Off-Grid Mini-Split, no Batteries?
I thought this may have been discussed somewhere before, but I can't seem to find it. Anyone have any experience running a mini-split offgrid without a battery bank? I currently power my cabin 100% with panels/battery bank/inverter. I got ahold of some extra panels and want to install a mini-split at my offgrid vacation cabin for the days that I'm there in the summer when it's really hot. Since those days are only when the sun is shining, I thought it would be easier/cheaper to set it up without a battery bank. I don't want to run it off my existing system, because I would have to upsize my battery bank (and I'd fear that my wife and kids would drain my batteries with the AC on high all day). My thought is to wire the new panel bank in series (up to 300+ volts), and run them straight to a separate grid-tie inverter (which is not wired to any AC input) that would be isolated to run the min-split. When the sun is out, it should power up the inverter (when panel voltage output is >220V) and then run the mini-split. When the sun is not out, the inverter would shut off (as well as the mini-split), but that's fine because I wouldn't need to run the AC when the sun is not out. This would only work if the inverter and mini-split auto turn on when DC power is present (I would want it to be self-sufficient, not requiring a manual "power-on" on the inverter and mini-split each morning when the inverter has DC input). What are your thoughts? Would this work? I'd like to figure out a way to do this without a battery bank (1/2 the cost, and no ongoing battery maintenance/replacement needed).
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