Won't an EV have maintenance costs too? And cost a lot more than a propane generator? And take time to switch over to supply electricity to your house?

The quiter part makes sense, but there are a lot more practical solutions to that too.

You (probably) need a car any way. So the choice isn't between an EV or a propane generator - it's between an EV, or (propane generator and a car). With V2H and something like a power wall or other battery backup, when the power goes out you would still have a few hours at normal usage where you can go and plug your car in.

Always a good idea to have a UPS, even if you don’t have a generator, to protect your home computers from transient outages, power flickers, or grid voltage fluctuations.

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.