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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

House Battery + Starter Battery + 2 Battery Monitor Shunts?

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House Battery + Starter Battery + 2 Battery Monitor Shunts?

I Am Adding a Second Battery, Should I Use a Battery Combiner or a Battery Isolator?

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I Am Adding a Second Battery, Should I Use a Battery Combiner or a Battery Isolator?

Battery Charging Redundancy with a Battery Isolator

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Battery Charging Redundancy with a Battery Isolator

If I Have Three Battery Banks Do I Need Three Battery Monitors?

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If I Have Three Battery Banks Do I Need Three Battery Monitors?

My Battery Charger Has Three Outputs, Can I Connect Them All to One Battery to Charge Faster?

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My Battery Charger Has Three Outputs, Can I Connect Them All to One Battery to Charge Faster?

Can I Use One Alternator to Charge an Flooded Lead Acid Starter Battery and an AGM House Battery?

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Can I Use One Alternator to Charge an Flooded Lead Acid Starter Battery and an AGM House Battery?

How to Charge a Lithium Battery House Bank and an AGM Starter Battery at the Same Time?

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How to Charge a Lithium Battery House Bank and an AGM Starter Battery at the Same Time?

Why You Can't Use a Starter Battery as a Deep Cycle House Battery?

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Why You Can't Use a Starter Battery as a Deep Cycle House Battery?

Can You Explain Battery Capacity and Battery Voltage?

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Can You Explain Battery Capacity and Battery Voltage?

The Role of a BMS (Battery Management System) in A Lithium Battery Bank On My Boat

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The Role of a BMS (Battery Management System) in A Lithium Battery Bank On My Boat

Should My Battery Isolator Have Diodes or FETS?

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Should My Battery Isolator Have Diodes or FETS?

How Do I Charge The Generator Battery on My Boat?

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How Do I Charge The Generator Battery on My Boat?

What Is the SI Post for on an SI-ACR Battery Combiner?

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What Is the SI Post for on an SI-ACR Battery Combiner?

IT ISN'T BROKEN! Why Your Battery Monitor Is Not Wrong! PYS Tech Talk

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IT ISN'T BROKEN! Why Your Battery Monitor Is Not Wrong! PYS Tech Talk

How Do I Charge a Lithium House Bank and a Lead Acid Starter Battery With My Alternator?

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How Do I Charge a Lithium House Bank and a Lead Acid Starter Battery With My Alternator?

Using A Battery Switch While the Boat is Running - Good or Bad?

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Using A Battery Switch While the Boat is Running - Good or Bad?

How to Monitor Lithium Battery State of Charge Without Bluetooth

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How to Monitor Lithium Battery State of Charge Without Bluetooth

Does a Battery Combiner Draw Current When No Charge Is Present?

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Does a Battery Combiner Draw Current When No Charge Is Present?

What Is the Depth of Discharge for My AGM Battery?

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What Is the Depth of Discharge for My AGM Battery?

I Purchased a 3-Output Battery Isolator but I Only Need 2 Outputs - Can I Leave One Unwired?

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I Purchased a 3-Output Battery Isolator but I Only Need 2 Outputs - Can I Leave One Unwired?