Are these homes not also connected to the grid? Or is there some technology that addresses these two issues that are in use in Puerto Rico?
These use a form of transfer switch like you’d use when you connect a generator- they disconnect the upstream.
I haven't read the OP link yet, but my guess is they are doing something like this: Grid, Solar and batteries.
You are also sort of conflating "loss of interconnect" with "outage'.
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