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post #1 of 34 Old 04-04-2011, 09:09 AM Thread Starter
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Researching Dual Battery Setups - Do I need it?

Right now I don't have any accessories on the JK except for a Viper alarm.

My Warn M8000 Winch will be there this week. In the near future, I plan to run either Rigid Industry or KC lights.

Will I need dual batteries for the winch?

Also, from my searching it seems like Benchmark is the system to go with.

Does anyone have a wiring schematic of a dual battery system? I want to understand how everything is setup and why.

Thanks!


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post #2 of 34 Old 04-04-2011, 09:31 AM
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No. Just upgrade to a deep cycle battery. The Odyssey batteries are the best IMO. I have alot more accessories, and I still run a single battery.

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post #3 of 34 Old 04-04-2011, 12:50 PM
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I gots the dual battery ...it's cool. Caused me some major issues (my fault). All things considered, for the money, if I did it over again, I'd probably go with one top shelf battery and a sPod.

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post #4 of 34 Old 04-04-2011, 02:15 PM
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The only reason to have a dual battery system is if you want to run power hungry accessories while the vehicle is OFF.

When the vehicle is ON/RUNNING, electrical power is being generated/supplied by the vehicle's alternator. If the battery is being utilized while the vehicle is running then the alternator is TOO weak for your application. If this is the case then an upgraded alternator is required. Generally speaking, the role of the vehicle's battery is to supply power for the starter to crank the engine; that's it. There can be situations where the battery is called upon but by and large, when the vehicle is running, the alternator is the source of power.

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post #5 of 34 Old 04-04-2011, 02:55 PM
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Agreed with all you said but this....

Quote:
Originally Posted by MaloCS View Post
Generally speaking, the role of the vehicle's battery is to supply power for the starter to crank the engine; that's it. There can be situations where the battery is called upon but by and large, when the vehicle is running, the alternator is the source of power.
Don't want to start a big debate but your altenator keeps your battery charged, and your battery is what runs everything electrical on your vehicle. If your altenator craps out while you're driving down the highway, your vehicle will not stop functioning until all of the juice in your battery is used up. Of course, that length of time depends on what accessories you're using and how many amps they are pulling.

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I'm in the same situation. I think I'm just going to upgrade the battery. Probably a Red Top.

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post #6 of 34 Old 04-04-2011, 03:22 PM
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Quote:
Originally Posted by MSUJeep View Post
Agreed with all you said but this....



Don't want to start a big debate but your altenator keeps your battery charged, and your battery is what runs everything electrical on your vehicle. If your altenator craps out while you're driving down the highway, your vehicle will not stop functioning until all of the juice in your battery is used up. Of course, that length of time depends on what accessories you're using and how many amps they are pulling.
Different way of saying the same thing. All he was saying was the total current draw under normal conditions (be that running a ton of lights, big stereos, or long hard winching) shouldn't exceed the amount of current the alternator can put out. One can run over the alternator's capacity for a bit, but eventually you'll drain the battery.

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Thats a special kind of stupid right there.......
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post #7 of 34 Old 04-04-2011, 03:25 PM
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Quote:
Originally Posted by MSUJeep View Post
Agreed with all you said but this....



Don't want to start a big debate but your altenator keeps your battery charged, and your battery is what runs everything electrical on your vehicle. If your altenator craps out while you're driving down the highway, your vehicle will not stop functioning until all of the juice in your battery is used up. Of course, that length of time depends on what accessories you're using and how many amps they are pulling.

..hijack over.

Mike
I'm in the same situation. I think I'm just going to upgrade the battery. Probably a Red Top.
Your statement is true but not 100% correct. The alternator generates ALL of the vehicles power, period. If the alternator is functioning properly and as a result the battery is always fully charged, then the electricity exits the alternator, hits the battery and gets passed on to any device that requires it.

If the alternator cannot keep up with the vehicle's draw, whether it's due to defect or being under powered, then the battery is called upon to meet the vehicle's electrical needs. If the alternator is strong enough to meet the vehicle's electrical needs then the battery is nothing more then a passive conduit for the electricity that is being generated by the alternator.

As far as I know, there is no switch that turns off the alternator when the battery is fully charged and turns on the alternator when the battery needs juice. Due to the nature of electricity there isn't a need for this type of switch as the power will simply flow through a fully charged battery while on it's way to power the vehicles electrical components.

Again, the only time the battery is called upon is when the alternator cannot handle the vehicle's electrical draw. Are there situations where this is common? Sure there are. But if this is the case I would upgrade the alternator before adding a second battery. Why? Because if the alternator is having a hard time supplying the vehicle's electrical needs then how can I expect it to meet the needs of keeping a second battery charged?

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post #8 of 34 Old 04-04-2011, 03:35 PM
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.....As far as I know, there is no switch that turns off the alternator when the battery is fully charged and turns on the alternator when the battery needs juice....
Actually the alternator regulator controls the output in accordance to demand and to maintain battery charge otherwise you'd get an overcharged battery ( not a good thing).
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post #9 of 34 Old 04-04-2011, 03:56 PM
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Quote:
Originally Posted by Panamon Creel View Post
Actually the alternator regulator controls the output in accordance to demand and to maintain battery charge otherwise you'd get an overcharged battery ( not a good thing).
True. My bad on that brain fart. I got wrapped up in on/off. Hate it when that happens.

