The company I lease my tower to at the top of the mountain asked me about a backup power supply for the occasional grid outages we have (had one Thursday for about 3 hours) to make their service better. We don't have a lot of outages, but the line that comes up our road (which dead ends at my place) seems to get hit by tree limbs slapping the line 4-6 times/yr, popping the breaker out where the 3phase line ends down in the valley. We seem to be the last ones they come reset the breaker, so 2-6hr outage is not uncommon. Unfortunately, that doesn't endear the customers of the ISP, who now number several hundred getting service thru my tower. (including me...... ) I started to do a fairly simple battery backup UPS kinda thing, but I could use more off grid (or behind the meter as the power company calls it) to run not only the tower, but my hoop house and part of the shop (a small part)....so I'm doing a more complex setup, but in return for their part of the cost, they will get a LOT (like days) longer backup power set up than what I previously proposed. Just redid the siding on the shop, replacing the southeast side, and painting all of the building. I put metal up where the new solar array is going, and this week worked on the 1 1/2" galvanized pipe frames. I came out from the shop wall about 18".....pipe is secured to the wall with flanges and 4 screws thru the metal into the 1" sheathing underneath. Bottom is set in concrete, the panels will mount on 3/16" 2x2 galvanized angle (which I know OP4 says is stupid, but I like the nice solid feel of angle welded to pipe...your mileage may vary). Array will hold 18 panels of 320w each when done. I'll post along as it progresses.