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Max Online: 36273 @ 01/23/13 02:34 PM
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#12401981 - 08/26/17 08:35 AM Charger and batteries in parallel
joho5 Online   content
Extreme Angler

Registered: 07/03/08
Posts: 2703
Loc: 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?

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#12402065 - 08/26/17 09:50 AM Re: Charger and batteries in parallel [Re: joho5]
Capt Craig Offline
Extreme Angler

Registered: 08/25/09
Posts: 1401
Loc: Richland-Chambers
No. Each battery has to be connected to its own charging bank.
_________________________
Capt. Craig Copeland
Licensed by the US Coast Guard

2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)

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#12402078 - 08/26/17 09:58 AM Re: Charger and batteries in parallel [Re: joho5]
Bob Landry Online   content
Extreme Angler

Registered: 08/10/11
Posts: 2569
Loc: 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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#12402085 - 08/26/17 10:02 AM Re: Charger and batteries in parallel [Re: joho5]
shut-up-and-fish Online   content
TFF Celebrity

Registered: 02/08/10
Posts: 9700
Loc: 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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#12402141 - 08/26/17 10:36 AM Re: Charger and batteries in parallel [Re: joho5]
joho5 Online   content
Extreme Angler

Registered: 07/03/08
Posts: 2703
Loc: 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?

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#12402209 - 08/26/17 11:42 AM Re: Charger and batteries in parallel [Re: joho5]
bronco71 Online   content
Extreme Angler

Registered: 02/05/06
Posts: 1318
Loc: Farmers Branch/Sulphur Bluff
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.

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#12402472 - 08/26/17 05:01 PM Re: Charger and batteries in parallel [Re: joho5]
shut-up-and-fish Online   content
TFF Celebrity

Registered: 02/08/10
Posts: 9700
Loc: 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.
_________________________

www.shut-up-and-fish.com
It's all coming together and we have you covered @ Shut-Up-And-Fish LLC
From *Sales *Installation Services *On the Water Education & Instructional Trips
we are your One-Stop-Shop for all Humminbird MinnKota & Motorguide needs & more
972 822 9285

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#12404777 - 08/28/17 12:39 PM Re: Charger and batteries in parallel [Re: joho5]
Jones Trolling Motor Offline
Angler

Registered: 05/01/11
Posts: 484
Loc: 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
_________________________

www.jonestrollingmotor.com
texarkana, Ark/Tx

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#12409857 - 09/01/17 10:01 AM Re: Charger and batteries in parallel [Re: Jones Trolling Motor]
joho5 Online   content
Extreme Angler

Registered: 07/03/08
Posts: 2703
Loc: 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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