I don't live in the states, but I have a "home energy gateway" which is to say in human: a big switch that isolates my house, solar and batteries from the grid.

I think the generic term is "islanding" (could be wrong)

The downside of my system is that it takes a non-trivial amount of time to switch to island mode, which means lots of computer things reset during the process.

So you don't get 100% uptime, but you are able to carry on when there is an outage.