First, if there is a high charge rate selected for the inverter/chargers the shore power circuit will be overloaded if the bus is running other heavy loads like ACs etc. Check for power at the outlet.

I suspect a high draw popped the shore power breaker. That is why I suggest setting the charge rate based on how the bus is used.

If there is power at the outlet, the breakers cannot necessarily be visually checked for tripping if the ones in question are the big red ones. Also those big red ones are usually for DC. They cannot be pushed in with your thumb unless you are very strong. I have to use a screw driver. The ones in the front top of the first bay may be OTR breakers. This is a hard place to diagnose without photos.

Paul....always start at the beginning when looking for a problem such as the outlet and follow it until the failure is located.