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Use "combine switch" to charge 2 batteries

Old 10-31-2019, 07:01 AM
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Default Use "combine switch" to charge 2 batteries

Hello,
Let me start by saying that my knowledge on this topic is limited mostly to what I've read on the HullTruth.

My understanding, which of course may be challenged, is that if one wanted to charge 2 batteries with a single bank charger the batteries could be wired in parallel (assume both batteries are identical). Does an OFF/ON/Combine battery switch act as a way to run the batteries in parallel? If so, if the single bank charger is connected to one of the batteries when the switch is turned to "combine" will it charge both batteries?

Thanks in advance for sharing your knowledge.

Old 10-31-2019, 07:21 AM
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Two 12 volt batteries that are to be charged by one power source are connected in parallel. Type of lead acid battery, its size or state of charge, does not matter.

That is exactly what putting a battery switch on the both position does. Perhaps some switches are labeled as combine. There is little standardization in the marine industry as I see it.

It does not matter to which battery the power source (charger in your scenario) is connected. Electrically it is one and the same.

Be very, very careful of the information that you read here. Check and double check it on your own using other authoritative sources. The innerweb has made it so very easy for folks that don't know there ass from a hot rock, but who can speak and type very effectively, to widely spread crap information.
Old 10-31-2019, 07:25 AM
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There is no requirement for batteries to be identical when connecting in parallel. Obviously they should both be 12 volt batteries and if they have different optimum charging profiles you may have to select a charging profile that doesn't offend either battery.

Yes the "BOTH" setting on a conventional OFF/1/BOTH/2 switch will connect the batteries in parallel, usually for the purpose of assisted starting power in emergencies.
Using "BOTH" for charging both batteries is a common practice however it tends to defeat the isolation purposes of the switch function. Manually turning to BOTH when the motor is running and back to 1 when off is fine if you remember to do it. A Battery Combiner will do this automatically.
Old 10-31-2019, 07:51 AM
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Good advice on what to trust and the source. Thanks for sharing.
Old 10-31-2019, 10:58 AM
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Originally Posted by yandina View Post
There is no requirement for batteries to be identical when connecting in parallel. Obviously they should both be 12 volt batteries and if they have different optimum charging profiles you may have to select a charging profile that doesn't offend either battery.

Yes the "BOTH" setting on a conventional OFF/1/BOTH/2 switch will connect the batteries in parallel, usually for the purpose of assisted starting power in emergencies.
Using "BOTH" for charging both batteries is a common practice however it tends to defeat the isolation purposes of the switch function. Manually turning to BOTH when the motor is running and back to 1 when off is fine if you remember to do it. A Battery Combiner will do this automatically.
Therein lies the problem. Thus the need for a Yandina Combiner.

Yan never forgets.
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Old 10-31-2019, 09:02 PM
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Buy an acr.
Old 11-01-2019, 03:56 AM
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Old 11-01-2019, 06:47 AM
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Originally Posted by alloyboy View Post
Therein lies the problem. Thus the need for a Yandina Combiner.

Yan never forgets.
I have a leave the dock checklist that includes going from both to one of the batteries, so I generally remember. The Yandina assures that while running on battery 1 or 2 the other battery will still bet charged.
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