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I want my microHD - Inveter is dying fast.

Actually looking at the Air 40, the 3.7 would be good if we were on grid, but otherwise can cause more headaches - what do you do when the wind is not blowing? DC works better if you plan for it. AC was promoted to share or move (dare I say "transmit" on a sat guy site) power over distance. DC has more torque.