[OvbiousError]

The numbers in the post are 2.2 and 3.6 kW. Even 2.2kW would cover virtually all of my use.

I don't want to buy a battery for the purpose because it doesn't make sense economically. If I could get a car with this functionality though for a similar price as cars without it, that would be a big bonus.

[vegardx]

I'm not going to pretend that there aren't edge cases and personal situations that would make it viable, but my initial comment was on consumers as a whole.

And we're talking about averages. So sure, if you have gas boiler you probably could get by with a 2,2kW or 3,6kW inverter, but just powering a simple kettle would likely trip a fuse. You can get around it with just being a little conscious about what you power up, and when you power things up, but I'd argue that most people don't want to deal with that.

And remember, if you're grid connected you either have to have a transfer switch or separate circuits if you want to use this as a backup when the grid goes down. It complicates things a whole lot.