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Jan 23rd, 2013
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Charger and batteries in parallel #12401981
08/26/17 01:35 PM
08/26/17 01:35 PM
Joined: Jul 2008
Posts: 3,007
Abbott, TX
J
joho5 Offline OP
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joho5  Offline OP
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J

Joined: Jul 2008
Posts: 3,007
Abbott, TX
If I have a two bank charger, can I run one bank to the starting battery and the other bank to 2 or 3 batteries that are wired together in parallel 12v?

Re: Charger and batteries in parallel [Re: joho5] #12402065
08/26/17 02:50 PM
08/26/17 02:50 PM
Joined: Aug 2009
Posts: 1,629
Richland-Chambers
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Capt Craig Offline
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Capt Craig  Offline
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Richland-Chambers
No. Each battery has to be connected to its own charging bank.


Capt. Craig Copeland
Licensed by the US Coast Guard

2019 Nautic Star 215 XTS Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
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Re: Charger and batteries in parallel [Re: joho5] #12402078
08/26/17 02:58 PM
08/26/17 02:58 PM
Joined: Aug 2011
Posts: 2,847
Austin, Tx
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Bob Landry Offline
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Bob Landry  Offline
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Austin, Tx
The charger will see it as two 12V banks, but you will probably get uneven charging with the different charging rates and characteristics of the two banks. Bottom line is yes, it will work.


2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115

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Re: Charger and batteries in parallel [Re: joho5] #12402085
08/26/17 03:02 PM
08/26/17 03:02 PM
Joined: Feb 2010
Posts: 10,758
Lewisville Tx.
shut-up-and-fish Offline
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Lewisville Tx.


I would hook up the two bank charger to your two trolling motor batteries and then charge your starting battery every once in a while with a portable charger.

A 3 bank charger would be the proper thing to have for your set up.




https://www.minnkotamotors.com/Support/F...-charger-bank-/




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Re: Charger and batteries in parallel [Re: joho5] #12402141
08/26/17 03:36 PM
08/26/17 03:36 PM
Joined: Jul 2008
Posts: 3,007
Abbott, TX
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joho5 Offline OP
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joho5  Offline OP
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Abbott, TX
Here's what I have. 4 batteries and a 12v system. But three batteries are wired 12v for trolling motor. And then there's a starting battery. Just bought the boat like this. I don't want to buy a 4 bank charger. The pro mariner dedicates Amos where needed so I thought that may be the way to go. So when starting battery is charged, then the amps will be dedicated to charging the 12v "bank" of three batteries wired together. They are all the same exact battery.

Will this work?

Re: Charger and batteries in parallel [Re: joho5] #12402209
08/26/17 04:42 PM
08/26/17 04:42 PM
Joined: Feb 2006
Posts: 1,562
Farmers Branch/Sulphur Bluff
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bronco71 Online content
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The problem with the 3 batteries in parallel is that they will eventually become uneven and charge at different rates, also if one goes bad it takes out the others. It also takes way longer to bring them all up to full charge.

I have used an automatic charge relay system on my boat for over 12 years; 2 bank charger with 1 12v starting battery and 2 12v deep cycle trolling batteries combined for 24v motor. The 2 charger banks are hooked to the auto relay along with the charging lead from the outboard, the relay has leads to each battery individually. The relay varies the charging from the outboard or the 2 bank charger to each battery as needed. When it senses a 24v load it combines the 2 deep cycle batteries for 24v. It can also be wired to control charging from the tow vehicle. Have had no problems at all and it is nice to have the outboard topping off the batteries as needed when cruising.

Don't remember the name of mine but a quick search shows there are several on the market now.

Re: Charger and batteries in parallel [Re: joho5] #12402472
08/26/17 10:01 PM
08/26/17 10:01 PM
Joined: Feb 2010
Posts: 10,758
Lewisville Tx.
shut-up-and-fish Offline
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Lewisville Tx.

It is recommended to have a independent charge on each battery. Each battery is a bank so if you have four batteries you will need a four bank charger. You are only stressing the charger and batteries doing it the way you are wanting to do it.



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Re: Charger and batteries in parallel [Re: joho5] #12404777
08/28/17 05:39 PM
08/28/17 05:39 PM
Joined: May 2011
Posts: 559
NE Texas/SW Arkansas
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Jones Trolling Motor Offline
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NE Texas/SW Arkansas
If the batteries is in parallel, what you are wanting to do is the best way to charge the batteries. If you try to use a multi bank charger on paralleled batteries, the charger could read itself on the other batteries, "think" it is charged and go into a reduced charging mode or cut off. Just be aware that whatever amp charger you have is going to determine the length of time it takes to charge.
John


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www.jonestrollingmotor.com
texarkana, Ark/Tx
Re: Charger and batteries in parallel [Re: Jones Trolling Motor] #12409857
09/01/17 03:01 PM
09/01/17 03:01 PM
Joined: Jul 2008
Posts: 3,007
Abbott, TX
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joho5 Offline OP
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joho5  Offline OP
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Abbott, TX
Originally Posted By: Jones Trolling Motor
If the batteries is in parallel, what you are wanting to do is the best way to charge the batteries. If you try to use a multi bank charger on paralleled batteries, the charger could read itself on the other batteries, "think" it is charged and go into a reduced charging mode or cut off. Just be aware that whatever amp charger you have is going to determine the length of time it takes to charge.
John


This is what I was thinking.

I didnt know that using separate banks on one 12v big bank would work.

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