200A Main Service Panel - 10kw Grid Tied System?

[JCSchwarb]

The set of projects that can take advantage of R328.2 is limited.

It's uncertain which AHJs will approve the repurposed batteries. If they ask for engineering that will inflate the project cost.

Also those are HV batteries, not as many DIYers will want to try to use those.

In general I read this code as method around the certification process since you are isolating an unlikely failure away from the living quarters. The easiest way would be get an aluminum trailer on wheels and make that your power generation that is self contained and not part of inhabited space.