I am more the theoretical / analytical type, and less the experienced one, but here's my comments :
AC
charger 12V 50A 1+1 : LeadAcid and
Lithium requires different charge algorithms and the voltage and the currents during
charging are different. Are you sure this unit can handle two different charge algorithms at the same time ? (I suspect that it can not). In my
boat I'm keeping the
current lead acid
charger for
charging lead acids, and I've bought two new 60A
Lithium chargers for charging the lithium banks (enables quicker charge time from a genny for instance). (They do take up some space though). On the other hand simply removing the red out to the lithium side will solve it (you loose some efficiency, but doesn't matter on shore power).
DC-DC charger 30A, on unconditionally (Thruster bank charger). In my
boat it starts charging when the voltage is above a set level, which is only reached when the engine (generator) is running or when on
shore power (from the AC powered charger). Maybe it can be configured ?.
I asume the Bow Thruster Lead Acid is an
AGM (bigger is better).
The battery charged by the
Alternator must be Lead Acid. BMS's can disconect the Lithum internally if the charge voltage is too high, and if all of them does that and your
Alternator is still running, and there's no other consumers to consume the
current it's generating, then you may get a voltage spike who may (will) fry all of your 12volt
electronics. There are ways around that, but it's easier to simply keep it Lead Acid there.
Switch between starter and start battery tends to cause resistance and start problems at some future point in time in my experience, so if you want that, go for a high quality high amp switch (the best you can find). (That's not in your drawing).
Do'no why the switch between AC charger output and start battery is there ? (sees no need for it).
Lithium charger on when engine is one ?,... why not as well when AC charger charging ?,....... probably triggered by voltage level in any case, so is o.k. as is from what the drawing shows.
You have drawn 125A
fuses, so then "all" of your
cables should be capable of handling 125A without getting too warm (something drawing exact 120 amps will never happen but), and a cable can handle some more than the rated amps without getting too warm. If you can manage your
consumption with a smaller fuse, you can use cheaper cable and save some
money. From Lead Acid to starter and to thruster use oversized cable (you don't want too much voltage drop there), and they're likely already there.
Smart Shunt : Is the
software there (and in the app) designed for Lithium ?,... should be. .....
Someone already talked about keeping the black/red
cables to/from the 4 lithium banks the same length which is recommended.
Just a philosphical comment (not from the real world) : You have a 125A fuse out from the lithium,..... lets now asume the
MPPT (solar) charger short circuits due to internal fault (not likely with
Victron though but), then you have aprox 12Volts and 125Amps = 1.5KW of heat which if on small spot can cause a fire. On the other hand, such a fault will 99.9% of the cases draw as much current as it can (and you have a supply of 4x125A), which will be more than enough to trip the 125A fuse, so you should be as safe as can be then :-).
Regarding
fuses on the
solar side my thoughts are that both the
MPPT and the cables can handle the max current the solars can produce, but does no harm. The risk is more from the 125A side, but fail to see a very likely case for that to happen (the one above is not likely at all).
2KW
inverter : 12V*125A is max 1.5KW ...... and all
electronics loose some of that in heat, so more likely max 1.3KW for your consumers. But a 2KW
inverter is likely more efficient at a 1KW
consumption than a smaller one, so just keep it :-). ... If the inverter AC output is connected to AC distribution then it will bite it's own tail, so you need to be able to turn off the battery charger maybe ;-). ........
That's all I could think of at the moment. But keep in mind that I lack the practical experience, though I do know how to use Ohms law which is what it's really all about.
With the best of intentions.