I have four gc2 6 volts running to a blue seas battery selector switch. I can run on battery bank 1 or 2 or both. Both of these banks have a common ground that runns through a shunt that talks to my Bogart engineering Trimetric. The blue seas common terminal then runs over to a copper buss bar that has fuses for everything. The solar control, Quick Charge brand battery charger, converter/house, Meanwell power supply all go there. That's why I mentioned the trimetric to you previously. If I want to know how many amps I'm drawing at any time I disconnect my solar panels with another blue seas battery selector switch and I can see the amps that are passing through the shunt. If I turn on my house converter I can see how many amps are going into the batteries. If I use my Meanwell it will show amps in. If I run my house converter and my Quick Charge or Meanwell, I can see the total amps they are both putting back.
It sounds like you need to draw out and build your system on paper and leave room for future expansion. If you search member solar builds there are a couple pics of my home brew buss bar heavy fuses and small fuses. I cant look at it now but if nothing else I'll get better close up pics for you. It's not exactly how I would recommend doing it but it will give you ideas. I built it with stuff I primarily had on hand. I like the fuse holder posted above for the small stuff, very clean.
The bottom line is that when you are used to operating your rig all you need to know is battery volts. If you want to see everything and use it as a tool and just to learn and fully understand your power system, a battery monitor is a great thing.
Naio, you say you have 2 banks? 2 banks of 24 volts? I dont recall all your posts.