Curious, the left-most box doesn't look like a normal Gateway, is that really what it is? Main difference is the lack of antennae on the top, do the two boxes share a Neurio or something?
Comparing to my (California) installation, I'm guessing that Backup Gateway 1 is what's called the "generation panel" in my case. It has the breakers for the Powerwalls and solar in it and feeds into the Gateway. This actually looks quite similar to my installation except I only have one solar inverter and none of the cutoffs.