Stop in for a cup of coffee

Ehhh see I like the concept. Mainly cause it says FU to the utility companies. The thing is, adding them to an existing home doesn’t make sense. But right now, it’s nearly as cheap to go full solar, non grid tied as it is to have new grid lines ran to where I’m gonna build. And if I go geothermal with propane backup, I can pull it off for even less.
The catch is… can I run a 240V welder off solar?
Probably not directly. but seriously maybe. The trick will be not the voltage but the amp-hours. If your doing panels for the residential, that basically nominal 220 V across the two hots.
As far as I'm concerend the concept of electric panels is fine, the catch with existing buildings comes with roof installation when going with one of those lease deals. Since they front the cost and take a cut, your now in a relationship where if there's an issue with your roof, it has to be worked out. Not good IMO.

So just get a little 12 Volt deal hooked to some car batteries - you can then pair up a couple for some emergency arc welding.
:)