Dual Batteries
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=52105
Printed Date: May 16, 2024 at 9:07 AM
Topic: Dual Batteries
Posted By: Walkercustoms
Subject: Dual Batteries
Date Posted: March 18, 2005 at 10:47 AM
I want to hook up my dry cell in the front my my car to the one in the rear. What do I need to accomlish this? Do I just run the power cable from power to power and ground the batteries or do I need some thing in the middle of both batteries. The back battery is going to a 5fard cap and then I am going to take 0ga to the distro and out to the two amps. Please let me know what I should do. Thanks
Replies:
Posted By: KarTuneMan
Date Posted: March 18, 2005 at 10:58 AM
Running your battery to the rear is fairly simple. First thing......a BIG ASSED fused for under the hood, on the wire going to the second battery. If you are planning on running the stereo LOUD, for long periods of time, you might want an isolator instead of the fuse. That way you can still crank over the beast when your done jamming. You dont need to run ground. Mount the rear battery securly, and get the ground from a clean SOLID piece of metal. If you use the rite kind of power cell in the trunk area, you won't need a cap. ( www.kinetikaudio.com ) made for car stereo. As far as the 0ga. overkill......looks good, but its really too much. The distances your current has to travel don't justify the cost of the cable..........remeber....just a suggestion -------------
Posted By: Walkercustoms
Date Posted: March 18, 2005 at 11:07 AM
Cool man thanks. I am running two Optima dry cells I am going to run a 300Amp Wafer fuse to the back battery. I found this h-0 something site on here that somebody told me to go to and when I put in my distance and rms settings and 0 is what it told me to run for the distance. Like I said man small systms I never had a problems with but, since we have started are shop and I have upgraded my system I never had to run all this crazy stuff. So, should I keep the 0 running since I have it. Let me know thanks
Posted By: jstruckman
Date Posted: March 18, 2005 at 12:20 PM
If 0 gauge is all you have then go ahead and use it, why waste mony on more wire. I am only running one 10 inch sub on a 600 watt amp and have 0 gauge ran to the back, because that is all i had, plus when people see it they are like "whoa" that is some big ass wire. Plus i have plenty of room for expansion if i want to get crazy.
Jazzy
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Posted By: KarTuneMan
Date Posted: March 18, 2005 at 8:08 PM
Optima red tops.....for starting the car ONLY Yellow top......2nd battery "isolated" Blue top......same as yellow top! Optima makes a GREAT product, if you use it in the rite place.....  if not, you will be very dissapointed  .good luck! -------------
Posted By: Poormanq45
Date Posted: March 18, 2005 at 8:41 PM
Optima = same as everyone else 
Just go buy a deep cycle battery for a second battery.
People think that optima batteries are something special, but they really arn't. The "dry" cell battery, also known as the gell cell battery, has been around for years. It's just now being brought into the light for these "kids" that have to have the brand name to be cool. -------------
Posted By: forbidden
Date Posted: March 18, 2005 at 8:50 PM
Fuse the second battery at the back, this is a must.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: Poormanq45
Date Posted: March 18, 2005 at 8:55 PM
why at the back? SHouldn't it be fused as close to the pole on the front battery as possible? Kind of like when wiring an amp?
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Posted By: forbidden
Date Posted: March 18, 2005 at 8:58 PM
Think about it, why would one normally fuse up front, to keep the vehicle from catching fire in the event of a short circuit, correct? So now he has a battery in the back, what keeps it from starting a fire in the same fashion if it too is not fused within 18" on the run to the front of the vehicle, thus two fuses, one at the front and one at the back. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: KarTuneMan
Date Posted: March 19, 2005 at 1:11 AM
I would say the fuse at the back would be the fuse headed toward the dist. block or the amp or whatever your powering.
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Posted By: MrSector9
Date Posted: March 19, 2005 at 1:31 AM
You could Fuse the front battery close the the front and run that wire to a distribution block.Fuse the rear battery as close as possible and also run that to the distribution block.Then run all the wires to the amps from the distribution block with the appropiate fuses for that piece of electrical equipment.
better to be safe then sorry :)
BJ White
Posted By: forbidden
Date Posted: March 19, 2005 at 1:12 PM
No, the fuse at the back must be between the back battery and the front battery or isolator as close as possible to the battery. It needs to blow if for any reason the wire is grounding out. Sure if it has a fuse up front it may blow the front fuse, but what keeps the rear battery to continue to throw current into a dead short that may be under the drivers seat?
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Top Secret, I can tell you but then my wife will kill me.
Posted By: Mad Scientists
Date Posted: March 19, 2005 at 2:30 PM
Poormanq45 wrote:
Optima = same as everyone else
Just go buy a deep cycle battery for a second battery.
People think that optima batteries are something special, but they really arn't. The "dry" cell battery, also known as the gell cell battery, has been around for years. It's just now being brought into the light for these "kids" that have to have the brand name to be cool.
Gel cell and AGM (Optima) are two different animals.. both lead acid batteries, but different construction. AGM are nice because of no venting requirements, and they don't leak acid. Gel cell in automotive application sizes aren't easily available. Jim
Posted By: stumbler69
Date Posted: March 20, 2005 at 1:28 AM
just wanted to ask what are really good batteries, i was looking at an optima yellow top they i saw the blue top, whats a awsome battery to get?
sorry if this doesnt really go with this thread.
Posted By: Drewt
Date Posted: March 20, 2005 at 6:43 PM
AGM batteries have been around for a while too. Look into your power distrbution subsystem. They use 24volt AGM batteries for their UPS system for the controls...
-Drew
Posted By: Walkercustoms
Date Posted: March 21, 2005 at 10:43 AM
Well the Optima batteries are what my distrubitor carries so, I went with them. The one for the front is an inch longer and the one in the back is a deep cycle.
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