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Thread: Two battery Setup for carputer

  1. #1
    One Sharp Cheddar ThunderStick's Avatar
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    Two battery Setup for carputer

    If I connect two batteries but only want one connected to my cars electrical system when it is running, can I use an automotive 30amp relay as an isolator.
    Meaning, when the car is either in run position or in accessory the relay will switch on allowing the second battery to be charged from the alternator.
    My purpose is to prevent a dead battery. I want to hook up the carputer to my second battery so that when my car is off and if the computer hangs or continues to pull power from my battery I dont wake up to a flat battery that wont start my car.
    My second battery will preferably be a deep cycle marine battery.
    Help is appreciated.
    Thanks
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  2. #2
    It ain't easy being a green moderator meddler's Avatar
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    There are two ways of doing this. One is with an isolator and the other is with a relay. Both have been discussed at length on this board.

    have a look here for a basic overview of the two setups. http://www.bcae1.com/battiso.htm

    If you search the forum, you will find heaps more info
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  3. #3
    One Sharp Cheddar ThunderStick's Avatar
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    I have searched the forums, but there is tons of blah blah blah I do not want to take the time to read through. I thought someone could just give me a simple yes or no.
    THanks
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  4. #4
    One Sharp Cheddar ThunderStick's Avatar
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    I do not wish to spend the cash for an isolator if a simple 30amp relay will work fine.
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  5. #5
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by ThunderStick View Post
    I have searched the forums, but there is tons of blah blah blah I do not want to take the time to read through.
    put your flame suite on. You will soon be bannished to the land of n00b.

    Quote Originally Posted by ThunderStick View Post
    I thought someone could just give me a simple yes or no.
    THanks
    Being computer people it is some proven thing that we do not try to waste our time with the trivial or with things already discussed. It has been proven through studies. So we usually do not give answers like this. We are a rude people.
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  6. #6
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    a 30 amp relay will burn out... you will need a solinoid & big wires..

    when that battery is dead & you start the car that circuit will flow a lot of juice, most of what your alt can put out really, & even more, as the dead battery will also suck from the main...

    the best way is an isolator

  7. #7
    One Sharp Cheddar ThunderStick's Avatar
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    Thanks for the input

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  8. #8
    One Sharp Cheddar ThunderStick's Avatar
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    THanks again just bought a stinger sr200 isolator.
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  9. #9
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by ThunderStick View Post
    Thanks for the input

    Damn that dancing skunk...He won't leave me alone
    BADGER!
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

  10. #10
    FLAC SnyperBob's Avatar
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    http://www.bcae1.com/battiso.htm

    Not sure how reputable, but looks like good info
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