My designer originally had a 100A. Had a 3 way phone call about this. Stated something about generation, 120% something and NEMA code. The panel is 200A and has 2- 100A now for the two sub-panels.Let us know what they say about this. Mine is also 150 amp and I questioned this after the fact with no response.
I just don't see it though and cannot debate it on the phone. But, he settled for 150A. In reality I doubt I could have such a load if everything is on. 28,800W at 80% of breaker.
The 3rd party certified installer was going to use a 200A break in the main panel.