Unless you go completely off-grid then rooftop solar isn’t going to help with outages as they are turned off during outages to protect electrical workers and the power grid. [1] Your problem can be solved with home batteries.
1. https://www.paradisesolarenergy.com/blog/will-solar-panels-w...
Tesla's PowerWall is more capable than some, but I've heard nightmare stories about working with Tesla customer service so I stayed away from that one, even though technologically it's probably the most advanced.
Might even be illegal, depending on jurisdiction. For good reasons, you could kill electricians working on the local grid or firefighters working on your house if you're not careful with the install and adding local shut-offs.
My battery turns off when the grid goes down, but it has 3 outlets directly on the body of the battery, and those always work. I run extension cords from those when the power goes.
That misconception is now 15 years old
For an "auto island" functionality, I would need relays controlled by the inverter on all 3 phases between the electricity mains and my main switch box, right? I don't have relays like that.
Add another battery and bigger inverter and you can double that. Unless you've got a kiln or perpetually running hot water heating, I'm left baffled.
Though apparently there is a thing called a "softstart" that can be installed to mitigate this.
I don't actually know anything about this stuff. I just watch youtube videos.
So unless there is something magical about electricity in the USA, I'm not sure where this scare story is coming from.
I have one of these https://www.sunsynk.org/ourinverters