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Thread: Dual Battery Setup?? Help!

  1. #1
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    Dual Battery Setup?? Help!

    Ok, So I'm new, forgive me if this is the wrong catagory.

    Does anyone have a step by step tutorial or would anyone be able to make on for me? Its going to be done to a Toyota Tercel, an 85. I know I need a battery isolator, and a second battery and cable, but thats about it.

    The car is going to be used as a stormchase vehicle, and the reasoning for a second battery is this, What happens if I drain the battery in front of a huge storm? Aye, I'm screwed.

    So, add a second battery, then drain that one, and have the first one to start the car so that the car can charge the second battery. Anyway, If anyone can help, i'd appreciate it!

    Ooop, almost forgot. On a Toyota, would I have to run 2 cables from the battery, (- and a +), or would I be able to go with just a positive from the battery to the positive terminal on the inverter, and then bolt a cable to the metal floor of the car and then to the negative terminal of the inverter?

    I've been told I can do this on a domestic because they have the battery grounded to the frame and body, I'm just not sure about imports.

  2. #2
    Raw Wave wizardPC's Avatar
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    I just pulled everything out of my car, including an entire 2nd battery setup.

    Basically, you need either an Isolator or an Isolator Relay (a 200 amp relay). With the Isolator Relay you run one of the coil wires (coil wires are what turn the relay on) to something that gets power when the engine is running and the other coil wire goes to ground (bare metal spot on the car)

    Then you take the other 2 posts on the relay and wire it like this:
    1st battery pos terminal---->Isolator Relay---->2nd battery pos terminal

    You would then ground the second battery's negative terminal to the chassis.

    YOU HAVE TO USE BIG CABLES for everything except the coil wires, unless you want to set your car on fire.

    I have everything you need except the battery (cause I cant ship that) for US$125 shipped. I would suggest, however, that you have a shop do it for you. You seem like a teenager perhaps and not so knowledgable about the proper way to wire stuff. You can destroy your car (flames, explosions, etc) if you don't do it right.
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  3. #3
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    Quote Originally Posted by wizardPC
    I have everything you need except the battery (cause I cant ship that) for US$125 shipped. I would suggest, however, that you have a shop do it for you. You seem like a teenager perhaps and not so knowledgable about the proper way to wire stuff. You can destroy your car (flames, explosions, etc) if you don't do it right.
    Hmm.. Just wondering if you have any pictures of the equipment..
    And yes, I would be a teenager.
    Oh, and where would you be located? I am defianetly giving this some thought, I just need to come up with 125 bucks, probably 150 or 160 by the time it crosses the border, if not more.

  4. #4
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    If, or when, you get a battery isolator, do not get the relay kind, when the car starts and the relay opens, the second battery will suck power from the charged one, drastically reducing your primary battery's life.

  5. #5
    Raw Wave wizardPC's Avatar
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    Quote Originally Posted by msb5150
    If, or when, you get a battery isolator, do not get the relay kind, when the car starts and the relay opens, the second battery will suck power from the charged one, drastically reducing your primary battery's life.
    oh yeah, there's that too. But you could get a huge fricken diode to prevent that.

    I'll get you some pics later. I gotta go to sleep
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  6. #6
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    Would this be of any help?

    http://painlessperformance.com/webca...at-battacc.htm

    Scroll down some for their dual battery control system. It goes for around 100 bucks for the regular one, to 170 for the waterproof one.

  7. #7
    Constant Bitrate Vineet Singh's Avatar
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    I had two batteries on the twin engine talon (one for each engine), but I found that one was enough, as long as the front engine was running when I tried to start the 2nd. I used 4awg jumper cables for about 9 feet to power the rear, with no problems. I ran a seperate ground too, but you don't HAVE to, the chassis is grounded on most modern cars, I just didn't want my grounds all over the place.

    I have a 90amp (I think) battery isolater that you can get from pepboys for around $100. I don't have a use for it, so I would take $40USD shipped to Canada.

    I tried to use this in my stealth which has the carpc in it, but since the "isolator" is really a giant diode for all practical purposes, it drops 13.8v from my alternator to 12.2~4. Not too bad, but I need 13.5+ for the fuel pump since it's modified, and I can't have it poop out at higher RPM's (running a little more boost than stock).

    Also, you could just carry one of the larger emergency "jump" packs they sell at auto stores and large walmart type places... it has a small lead acid battery in it, which has enough juice to start your car a couple times. They go for around 60 to 70 here in the US.

    Speaking of lead acid gel cell's, they are smaller and lighter than normal car batteries, and you can put them in any direction. I have one for the car, and one for the stereo, with a diode charging the stereo one. If I have a problem, I just put a jumper wire from the good "stereo" battery to the dead car battery. They weigh about 6kg each, and are about 3"x7"x6"

    Here is some (a lot actually) info about the batteries that have lasted me through 2 cars so far, and about 5 years. They don't have much reserve power left (17ah to begin with), but still work ok.

    http://www.stealth316.com/2-dynabatt.htm

    I got them from here I think, for around $70
    http://www.gotbatteries.com/

    Here are the instructions and pic of the 90amp isolator I have for sale
    http://www.pplmotorhomes.com/parts/r...y-isolator.pdf

    http://www.pplmotorhomes.com/parts/r...y-isolator.jpg

    Good luck! The emergency jump pack would be cheapest and simplest btw.

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  8. #8
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    Quote Originally Posted by Vineet Singh
    I had two batteries on the twin engine talon (one for each engine),
    Now i wanna see this!

  9. #9
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    Hi Derek, I'm a newbie, I don't want you to think I know what I'm talking about, but I got some good answers when I asked the same question here:

    Power Question, Two Battery Set Up
    A pic is worth a thousand words.

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