I figured out that I can go off-grid for about $1600.
That doesn't include solar panels, as I picked up a couple of used 295w panels a couple of years ago for $100-$150 each.
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Inverter and storage?
And charge controller!
300 Ah LiFePo battery -> $300-$350
4000 W Inverter -> $300-$330
50 A charge controller -> $170
The rest of the cost is 0000 size cables, bus bar, breaker (or fuse), and a switch, since I'll be moving batteties between their charging station and our home.