I live off grid and only have solar because it was cheaper than the wire.

Also, I built it myself so the labor costs aren't included but I am about $8k into a system (4kw of panels, 6kw inverter, 15kwH battery).

I personally wouldn't be able to make vehicle cheaper than having no grid tie. I get that the costs are different once you include labor. Also I am on 40acres so the panel set could be ground mounted.

But to make something commensurable with a propane home-powering generator seems a lot more do-able.