I have a 96 bago 30ft
I dropped my 8 AWG red/blk from panels , down the side of the shower vent pipe, it ended up in a small enclosure / cabinate/shelf there the converter.chg and power panel is located,
I mounted the controller under panel door. put solar feeds on a switched fuses, then to controller input, controller out put went to the extra lugs on my converter, as in this pic.. there was wire from the PD unit, one hot and one neg to the distri panel that also feeds the batteries,, I just landed the solar on the unused lugs
I used 12 foot of wire from the roof panels, to fuses, to controler, to pd unit..
Since I have 400 watts, to be 600 in spring,, that is about 30 amps not issue for the wires..
It charges my 3 105AH batteries fine,,