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Avoiding a Voltage Spike With a 1-2 Battery Switch?

Question:

On my sailboat, I have a dedicated start battery and a (2) battery house bank. The start battery is on switch 1 and house on switch 2. If I need to motor for an extended period, how do I shift from my start battery to my house bank without risking a voltage spike as I move the switch to spot 1 to 2? - John

Answer:

Great question John, if your battery source selector switch is in good working, it’s got a make-before-break feature. In other words, when going from battery 1 to “both or all or combine” to battery 2, the switch is always connected to a battery even as it changes the state of the battery switch.

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?