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post #10 of 34 Old 04-04-2011, 03:59 PM
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True. My bad on that brain fart......
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post #11 of 34 Old 04-04-2011, 04:04 PM
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Along the same lines, I'm looking for a dual battery setup but have heard horror stories about Benchmark and their customer service. Any other options for a good dual battery setup?
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post #12 of 34 Old 04-04-2011, 05:01 PM
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Not to say I am anti dual battery but so far I haven't seen the need.. I run a winch, 4 Hellas, compressor, ARB Fridge, etc... not once have I said.. "Damn, I wish I had done the dual battery mod". <shrug>

I'm not ruling out ever doing it, but it is pretty far down on the wants list.

Right now the single Yellow Top does me fine.

°lllll°


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post #13 of 34 Old 04-04-2011, 05:23 PM
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Quote:
Originally Posted by HITMONEY View Post
Not to say I am anti dual battery but so far I haven't seen the need.. I run a winch, 4 Hellas, compressor, ARB Fridge, etc... not once have I said.. "Damn, I wish I had done the dual battery mod". <shrug>

I'm not ruling out ever doing it, but it is pretty far down on the wants list.

Right now the single Yellow Top does me fine.
This is my dilemma,the return on investment. As it stands now I really only want a dual battery system so I can bump my stereo when camping. I really want it but I just can't pull the trigger for the limited use it will see.

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post #14 of 34 Old 04-04-2011, 05:37 PM
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Quote:
Originally Posted by MaloCS View Post
This is my dilemma,the return on investment. As it stands now I really only want a dual battery system so I can bump my stereo when camping. I really want it but I just can't pull the trigger for the limited use it will see.
That and lugging around a second battery... not exactly prudent in my case since I am trying to shave some pounds.. not add them.

I guess I can see the need for a multiple battery system in a rig that is more set up for Expedition type stuff... it is nice to have a back up if needed if your out in the middle of no where alone. Me, I'll just ask someone in my group for a jump.. they will probably have dual batteries!

°lllll°


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post #15 of 34 Old 04-04-2011, 05:53 PM
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like hit said, its more for a redunancy(sp?) setup where your to far out to have a battery/alt fail and leave you stranded. i run 2 batt in my pontoon boat as im terrified of something happening and the batt going dead, one just for starting and when im floating around i switch it to another for music/lights.
off topic does anyone offer a high output alt for the jk yet?

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post #16 of 34 Old 04-04-2011, 05:58 PM Thread Starter
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Thanks for all of the feedback. I'll probably just upgrade the battery to a Die Hard Platinum (Oddessy rebrand).


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post #17 of 34 Old 04-04-2011, 06:37 PM
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Dual Battery

New member so forgive if I do this wroing. I installed a Benchmark battery set up and two hard plastic lines run to a valve, they are bent the wrong way for a clean install, also this valve is kinda blowing in the wind as mount was removed with the orginal battery box. The way the tubing is bent it wants to hang over where the second battery is suppose to be. Can I heat this tubing up and rebend it or???? Oh yeah, 2009 Sahara model, if it makes any difference. Thanks in advance
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post #18 of 34 Old 04-04-2011, 07:01 PM
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i have read people talking about mean green high output alternators, but know absolutely nothing about them.

http://www.mean-green.com/products/alternator.html

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post #19 of 34 Old 04-04-2011, 07:29 PM
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I run the dual battery for a lot of reasons but the main one being that I use my JK to go camping and tote along a welder that requires 24 Volts.


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post #20 of 34 Old 04-04-2011, 08:02 PM
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Quote:
Originally Posted by bogoble View Post
New member so forgive if I do this wroing. I installed a Benchmark battery set up and two hard plastic lines run to a valve, they are bent the wrong way for a clean install, also this valve is kinda blowing in the wind as mount was removed with the orginal battery box. The way the tubing is bent it wants to hang over where the second battery is suppose to be. Can I heat this tubing up and rebend it or???? Oh yeah, 2009 Sahara model, if it makes any difference. Thanks in advance

Pics, Not understanding ? Do you mean the smart isolater (ie. valve)? Plastic lines: Battery cables? Flapping in the wind ?
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post #21 of 34 Old 04-04-2011, 08:31 PM
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Pics, Not understanding ? Do you mean the smart isolater (ie. valve)? Plastic lines: Battery cables? Flapping in the wind ?
I think he's referring to the EVAP Purge valve and the corresponding hard lines. I'm not sure I would be comfortable applying too much heat to these, as they contain gasoline vapors. As far as "flapping in the wind", Benchmark newest tray has a mount for the valve, and others have made their own.

See what search can find?

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post #22 of 34 Old 04-04-2011, 09:04 PM
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i eventually want to get dual batteries but its just hard to think about dropping 500 for 2new batteries and the tray and wiring.


check out 12 volt guy hes got a dual battery system just need a tray to make it work or something else


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post #23 of 34 Old 04-06-2011, 12:20 PM
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Quote:
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so I can bump my stereo when camping. .
So your that guy.....

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post #24 of 34 Old 04-06-2011, 12:23 PM
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If you are interested in a very clean, easy kit to install go this route.

https://jkowners.com/forum/showthread.php?t=43375


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post #25 of 34 Old 04-06-2011, 12:32 PM
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I use my back up battery to run all the mumbo jumbo acc. The jeeps electrical sytem is far to complex and is very sensitive and unless you understand the BS of Canbus. Its nice isolating all your aftermarket goodies to a sep batt. Mine is set up so the jeep has its own starting batt and also can jump start its self if need be......

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