Wiring 2 deep cycle to to charger and trolling motor

[hubes58]

I just join this.... could anyone help and let me know if this is correct?
I have a lund fisherman and bought a 2 bank charger last year, and just added to new deep cell batteries for my minnkota trolling motor. does this look right? ( before I had the one deep cell and it would not last the day)

 

[rndn]

Re: Wiring 2 deep cycle to to charger and trolling motor

Welcome to the forum!!
It looks fine.

 

[flargin]

Re: Wiring 2 deep cycle to to charger and trolling motor

is it a 12V or 24V trolling motor. That looks fine for a 12V motor, but not a 24V motor.

 

[hubes58]

Re: Wiring 2 deep cycle to to charger and trolling motor

It was formerly hooked up to a singles battery Interstate SMR 27.... I replaced it with 2 of the same batteries, If there was only one battery, wouldndt that make it a 12v?

 

[hubes58]

Re: Wiring 2 deep cycle to to charger and trolling motor

I just looked at the trolling motor model #. It is 55lbs thrust , everything 55 and lower is 12 V. So I should be good to go....

 

[Ridemywideglide]

Re: Wiring 2 deep cycle to to charger and trolling motor

It was formerly hooked up to a singles battery Interstate SMR 27.... I replaced it with 2 of the same batteries, If there was only one battery, wouldndt that make it a 12v?

2 batteries = 12v in parallel (as you have yours) or the = 24v wired in series.

I'm curious why your using a 2 bank charger when the batteries in your diagram are wired parallel??? Essentially, your hooking 2 chargers to 1 battery.

 

[hubes58]

Re: Wiring 2 deep cycle to to charger and trolling motor

When i bought it, it had 1 battery and one bank charger. the went out last year, I bought a 2 bank with the idea of replacing one and adding a second.... wont it charge faster, or more efficently?? I know the instructions for the 2 bank were to hook both leads up to 1 battery when I have the one battery system.....

 

[Ridemywideglide]

Re: Wiring 2 deep cycle to to charger and trolling motor

I don't know anything about your setup, but I know that 2 banks means (at least) 2 SEPERATE batteries..

You are hooking 2 batteries together in parallel, effectively making 1 larger battery. There is no need to hook up both charger outputs as both batteries charge as 1 off the first output.

If you now have 2 12v 1000amp batteries, you in effect are charging 1 12v 2000amp battery the way you have them wired. Unhook the 2nd charge output and use it elsewhere. It may charge faster, but would you hook 2 chargers to 1 battery to make it charge faster? I wouldn't..

I guess if your instructions say to hook up both sets to 1 battery if that's all you have, then you have it wired as directed.....

 

[cappinbob]

Re: Wiring 2 deep cycle to to charger and trolling motor

i'm running the same setup,
is a 10amp charger strong enough to handle the required charge, or do i need a bigger charger?
it does take quite abit of time to get the batteries charged, actually i haven't got a complete charge to the system.it's a ship /shore 10 amp charger.
thanks for any suggestions

 

[flargin]

Re: Wiring 2 deep cycle to to charger and trolling motor

Welcome bob.

It all depends on the way you use your boat. if you have 2 100 AH batteries, you have 200 AH capaciy.

your 10A battery charger will effectively re-apply 8 amps per hour (20% lost to heat) thus it will take approximately 12 hours to charge your batteries if you removed say 1/2 of the power in the battery.

If you use yours for a day, and don't go out until next weekend, it is plenty. If you want to come home and go out the next day... get a bigger one. If you want to go out later in the day... Get a much larger one

 

[Silvertip]

Re: Wiring 2 deep cycle to to charger and trolling motor

There is nothing wrong with this setup. The dual outputs can be connected like they are or they could be bridged (paired and connected to just one of the batteries). the net result is exactly the same. Disconnecting one output would be a mistake since you remove 1/2 of the total output of the charger. Whether the charger is big enough depends on the output of each pair. A 10A dual bank charger is typically rated as a total of the pair so each pair is delivering 5A. If each output is providing 10A (making the charger a 20A unit), then that is very adequate for overnight charging. A 5A output would not make the grade on deeply discharged batteries.

 

[Ridemywideglide]

Re: Wiring 2 deep cycle to to charger and trolling motor

They are bridged already, thus the reason I posted... I'm not familiar with a 2 bank setup tho. I take that it's not going to hurt the 2 bank charger bridging both outputs from what everyone is saying. I'd just not expect it to be the correct way, from my lack of experience...

 

[flargin]

Re: Wiring 2 deep cycle to to charger and trolling motor

They are bridged already, thus the reason I posted... I'm not familiar with a 2 bank setup tho. I take that it's not going to hurt the 2 bank charger bridging both outputs from what everyone is saying. I'd just not expect it to be the correct way, from my lack of experience...

