Not off grid, but a 10kw grid tied solar install I did for a neighbor last year. We used Hyundai 250w panels and Enphase micro inverters. Frame is 2" galvanized pipe welded on site, with 2x2x3/16ths galvanized angle across the pipe frames for mounting the panels. Hope you enjoy ! Made a big wood "square" to get the panels starting off good and square to the racking.