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Old 10-29-08, 12:47 PM   #1
jcw1503
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Default Deep Cycle vs. Dual

I recently purchased a boat and i looking to buy some batteries, i nedd help with what i need...i have one battery which is used to run the engine....i have room for two more batteries....should i go with deep cycles or dual purpose or one of each...any help....
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Old 10-29-08, 01:29 PM   #2
Bender
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If they are just for the trolling motor then they should be deep cycle. If you are using them for both purposes, then dual purpose.
From my understanding deep cycles are not designed for the fast, high current drains such as starting an outboard. They specialize in draining slower therefore lasting longer with lower, more consistent loads such as a trolling motor.
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Old 10-29-08, 01:50 PM   #3
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which would be best for say livewell and bilgepump
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Old 10-29-08, 02:31 PM   #4
MississippiBoy
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Deep cycle. They would be running for a long time at a fairly low draw, so getting deep cycle batteries would help them last longer.
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Old 10-29-08, 02:34 PM   #5
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thanks!!!!
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Old 10-29-08, 02:35 PM   #6
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can i use a regular marine battery charger for the deep cycle or do i have to buy a different charger...i have heard that you have to buy a special charger.
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Old 10-29-08, 03:12 PM   #7
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and also, typically how long will the battery last if i use it for the engine and thats it. should i have to worry about it getting used up in one day....i know it might be a stupid qustion but i would like to know
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Old 10-29-08, 03:13 PM   #8
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the reason i ask is because i have room for three batteries and i was thinking getting two deep cycles...what is yalls advice
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Old 10-29-08, 03:26 PM   #9
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typically you should run all accessories (bilge, livewell, etc) from ypurcranking battery and for that use a dual purpose. Itshould last many days and if you are running the gas motor a lot you may not need to charge it much at all.
The trolling motor should be the only thing on it's batteries. You will get the maximum out of those batteries and at the end of the day if they are dead you can still start the gas motor because you didn't run that one down.
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Old 10-29-08, 03:37 PM   #10
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so one dual purpose for everything but trolly motor and one deep cycle for the trolly motor and thats all i need i should not need another battery?
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Old 10-29-08, 03:37 PM   #11
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and do i need a special charger for the deep cycle
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Old 10-29-08, 03:54 PM   #12
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should i use the running lights on the dual purpose battery two, or on a seperat battery.
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Old 10-29-08, 08:19 PM   #13
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Is your trolling motor 12, 24, or 36V? Even if it is 12V you might want 2 batteries just for it depending on how much you use it. You can wire two batteries up in a circuit to achieve either 12 or 24v if done in series or in parallel. For 36V you need three batteries.
I would put the lights on the dual purpose cranking battery.
As for the charger I'm not 100% sure, but I don't think that you would want more than 10A per bank, but a 2A will take a very long time. Other than that I don't know of a special one for deep cycle batteries but I could be wrong. I have an on board Minn Kota one.
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Old 10-30-08, 09:09 AM   #14
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Ok, so i have room for three batteries, i have a 12 volt trolly motor, livewell, and bilge pump, and a 82 150hp evinrude.....should i get one starter, one dual, and one deepcycle...i say one of each is because maybe the dual could be used as a backup for both of them..or should i go with a different setup...i know i am asking alot of questions but i want to know as much as i can before i go spend more money....thanks you guys...and i especiall don't want to end up stuck on the water..
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Old 10-30-08, 09:18 AM   #15
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That sounds like a good setup.

I also have a set of jumper cables onboard just in case.
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Old 10-30-08, 09:50 AM   #16
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If you buy a new boat today and it comes with 3 batteries it will have one cranking/dual for the starter and everything else, then 2 batteries that are 100% dedicated to the TM.
If the cranking/dual battery dies you can always use one of the TM batteries for a while. They will crank the motor fine, they are just not designed to do it all day.

IF YOU ARE WIRING IN THE BOAT MAKE SURE TO USE FUSES/CIRCUIT BREAKERS AS CLOSE TO THE BATTERY CONNECTION AS POSSIBLE. Yes, I was yelling, you do not want a boat fire.
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Old 10-30-08, 10:32 AM   #17
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Thanks woody and Bender!!!
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