I'm now grid tied, after 28 years off grid on different property, but here is how I do it: my own rack design, I've built over 50 of them, no failures. This is my latest array, 12 250 watt modules, bought used from SANTAN Solar, just yesterday I saw a 3600 watt output, so still "good as new" and a whole lot cheaper! I put this up in anticipation of using more power due to a recent buy of a RAV4 Prime, a plug in hybrid. All winter long I had the rack at about 80 degrees, steeper than my sun angle, but with snow on the ground I get a double refraction thing happening, plus the snow slides off better of course. This was yesterday's re-setting to about 45 degrees, in June I'll go almost flat. It's all balanced, and the small comalong and rope on each side was just because it was really windy.
Very simple, one hole, with the pipe directed embedded in the concrete, no rebar or sono tube required or used. Copper ground wire in the whole first, just fill the 6' deep hole about halfway first, then use your 30 ton boom truck (if you don't have your own, like I do, a medium size tractor with a front end loader would work, or call a local boom truck guy) then the 8" sch. 40
pipe is briskly lowered into the center of the hole (and the hole is small in diameter as possible, no need to go bigger) and the pour is completed. NOW the pipe can be plumbed, with the still fluid concrete still being able to give, tamp the mud with a long rod, and/or beat on the junk yard pipe (half the cost of new, just as good) with a sledge first to consolidate the pour, check for plumb again, and that's it. No fancy bracing needed, no careful pouring of the concrete around a previously positioned and braced pole, no critical alighning of mutiple small poles, simple and effective. Then the array was lifted with the boom truck, panels on and wired, and set into place, the channel captures the pipe, 4 5/8" dia., u-bolts ensure nothing moves.
I had to quit making these for others, when the local e inspector complained that they were not something called "engineered", and "an approved solar module mounting system." Forget the fact they saved my customers a lot of time and money, as compared to ordering approved mounts via motor freight, assembling them piece meal on site, and only then mounting each module individually. These were all built in my shop, at a level, safe and comfortable height, and they didn't involve multiple trips out to a jobsite, hopefully when the weather was good.