Part of my van system.
Full system after a victron schematic.
Just with 3x200ah batteries instead of 3x300ah.
Will ad on another mppt when fund’s are available… 
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Hi, I found this that would good for your battery terminals too:
Blue Sea 4017 Straight Terminal CableCap
Great to see your system. very nicely made.
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“I have a question about grounding 230V and 12V systems. Did you ground the 230V, and did you use the same grounding point for both? If yes, could you provide more details? Thank you.”
Hey Zoran!
If you look at this schematic you can see how I grounded the system.
The ground from multi plus ( green cable ) goes from multi plus to my negative busbar.
And my lynx distrubator (green cable) is grounded to the chassi of my car.
Hope that helps.