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Thread: Trolling Motor Battery Question

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    Default Trolling Motor Battery Question


    Not sure if this is the right place to ask, but i have a new to me 2008 triton with 2 battery 24v ultrex. this will be fine for spider rigging but i know for cranking i will need to either change to 36v or add 2 more batteries.
    my thoughts are to add 2 more group 31 for cranking for the short term. The 2 batteries in the boat now have been relocated to the front of the boat along with the battery charger. It rides great and seems to help weight distribution. The charger power cords have been extended to run to the back where the boat power plug is. If i were to add 2 x group 31 batteries in the back with a separate charger would i be able to use an a/b toggle switch to connect to the same wires going to the trolling motor or would i need to run them separate?

    thanks

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    Quote Originally Posted by crappiejim View Post
    Not sure if this is the right place to ask, but i have a new to me 2008 triton with 2 battery 24v ultrex. this will be fine for spider rigging but i know for cranking i will need to either change to 36v or add 2 more batteries.
    my thoughts are to add 2 more group 31 for cranking for the short term. The 2 batteries in the boat now have been relocated to the front of the boat along with the battery charger. It rides great and seems to help weight distribution. The charger power cords have been extended to run to the back where the boat power plug is. If i were to add 2 x group 31 batteries in the back with a separate charger would i be able to use an a/b toggle switch to connect to the same wires going to the trolling motor or would i need to run them separate?

    thanks
    why would you have to change to a 36volt system or add 2 more batteries ??? how many hours do you plan on pulling crankbaits ??? what I would do is try the setup you have now and see if it will do the job !!! if not then look into getting you a better battery setup ; like 2 golf cart batteries instead of 4 group 31 batteries !!!

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    those are ideas that i will consider...the batteries i have will do about 4 hours at around 2mph or so with the wind.. i have not heard of the golf cart batteries doubling this time.. i will pull 8 hours or more since i am driving a fairly long distance to fish..

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    I have 2 group 31 deep cycle batterys....I can pull cranks at 1.8 mph for 8 hours and still have some left. First set of batterys lasted 7 years....I keep a check on the water and top off when needed....when I am not fishing my MK 330D digital charger is plugged in 24/7
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    Quote Originally Posted by crappiejim View Post
    those are ideas that i will consider...the batteries i have will do about 4 hours at around 2mph or so with the wind.. i have not heard of the golf cart batteries doubling this time.. i will pull 8 hours or more since i am driving a fairly long distance to fish..
    the guys in Mississippi use the golf cart batteries and they pull some crankbaits for sure !!!
    I am sure they are getting way better then 4 hours out their setup for sure !!! maybe one those guys will see this post and chime in !!! and you could post on the Mississippi board and ask them about the golf cart batteries and the time they are getting on them !!!

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    I have 24 volt ulterra. With three people and windy conditions I would get 5 hours trolling. I added 2 more group 27's and solved my problem. price of 2 batteries was a lot cheaper than going to a 36 volt trolling motor. I was lucky to have enough space to have 4 batteries as my fuel tanks are under my bench seat in the middle of the boat.
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    It seems that most bass boats my size and up have 36v systems. i have plenty of space and weight allowance for the extra batteries and the cost is considerably cheaper... hopefully someone knows about the switch.. i can always run separate..just trying to see if it is feasible

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    Quote Originally Posted by crappiejim View Post
    It seems that most bass boats my size and up have 36v systems. i have plenty of space and weight allowance for the extra batteries and the cost is considerably cheaper... hopefully someone knows about the switch.. i can always run separate..just trying to see if it is feasible
    dang I just realized you are from Mississippi !!! if moneys is no issue and you have the space for the extra batteries a 36 volt system would be way better then what you have and you would get the run time you are looking for !!!!

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    Jim, I’m going to try to explain this best I can. If it doesn’t make sense you can call me. First is the factory trolling motor wiring still in back of boat? If it wasn’t cut off and tied onto new batteries your hard part is done. If it was pulled out or cut off enough where you cat use it then you will have to run new wiring.
    New batteries in back of boat, jumper across the 2 to make 24. Now your going to run ground from rear set to ground post on front battery that trolling motor ground is hooked to. Then your going to install a breaker at positive of rear battery set, from that a positive wire to front of boat. Then your going to need a A/B switch that will handle at least 60 amps. On one leg in your going to hook positive wire from rear set then on other leg your going to hook positive lead from front batteries. Then you will hook positive wire from trolling motor to center post of A/B switch. That should let you shift back and forth between two sets. Grounds being hooked together have no affect on either set running or charging. I don’t have a diagram of a A/B switch so I’m making an assumption on how they hook up but in most cases they would be set up to have A on then shift B on and a off position to shut both off. In this particular set up do not by a cheap switch off eBay or some of these other places. Get a good heavy duty one from someplace like west marine.
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    My suggestion would be 1st is to see how the current batteries perform pulling cranks. It's all about the quality of batteries and reserve capacity. I have an 18' glass and when I bought the boat it had two group 29 interstates designated for the 24v system. I installed my Ultrex and could pull cranks for 8 hours and still have juice left. I had to buy new batteries last year and got in a hurry. Got two group 31 fish hunters (deka) made for Ellis battery specs. My pulling time went to 6 or 7 hours depending on water conditions. I don't buy into the hype of cart batteries unless your maxed out on pounds of thrust already. I think you may be jumping the gun, unless the previous owner has made you aware of run time already. The US Batteries in group 31's boast the best reserve capacity I've seen and that will be my next set. Sounds to me like you may be over complicating matters before you know how the boat will perform. Just my opinion and hope this gives you a little food for thought anyway.

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