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Thread: Suggestions

  1. #1
    mc
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    Question Suggestions

    ok, heres my problem
    my computer is running in my car, but lets say i try to turn on the air while my foot is on the brake, the puter turns off, while its in park i have to rev the engine, ok so last night i get some new fogs put in, and while backing up into a parking space the puter shuts off, so my question is how hard would it be to hook up another battery just for the computer, space doesnt really matter, i just need to know how simple it is,
    BTW i dont know what wattage the fogs are but i have hyper super duper plasma white or whatever, and i have plasma white as night lights so im kinda at a dead end here
    Music is the language, love is the message.

  2. #2
    Maximum Bitrate gizmomkr's Avatar
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    Well, this was covered in a lot of other hardware posts but.....

    You got some serious issues.

    Im guessing your using an inverter.

    Has the problem just started, or is it alwayse like this ? How much other stuff is running off your car ? ( CB, Amps, fog lights Etc. )

    Without the answers to those questions, I would say you have 2 possible problems .

    Your alternator is overloading. or your batery is just going bad.

    Take the car in and ask them to check the electrical system.

    If the electrical system checks out, and its still rebooting, your inverter just sucks.

    The thing about adding a batery is :
    In a 2 batery setup, you normally charge both bateries while the car is running, and run some sort of accessory off the AUX bat when the car is NOT running. If the car is having trouble charging 1 bat and runing the computer, I doubt it can charge 2 bateries and run the computer. Unless the second batery has a lot of amperage.... But I think you should have the alternator / exectrical checked first.



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    Gizmo-
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    Gizmo-
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  3. #3
    mc
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    Question

    im running car, fogs, and computer, i think its the alternator, its a good car just alot of miles so a new will come right up thanks for your response.
    Music is the language, love is the message.

  4. #4
    Constant Bitrate
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    Hooking up a seperate battery for just the computer (or all electronics) is a bit tough. First you'd need a high output alternator to keep both batteries charged. Then you'd need to find space to mount the battery, plus run all new wires. You could probably keep the existing battery, just get a bigger, stronger alternator. Although it is possible that your current alternator is going bad. Bring it into pep boys, they test it for free.

  5. #5
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    Plus you'll also need a battery isolator otherwise adding a second battery won't do much other than load up your alternator more. With an isolator you can draw power all day from the secondary battery and not affect the rest of your car's electrical system. I know of someone with a late model BMW that has a setup like this with a 1000W inverter and a DJ amplifier running 2 15" subs!
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

  6. #6
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    I had this problem too when I put my mp3 player in my new ride. As a temporary fix, I just had the inverter plugged into the cigarette lighter. At idle, it would squeal (low voltage/amps) and the player would die.

    I installed a sub and amp and ran a 4 gauge cable directly from the battery to a brass distribution block (made by Monster Cable i think) to power my amp and inverter. I've got a simple relay that turns on with the head unit that completes the circuit to the inverter. The distribution block and heavy gauge cable eliminated the low power issue altogether.

  7. #7
    Bj
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    Wiring. That's all you need to know

    Use a heavy gauge cable from your battery to your inverter or DCDC and all your problems will disappear You have toooooo much of a voltage drop from your battery to the PC. The reason your PC stops at idle, is because the altenator is not up at 14.4V when you are idling, you may only have 13.0V available at the battery. When you then take this voltage off to your PC via tiny cheap cable, you may only have 10.5V at the inverter, (depending on what the current consumption is) and this will cause your inverter to stop, shutdown due to low voltage.

    This problem can also occur because your battery is getting old, and it can't keep up to the load of your car when you idle.

    Get your battery checked, and then proceed to installing at least 8 gauge cable (if your PC is in the back) and you'll be home free

    Catcha

    Bj

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  8. #8
    Maximum Bitrate gizmomkr's Avatar
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    Ok, Its late, Im board Im in "Picky *****y bastard mode" Cable size has nothing to do with voltage. You can run 300 volts over 24 Gauge wire. Its amperage.

    You cant push a lot of amperage through small wire.

    The voltage may be droping, and thats part of the problem, but the REASON for the voltage drop is something in the electrical system. the reason for a drop in amperage is the wire, but more likely again the electrical system.
    Gizmo-
    Techonlogy on Wheels
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  9. #9
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    There _is_ voltage drop down cable, gizmomkr. How much depends on the length and gauge of the cable.

  10. #10
    Maximum Bitrate gizmomkr's Avatar
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    Ok, there *IS* loss of anny signal over cable. but I PROMISE, If you get out the DVM, and hook it to the lighter socket, Its going the read the same damn number ANNYWHERE in your car!

    The drop is tiny, miniscule, minute, - over that kind of distance.

    Over a thousand feet of cable, you would probably see like .5 to 1 volt drop.

    There is a formula for it. Cant remember right now.... attenuation.... resistance.... E=mc2

    But I promise, you will never see a drop in voltage over a cable in your car.

    One more time - A M P ' S

    If you dont believe me, try this :

    get 5 feet of cat 5. and five feet of 4 gauge wire.

    Disconnect the + lead from your car to the battery. connect the 4 gauge wire to the battery. Test for voltage ( somewhere around 12V) hook the other end to the + wire from the car.
    Crank the car.

    now, disconnect, and place the cat 5 cable in its place. test for voltage - Guess what !, still 12v. now crank the car.

    Let me know what happens.
    Gizmo-
    Techonlogy on Wheels
    http://www.hjnetworks.com/car

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