Boat (3 agm batteries ) + LIFEPO batt ( sollar + alternator ) dual outboard motors

DIY
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1

Hello

Can anybode advise it this is possible and how to do it ?

So we have 2 outboard motors, and 3 agm batteries

1 engine alternator is now charging 1. agm - on this batt is connected el winch, electric starter for 1.engine , and also is charging third agm for bow thruster

2 engine alternator is now charging 2. agm - on this batt is all other stuff like plotter , fridge, lights , music and so on…

There is also one charger with 3 outputs when boat is on shore power…

So i have idea to put sollar pannel on roof around 300 watts, and add one more big (service) battery , LifePo.

Idea was to leave 2.agm batt only for motor starter and connect all other electronic to lifepo batt… put dc dc to lifepo batt and find some victron device

for solar pannel to charge all other batteries…

does anybode made something like this and does it have some shematic ?

what is your advice for this kind of connection ?

2

In this case, I would centralise all the “house” or service batteries and loads.
Maintain individual starter batteries for each engine /alternator.
Then use an automatic charge relay (ACR) for each engine to the house battery.
Manual switch to bridge engine starter batteries in the event of a low starter battery.
Solar charging house battery.
If / When the solar charges the house battery above 13.8V, this will cause the ACR’s to engage and charge the start batteries.