Advice on Mixing Lithium Batteries and AGM Batteries?

Question:

Love your videos!! I have a cat with two alternators and 2 AGM start batteries.  I am adding Lithium house batteries. I am a liveaboard cruiser who anchors out for extended periods. Should I use DC to DC charger like the Victron Orion-Tr or a battery combiner like the Blue Seas IC-ACR? Should I have one for each alternator? Or should I have the start batteries connected together at a bus and then have a ARGODIODE battery isolator to the house bank? - Paul

Answer:

When mixing different battery chemistries, for instance Lithium for house and AGM for engine battery, a DC to DC charging converter is a good way to modify the voltage from one battery chemistre to what the other battery chemistry needs.- Jeff