What is the peak power (in Amps) of the solar array?
Do you have circuits that are not backed up?
What is the peak power needs?
Depending on your local building code (Guam?), the busbar of the 200 A back up-panel and the 200 A generation panel may be limited by the
120% rule.
Depending on layout and existing constraints, You may either up size the busbar of your back up-panel and generation panel and/or de-rate the main breaker.