Silvertip is right, this is a fine solution, and happens all the time. two independent sources of charging current for a single battery...

Have you ever had the boat running with a charger on it... same thing.
how about a car running with jumper cables from another car running...
if you have ever had a dual bank charging system on 2 separate batteries, with the Master switch on both....
​

By design, it will not harm anything. The chargers have to be able to handle it, if your chargers would stop working because you started your motor with them attached, you would be returning them pretty fast.... and not very happy...

 

[Silvertip]

Re: Wiring 2 deep cycle to to charger and trolling motor

They are bridged only because the two batteries are wired in parallel. If either the negative or positive jumper between the two batteries are disconnected they would no longer be bridged. My point here is that there is nothing wrong with the existing setup. Electrically the charger outputs can be paired and connected to only one of the batteries and you have the same charging condition. As for disconnecting one output -- that makes no sense as you lose half the charger output which needs to be dedicated to these batteries.

 

[Ridemywideglide]

Re: Wiring 2 deep cycle to to charger and trolling motor

I understand, and I see how it is a workable solution..
It's all semantics to most people about being bridged already. Unfortunately, there are those who don't understand. You saying that hooking them to the same terminal is bridging them, while accurate, leads some to believe that's the only way for it to be bridged.
I was simply pointing out, that as the batteries are tied together, no matter where you hook the 2 outputs, they are "bridged".

Otherwise you'll have some guy stumble along in a month and cry about blowing something up because you said it only bridged if both charger outputs were connected to the same battery, regardless of his physical arrangement.


And while I know that starting your car doesn't blow up the charger that's helping start it, or the other battery with cables, you don't leave them in this condition for hours at a time. When the car starts, you unhook the charger or cables and proceed on your way. I've never heard of anyone leaving their car idling for 8 hours with the charger on it, tho I positive someone out there has probably done it.

I do know from R/C batteries, running to chargers to the same pack is a horrible idea as the output is never equal. The theory is 1 will "overpower"(for lack of a better term) the other and shorten the life of the weaker one, if not killing it.
Now I've never seen this either, but I was also never too interested in potentially wasting a $100 battery, and a $75 charger to test it out.

 

[flargin]

Re: Wiring 2 deep cycle to to charger and trolling motor

I've never heard of anyone leaving their car idling for 8 hours with the charger on it, tho I positive someone out there has probably done it.

I am sure someone has...

But to be serious, I have an RV and will do it for hours. When I am cruizing down the road, we will run the Generator to watch a movie etc... and at that time I have both my auto and my generator charging my systems.

I do know from R/C batteries, running to chargers to the same pack is a horrible idea as the output is never equal. The theory is 1 will "overpower"(for lack of a better term) the other and shorten the life of the weaker one, if not killing it.
Now I've never seen this either, but I was also never too interested in potentially wasting a $100 battery, and a $75 charger to test it out.

RC use different batteries. It is the heat that will kill the RC batteries... especially if you get into the new LIPO batteries.

 

[Silvertip]

Re: Wiring 2 deep cycle to to charger and trolling motor

Diesel powered vehicles have had parallel battery systems for decades with no ill effects. Yes -- if one goes bad it will draw down the better of the two but the charging system is not to blame for that. Batteries die. As for R/C batteries I also use them in my airplanes (nitro and electric) including LIPOs that require a very special charger and cell balancer for optimum performance and longevity. Short one of those puppies and you will never again fail to observe proper polarity.

 

[Ridemywideglide]

Re: Wiring 2 deep cycle to to charger and trolling motor

Diesel powered vehicles have had parallel battery systems for decades with no ill effects. Yes -- if one goes bad it will draw down the better of the two but the charging system is not to blame for that. Batteries die. As for R/C batteries I also use them in my airplanes (nitro and electric) including LIPOs that require a very special charger and cell balancer for optimum performance and longevity. Short one of those puppies and you will never again fail to observe proper polarity.

Agreed.. I fly as well.. Seems the principles are more lax with automotive batteries.

 

[Splat]

Re: Wiring 2 deep cycle to to charger and trolling motor

As for R/C batteries I also use them in my airplanes (nitro and electric) including LIPOs that require a very special charger and cell balancer for optimum performance and longevity. Short one of those puppies and you will never again fail to observe proper polarity.

(as the plank lays there in a few pieces with smoke coming out of the LiPO)
Dude!!!!! forget the wing, I can glue that back..... But you taco'd my new pack!

Bill

 

[F1shermun]

Re: Wiring 2 deep cycle to to charger and trolling motor

how would you wire the same two bank charger to a 24 volt system. Two batts in series?