Deep cycle battery gurus, help needed

[gotmuddy]

As I am working on my 1980 lowe I am to the point of trolling motors. Either a 40lb 12v with one big battery or a 24v model with two small AGM batteries. Obviously the two smaller batteries will have more surface area than the one big battery but will power be lost between them? The 24v trolling motor is free, but needs a speed control(motorguide). It is my brother-in-law's and he says it costs $250 to fix, which I find hard to believe.

Any thoughts or info would be appreciated. The AGM batteries weigh 26lb each and I imagine a decent regular deep cycle battery weighs 60lb+

 

[redbug]

What size agm battery are you talking about? Why are you thinking agm? If it were me I would go with the 24volt motor and 2 size 24 wet cell batteries. you can pick them up for around $60 each versus $120 each for the agm batteries. you will be able to run your motor for hours without any drop in power. The Agm battery will be heavier than a wet cell and cost you twice as much.
The $250for the repair is most likely to have a shop make the repair
You can find the parts on line and do the repair yourself and save money that way.
Wit a 24volt motor you will get a longer run time out of the batteries just be sure to charge them as soon as you get off the water to give them the longest life

Wayne

 

[ben2go]

I agree.Get the model number of the trolling motor and check out this place for parts. https://www.trollingmotorparts.com

 

[gotmuddy]

here are the batteries I am thinking about using:

https://cgi.ebay.com/Trolling-Motor-Sealed-Battery-Sevylor-Minn-Kota_W0QQitemZ200279714850QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item200279714850&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A3%7C65%3A12%7C39%3A2%7C240%3A1318

should be a pretty decent battery. The question is though, would it be best to run them parallel(12v) and use a 12v motor or in series(24v) and use the 24v motor.

 

[redbug]

to be honest I think that battery would not hold up in a trolling motor application.
If you go to the guber web site they don't list any batteries for a trolling motor application
I did a quick search on Trojan batteries and found their 12v deep cycle with run for 225 Min's under a 20amp load
they are one of the top batteries on the market but well worth the money
it is more the size of a tractor battery and doesn't give you any reserve capacity.
unless you are going to be using it on a small farm pond you will not be happy with it.
when buying a battery size does matter the bigger the better 100%of the time
but when weight is a factor you can go a little smaller and not suffer to much.

The advantage of using a 24volt motor is your amp draw will be lower for the same power level thus giving you more time on the water.

 

[gotmuddy]

thanks for the reply redbug. I guess I will just go with one of the wally world ones. I was trying to keep the weight down up front as much as possible.

 

[ben2go]

When it comes to multi voltage trolling motors,in your case a 12/24,the more volts you have the less amperage will be required to drive the motor.This in turn gives you a longer run time before recharging.It's easier on the batteries and motor to run maximum rated voltage.However,TM's are stout devices and last a long time when operated correctly.