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Unirac’s Ground Fixed Tilt vs IronRidge (GFT) which is best for DIY? Thanks

Has anyone had any dealings with SunWatts? Their HQ is in Cleveland, OH. Their equipment prices seem to be a little too good, and that makes me worried. I can't find any reviews on them. I'm looking for a solar equipment supplier who specializes in DIY installation. I need some help on design...

I just purchased a Sol-Ark 12, they seem to suggest using a multi-circuit transfer switch instead of adding a critical load panel. What is the advantage? The electrician today quoted me $845 materials and $85 an hour to install a multi-circuit transfer switch, is that a reasonable price? Thanks

The Alt E Store wants $1645.00 more for the EMP hardened model, is it worth it? I would like to use lithium batteries, would I need to put them in a faraday cage? Thanks

I am using PVWatts to establish the best degrees of tilt for my 10.2k array (Grid tied/Battery backup) I am about to install. Our latitude 35.45 deg. (Arkansas) according to them. Our area averages 16 cloudy day a month for December through March. Their KWh per year were almost the same of 30...