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Thread: Does anyone know how to create dual battery setup?

  1. #1
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    Does anyone know how to create dual battery setup?

    Just like to know does anyone know how to create a dual battery setup and if you have any info could you please post would be very helpfull.

    Thanks

  2. #2
    Low Bitrate M11VNY's Avatar
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    Yep!

    Had one in my old car,

    Put the battery in the boot (if thats where its gonna go), Earth the negative of the battery well to the car chasis. You can then run a 4 gauge wire from the positive to the back battery.

    But you will need to put a split charger relay on the link as if kept connected whilst the car is not running the two batterys will discharge each other. The cheapest one I found was at maplins.

    For something like 15. you will need to connect the relay to the ignition, which activate the relay once car is running and charge the back battery. Or you could just have a switch but you run the risk of forgetting it switched on!!
    Its down!!!! Sold the Golf so took it out, it's still alive but not installed.

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  3. #3
    Admin. Linux loser.
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    Bugbyte's Avatar
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    Search on terms "tank circuit". There's tons of info on how to do it.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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    A pic is worth a thousand words.

  5. #5
    Low Bitrate GRod's Avatar
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    I have a dual battery set-up in my truck (one for all my goodies ) and one for running the truck. You can check out my setup at this link http://fordtruckworld.tenmagazines.c...-1-album-21509 and this one http://fordtruckworld.tenmagazines.c...ery.ten?id=288

    I got all my supplies from these guys http://www.wranglernw.com - they have the dual battery trays, solenoids, switches - everything you need - plus they are very helpful and patient with your and your questions. Here's a link to their dual battery application catalog - while for trucks, I'm sure they could help you with your application in any vehicle. http://www.wranglernw.com/flyers/Wra...%20Catalog.pdf

    Good Luck!

    GRod
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  6. #6
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    Quote Originally Posted by M11VNY

    But you will need to put a split charger relay on the link as if kept connected whilst the car is not running the two batterys will discharge each other. The cheapest one I found was at maplins.
    The main reason for the split charger is so that you do not set fire to the vehicle.
    if you connect a second battery with a cable that is not large enough to withstand cranking amps and the main battery is not fully charged, the starter motor will try to draw current from the second battery and the thinner wire will overheat and melt. If you need any advice about fitting a split charging system, go and see your local caravan dealer.

  7. #7
    Maximum Bitrate DeltaFX's Avatar
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    Or add a big diode between main battery and puter battery on the + line. Alternator will charge both, and when cranking, the diode will prevent sucking juice from the pc battery

  8. #8
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    Bugbyte's Avatar
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    A schottkey diode prevents this and eliminates the need for a separate charging circuit. The plans are on here, just....(rhymes with lurch)
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  9. #9
    It ain't easy being a green moderator meddler's Avatar
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    try this... Credit for this circuit goes to my mate Darren Pollard. I'll clean is up and repost when I have time. Basically once the alternator puts out a voltage on the indicate line the 12V contactor is closed hence charging the second battery. This contactor can be manually shut by pressing the push button illuminated switch. Disregard prices, they are in AU$
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  10. #10
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    Meddler's way of charging the second battery is way over the top, you just really need the 30amp relay. If you did connect the second battery with normal starter motor cable, you would not need anything else as this would stand the cranking current.

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