EVs have bigger capacity than my off-grid house. No way I could keep one charged while also trying to power my house. In the winter my standby generator has to kick on just to keep my house powered. It's not even a matter of adding more panels, just living in the mountains I only get so much sun in the shorter winter days... And that's if I have clear skies and without snow covering the panels
So you have the option to power an EV with solar+propane in the winter. I'm not sure if propane is cheaper than gasoline, but at least it has bulk home delivery and an indefinite shelf life.