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Thread: powering computer from battery

  1. #1
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    powering computer from battery

    I have been reading on how to power a carputer, and I got most of it down So what I was going to do was purchase a DC-AC inverter which opperates off the cigarette lighter, but lop of the plug and wire it directly to the car. I read that you can just wire it directly to your battery. If I do it this way, will it turn off when I turn the car off, or will it keep draining the battery?

    What's the best way to wire it, so it will turn off when the car is?

    thx

  2. #2
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    Hi

    Hi ya,

    I am also using an inverter.

    I took of the cigerete lighter plug already on it and put some crocodile clips on the ends instaed and just connected it directly to the battery. (This was just to test it mainly)

    I have it working of the battery but from what i can tell you should only realy have it on when the engine is running. If you only have the inverter directly connected to the car battery you have to turn the computer on manualy and just turning the engine off will not turn the computer off as it is still getting a good current from the battery.

    I also would like to know the best way of wiring the carputer up aswell - I am happy that my inverter and carputer now work together so would prefer to have it come on when i turn the key in my car.

    What are the best ways to do this??

    Another problem with the way mine is wired at the moment is that when I turn the engine on the screen gets lines down it (like interferance or a shaky voltage is going into the carputer) Is there a way to stop this??? - Somehow making sure a constant 12V supply go's to the inverter??

    n e how many questions there

    Hope somone can help

    Cheers

    Chris

  3. #3
    Maximum Bitrate CrazyLittle's Avatar
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    Re: Hi

    Originally posted by tilezzzzz
    would prefer to have it come on when i turn the key in my car.
    What are the best ways to do this??
    You'll need to wire a relay circuit into your invertor's power supply line, which is triggered by the ACC line. A 10 amp @ 12 volt single pole/momentary (One that's only on when there's current running through the coil circuit) should do it. That way when you turn the key and the ACC circuits turn on (for A/C & radio, etc...) Then the coil charges up, and turns your invertor on.

    Somehow making sure a constant 12V supply go's to the inverter??
    Do a search for "tank circuit". You may have to build a voltage regulator downstream from a tank circuit in order to smooth out the power for your display.

  4. #4
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    So with the relay do we still connect to the battery, but now the relay sits inbetween the battery and the computer, and with a connection to the ACC, or does it connect directly to the ACC and the inverter.

    And, where is a good place to pick up a relay like you described?

    thanks

  5. #5
    Maximum Bitrate CrazyLittle's Avatar
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    Search through the forums - it's all been discussed before. Search for "relay" and "ACC" or "Accessory"

  6. #6
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    doing a relay on the acc line will creat one problem anytime you turn off the car and don't shut down the puter first windows will complain
    WINNER!!!!
    run-on sentance comp 2002!!
    :)

  7. #7
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    I think they were talking about shutting down the car without shutting down inverter you could use a time delay with a relay for the inverter if you wanted that to shut down also

  8. #8
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    Originally posted by 98explorerxlt
    I think they were talking about shutting down the car without shutting down inverter you could use a time delay with a relay for the inverter if you wanted that to shut down also
    I'm doing this a slightly different way.

    My PC is operated by an inverter hardwired to the battery.
    I'm putting a relay into the power line and instead of using the acc line to trigger the relay coil, I'm using the Headunit Antenna trigger line (already using a power antenna), and an FM modulator.

    When the Headunit is on, the inverter gets power.

    The headunit is permanent hot wired, rather than ign/acc controlled, so i can switch off the car, while shutdown is in operation, with the headunit switched on, then just switch off the headunit, once it has shutdown. And it is a fully ACPI complient mobo so I can shutdown with a single press of the power button, or the power button on the remote I'm using with Girder.

    Also, as I have a turbo car (oil only cooled turbo) I need to give a minute or so after driving to let the turbo cool. that also gives me time to run a shutdown.

    I'm currently at the stage of making the screen mount (using a Playstation2 7" STN screen), and building the case, while testing the build on the dining room table.

    The inverter is installed and mounted, and I got an argosy USB2 8x DVD slim external drive that will poke out from under the rear seats for physical CD/DVD changing, plus I plan to use Daemon Tools for Virtual DVD drives, so I can keep mostly used discs as images mounted ready to go.
    4x4 in a turbo stylee.

  9. #9
    Maximum Bitrate CrazyLittle's Avatar
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    Originally posted by oddcomp
    doing a relay on the acc line will creat one problem anytime you turn off the car and don't shut down the puter first windows will complain
    Depends. If you're running Win9x/ME you can turn off Scandisk. In addition to that, you don't have to fear shutting your computer down improperly unless you're writing data.

  10. #10
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    I searched on where to buy one of those relays, but I am not sure exactly what I am looking for. Could somone please give me a link to where I can buy one?

    tx

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