So if you want the big lever, then a 125A generation panel in the garage that has (3) 30A Powerwall breakers and (1) 35A PV breaker makes a lot of sense. And then there's no need for the interior panelboard in the TEG2.Option 1: Ask them to make a generation panel that feeds the TEG2 internal panelboard. But if they use a panel like this; why wouldn't they just put the 3x 30A and 1x 35A double poles into it? Then I could plug this generation panel directly to the bottom lugs on the TEG2. I'm trying to understand the benefit of putting only the Powerwalls into a sub panel and then running the 35A separately onto the TEG2 internal panelboard.
A generation panel with everything in it will also provide the benefit of piping through a big-lever-switch outside of my house. This way the inspector sees the big lever (can't claim glove-hands!) instead of BR style breakers.
But if you're willing to forego the big lever, then you can replace the big lever with the TEG2 interior panelboard with a single 125A breaker. That becomes your shutoff.
Or the TEG2 interior panelboard could have a 90A and a 35A, and the garage generation panelboard could be Powerwalls only. Then you have two shutoff breakers in the TEG2. It's just a question of whether you'd like the feeder for the Combiner to originate from inside the garage, or from the TEG2.
Any of those will work.