Sorry to hijack / revive this thread, but I have a similar mission and setup (48X 100Ah Fortune, 6X JBD BMS but not the Overkill model, 2X MPPT, SmartShunt, 2X Orion Cerbo GX) and am hitting a similar wall: How to efficiently (i.e. not going overboard in terms of complexity) yet safely connect the whole lot?
I don’t have a diagram but let’s see if I can bring across my intended setup like this:
Solar panels —> MPPTs —> DC Pos BusBar —> Charger Switch —> Breaker—> Multiplus —> Battery Switch —> ANL* fuse 200A / 32V (should be good for 400A @ 12V, no?) on positive and SmartShunt on negative —> BusBar(s) —> BMSs + batteries (all inter-fused with 200A fuses) and Cerbo GX.
And then also starter batteries connected to Multiplus with an Orion DC-DC and a dedicated Starter Battery / Alternator charging switch.
*Yes, I know it should ideally be Class-T, but they are very hard to find in Europe
There will always be a better setup, I know, but for now, will it work? I need to move my boat to a place where I can work on it a bit more (12 hour sail) and currently have zero power so need a quick and safe working setup ¯\_(ツ)_/¯