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Old 06-28-2013, 08:28 PM   #1 (permalink)
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Default 2 batteries are better than 1

Can anyone tell me what i need and how to set up a dual 12 volt batery system in my 88 suzuki samurai ?
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Old 06-28-2013, 08:51 PM   #2 (permalink)
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First question is WHY?

How you connect dual batteries depends on why you're fitting them.
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Old 06-28-2013, 10:18 PM   #3 (permalink)
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just to run more auxillary lights, winch etc etc, i still want to keep it as a 12 volt system.
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Old 06-29-2013, 02:26 AM   #4 (permalink)
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There's a few ways to do it but this comes to mind first:

Install a "Marine Battery Selector Switch"

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If you plan to charge both at the same time while running then both batteries have to be equally in good shape otherwise one will draw the better one down.
If i had that switch and two different condition batteries i would charge each separately then always have the spare new one if needed or just run your extras off say battery 2 and switch to that mode when out in the wilderness.
Your post has me kicking around doing the same mod now.
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Last edited by Joe Z; 06-29-2013 at 02:44 AM.
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Old 06-29-2013, 08:35 AM   #5 (permalink)
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For winching purposes, hard wire both batteries together and upgrade your alternator - for auxiliary lights upgrade your alternator. The marine selector switch is nice, but 350A is a little underrated for a hard winch pull.

Oh - I forgot - you'll need both batteries to be the same type, capacity & approximate age. Paralleling batteries with different chemistries will result in charge problems, paralleling batteries with different capacities will result in the larger battery ending up with the same capacity as the smaller one, paralleling batteries of different ages will result in premature failure of the newer battery (yes - it will fail at the same time as the older one).
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Last edited by fordem; 06-29-2013 at 11:12 AM. Reason: Add. info
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Old 06-29-2013, 12:26 PM   #6 (permalink)
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i have the alternator from the sidekick right now, what kind of alternator would you suggest, and would i need some kind of isolator or just run the two batteries in a parallel, so i ground one and the power to the other one no isolator? or the marine switch would also run both batteries in a parallel? or both on a seperate line with two whole different +,-?
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Old 06-29-2013, 05:13 PM   #7 (permalink)
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Use google, find some offroad forums (try ZukiWorld), do some research and find out what you're getting yourself into, and what your options are.

The purpose of an isolator is to allow both batteries to be charged from the same charge source (alternator) whilst keeping them separate (or isolated) so the load on one does not affect the other - this is how you would set your batteries up if you wanted to use one as a "camp site" power source, for lighting, maybe run a 12v fridge, without draining the starting battery.

The marine switch will connect between the vehicle's electrical system and the two batteries - it will allow you to select #1, #2, both or none - select either battery by itself and the battery that's not in use will sit there, self discharge & eventually sulphate (unless you remember to periodically switch from one to the other - lead acid batteries do not do well when left idle, they must be charged at intervals) - the people I know who use that style of switch end up leaving it in the 1+2 position - which is the same as hardwiring the batteries together.

Both battery negatives are going to be wired to the frame/chassis - what you do with the positives will depend on how you choose to wire it - if you use an isolator, wire as per the isolator manufacturers instructions - there are different types of isolator, so pay close attention to those instructions - if you use the marine switch, wire as per the marine switch manufacturers instructions, and NEVER turn the switch to OFF with the engine running.
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Old 07-02-2013, 10:23 AM   #8 (permalink)
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Default 1 big battery better than 2

I just use a single big Costco deep cycle Marine/Starting battery.
Had to remove the steel battery "compartment Flap thingy" to fit it in.
I go 6 hours running a bluetooth deck, amp and wakeboard speakers, bazooka sub, and a 7 amp waterpump (for the hot tub). and she'll turn over and start with no problems. go driving for half an hour and repeat...all day long!!
See below

https://www.youtube.com/watch?v=PUChKgZikAc[/url]
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Old 07-02-2013, 07:03 PM   #9 (permalink)
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ya i got the optima blue top deep cycle, but i need to run an warn winch,5 sets of off road lights, belly camera, plus the stereo and head lights, so i am looking for an easy dual battery setup.
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Old 07-02-2013, 07:49 PM   #10 (permalink)
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A dual battery system is not the solution to your needs - batteries are storage devices - they have a finite capacity, if you want to run large loads you need a high output alternator to supply them.

If you must run five sets of offroad lights, consider switching to HID or LED to reduce the amp draw.
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Last edited by fordem; 07-02-2013 at 08:00 PM.
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