AC300 to DC Converter

I want to wire in my new AC300 to my RV DC circuit and using the 30AMP RV plug for the AC components. I plan to replace the battery with the AC300+B300. Currently, there are three power cables going to the battery compartment - a 10 gauge 30 amp wire for the 12v fridge, a 10 gauge 40 amp surge protected wire for the 12V system which feeds into a converter. I ordered the 12V RV cable to connect to the 12V system but considering this cable is supposed to both receive power from and charge the battery what will happen if i connect this to the front of the AC300? can that port receive and provide power or do i need to isolate the output from the input and wire them separately?

@tom2
I consulted the tech team based on your questions.
They don’t quite understand how you can charge and discharge using RV cable? Can you draw a schematic (rough draft) diagram for our better understanding?