ECN Forum Forums Code Related Discussion NEC & other Code issues Panel as a feed through 312.8 (Michigan)

I have been talking with the inspector and we are trying to figure out if this is legal. He has been great to talk to so nothing bad about this guy.

What I am doing is solar panels on my personal detached garage. I'm trying to use the existing conduit that feeds my garage 100a sub panel to get to the house and over to the meter, where POCO is requiring the disconnect within 6' of the meter.

To do this I'd like to go from the solar panels, to the inverter. Come out of the inverter with my 4 #8s enter the top of the garage sub panel, have the conductors pass through the panel going into the conduit that feed the sub panel and run that to the house.

Here's the questions. (2017 code btw) I feel 312.8 says this is legal as long as I meet the following 3 requirements.
#1 & #2 talks about not overfilling and both these don't seem to be an issue in my install.
#3 Says a warning label needs to be applied to the enclosure identifying the disconnect location.
Do we agree this is a legal install?

The 2nd question the inspector asked me and I didn't even consider because I assume its legal is about the sub panel feeds coming from the house and the solar panel feeds coming from the garage in the same conduit. As if the 2 feeds going in the opposite directions and from different sources would be an issue in the same conduit. My answer was this is happening in commercial settings with multiple circuits and switch legs running in the same conduit.

Can I get some thoughts and verification on this being NEC compliant or not?

I wouldn't write it up if the panel was neat and there didn't seem to be any crowding around the conductors that are integral to that panel. Usually there is plenty of room if you do the math. I have seen some old panelboard enclosures that are tight, even with the conductors the breakers support.