral conductor for this application? Also, my understanding is that I have to proportionally up-size my egc (which would be #12 cu for 20A circuit), but I'm not quite sure how to calculate the new size. Finally, looking at 690.47(A). Do I need to install a new g.e. system at the array site? If so, how is that most efficiently accomplished. Hope these questions make some sense. I'm relatively new to the industry (as well as being newly licensed), so my head is swimming a little.