harshman Posted March 20, 2008 Posted March 20, 2008 I'm getting ready to replace my TM batteries in my boat and would like some input please. The original set up had 2 batteries for one 12 volt TM. Is there any advantage to having 2 batteries for this sort of setup? or should I just by 1? I would think that the 2 batteries would give me more time on the water, but my dealer is telling me otherwise. Please any advice would be helpful. I guess my main hang up is to buy 2 - $60 batteries or get the biggest and best single batteries I can find for $100. Harshman Quote
skillet Posted March 21, 2008 Posted March 21, 2008 X2! Hope you get a good answer, I've wondered about this myself :-/... As Ever, skillet Quote
crazy larry Posted March 21, 2008 Posted March 21, 2008 two batteries increases your run time, either ran one at a time, or hooked up in parallel..... WOuldn't matter what type of battery, agm, flooded, or otherwise.... I'm curious why your marine dealer would tell you that.?. :-? although, it is my understanding that an agm battery will hold a charge longer than a flooded cell, maybe that is what the dealer is referring to.... I've not broken down and used anything better than an old flooded cell myself. Either way, I'd run two if I could. Quote
surfer Posted March 21, 2008 Posted March 21, 2008 It's all about the Amp Hours (Ah). It is possible to get one huge battery that has more amp hours than two combined, but probably more expensive and heavy as all hell. You can simply add the amp hours of the two batteries together to get their combined amp hours. More amp hours (Ah) = more run time. If the dealer says something different then he is misinformed. Quote
harshman Posted March 21, 2008 Author Posted March 21, 2008 Larry My dealer was trying to tell me that the amount of run time I would get out of the second battery would not be woth the extra weight and cost in the boat...... Logicly I would think it would be but I am not very knowledgable when it comes to batteries. Harshman Quote
Garnet Posted March 22, 2008 Posted March 22, 2008 If you hook your batterys in parrallel you will get about 1/3 more running time. If you hook 1 up and run it down and hook the next one and run it down you will get max running time but it's very very hard on batterys. Another thing if your batterys are hooked together and 1 goes bad they are both dead quickly. Garnet Quote
harshman Posted March 22, 2008 Author Posted March 22, 2008 Thank You guys for your opinions. My boat is a 19' Charger with a 12 volt tm 42 lbs thrust. It seems that there are as many pros and cons to having two batteries Harshman Quote
Super User Tin Posted March 22, 2008 Super User Posted March 22, 2008 Thank You guys for your opinions.My boat is a 19' Charger with a 12 volt tm 42 lbs thrust. It seems that there are as many pros and cons to having two batteries Harshman Wow a 42 pound thurst TM on a 19' Charger? :-/ Quote
Hot Rod Posted March 22, 2008 Posted March 22, 2008 IMO I'd go with 2 for that size rig rated for as many amp hours as you can afford. I'm guessing with that size TM if you get in wind/current you are going to be in HIGH and on the motor alot. I have a 65lbs 24V on my 18.5' Strat and I wish I had more for wind/current but with the two batteries pulling 24V I've never ran out of juice on a single day fishing from dark to dark. Quote
Garnet Posted March 22, 2008 Posted March 22, 2008 Thats another, it takes half the draw to make the same pull with 24v. So if you put the 12v on half and was turning 20 times a second you would but 24v on 1/4 to turn 20/sec. I'm just guessing at the turns/sec and 36v that mush less. Garnet Quote
The Rooster Posted March 22, 2008 Posted March 22, 2008 What one person here said about two batteries hooked together and one running down killing them both in a short time is totally true. My brother in law has a truck that has two starting batteries in it wired in parallel. Whenever one battery goes bad, or dead for some reason, the other one won't even crank the truck over. So we started trying to find out why and was told that two batteries wired in parallel must be totally equal or one will end up drawing down the other one with them trying to equal themselves out in terms of charge. So if you do this then I'd get two brand new ones exactly the same and at the same time. My brother in law has had nothing but trouble replacing only one battery at a time in that truck. Putting a new and an old together just doesn't work at all cause one is no longer equal to what the other one is. I would think that this would carry over to deep cycle batteries as well. Quote
Hot Rod Posted March 23, 2008 Posted March 23, 2008 Thats another, it takes half the draw to make the same pull with 24v. Sorry for the confusion. I didn't make my point very clear. I just meant that I have a similar size boat with a 24V TM and sometimes I wish it were more power wise in strong current/wind especially. Therefore with a 12V system I would want as much battery life as I could get. I did not mean it to sound like I was equating the power and amperage of a 24V system to a 12V with two batteries system. Quote
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