Because the engine in my boat has been replaced with a larger one, the alternator has also become larger. From 60 to 115 Ah. I have already posted another question just above about the effect this has on the charging current.
There is currently a Victron Argofet 200-3 200A behind the alternator, which distributes the current to 7 batteries: 1 starter battery, 50Ah; 2. service battery bank consisting of three batteries, 3x 125Ah. 3. To the bow, where there is a Crystec battery isolator (diode) that distributes the current again between 1. battery for the anchor winch, 100Ah; 2. two Yellow Top batteries connected in parallel (1 x 75Ah and 1 x 55Ah) for the bow thruster and the Furlex.
The 3 service batteries have died and I want to replace them with 1x 200Ah Victron lithium battery. However, this has a different charging cycle from an AGM battery and I understand that I therefore need a DC-DC battery charger. This should then be installed behind the starter battery. If you also want to connect the shore power charger to your lithium batteries (with a charging cycle adapted for lithium), then the other batteries will only be charged by the alternator.
A. The question also arises here as to whether the 115Ah alternator will not supply too much current to the other AGM batteries, and whether a “limiter” should be installed between them as well?
B. Have I described the above correctly, or am I overlooking something and do I need to make any other provisions?
C. I have also noticed that there are no fuses installed anywhere, except from the service batteries to the consumers. Should fuses also be installed in one place or another for protection?
The attached drawing shows the current situation.
