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Thread: System Restarts whenever I start my car

  1. #1
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    Unhappy System Restarts whenever I start my car

    Every time I start my car my computer reboots. The car is only a couple of years old. I have a dc-dc supply from keypower. I have also tried it with an inverter and had the same problem. The inverter would always beep indicating low power when I was starting my car. Any Ideas???

  2. #2
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    Either get a bigger battery, or get a second battery exclusivly for the carputer, and some sort of aux battery controler, to make sure that it charges, and doesn't drain when the car is being cranked.
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  3. #3
    Retired Admin Aaron Cake's Avatar
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    Cool

    Have your battery load tested. Sounds like it is losing capacity.
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  4. #4
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    I had my DC-DC psu temporarily plugged into my cig lighter for power. whenever I started the car the computer would reboot. As soon as I found another power source the problem went away.
    Some cars turn off all ignition sourced power to start the engine. If you take a look your radio probably cuts off too when you start the engine. I have no idea how old my Batt/Alternator are. All it took for me was getting power from the right place!
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  5. #5
    FLAC
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    I agree with Falcon62Travis....Most car do just that.
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  6. #6
    FLAC
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    Falcon62Travis/cenwesi have probably hit the nail on the head..... but with most cars it does take a bit of battery juice to kick over an alternator..... but seriously is it really such a bit problem anyway?
    Project - GAME OVER :(

  7. #7
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    I've run the power directly from the battery. I plan on having the battery checked out. It's really no that big of deal, but it would be nice not to have to wait for it to reboot after going into the store for just a few minutes.

  8. #8
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    I think it's battery problem, if you go to a shop to check battery , they might tell you the battery is ok.

    It's b/c , when the car engin cranks the volt of the battery can go down to 8V (specially in cold weather). If you have a voltmeter check if it does it when it cranks.
    and your computer reboots b/c it doesn't get enough power to run. It's not your power supply of the inverter problem.

    Your battery might be ok for your car yet but for your computer it's diffferent story.
    If you are going to get new battery, I recommend Optima Yellow top Battery. It's little expensive but it's one of the best battery you can get. look around for best price. Try shopping.yahoo.com , I think I saw it for around $135 one time.

    If you are useing a lot of power from battery (such as AMP. , computer , & etc) you need good strong battery.

  9. #9
    FLAC
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    You guys all have it wrong. I found a simple solution, you don't need to buy a big battery, you don't need to spend 100 bucks on a aux battery, (all though that would work and be effective if you don't mind lugging around another battery!) If your using a DC to DC converter or a DC-AC inverter, chances are it has some threshold voltage at which it shuts down. If you are restarting during your engine start, it is because the voltage drops below that threshold voltage of 8 volts, or 10 or 4 or whatever it happens to be. If you look at it on an oscilliscope during an engine start, you could see what it looks like. The solution I used was to feed my DC-DC converter with a little one way tank circuit low pass filter consisting of a high current Schottky barrier diode and a large filter cap. The schottky barrier diode has a forward operating voltage of .4-.5 volts or so, but it's not a problem. When I start the car the tank capacitor makes up for the loss in voltage. It's pretty easy to make but if you want, I'll make you one for 10 bucks or so.

    Before I used this method, MpegBox would restart every time I started my car, even if I just started it as fast as I could with a little jerk of the key.

    This will only work as long as your battery doesn't get too drained from powering the mp3 player. I can go and get gas, or run into a mini mart but if I leave the thing sucking 3 amps for more than 10 minutes with the car off, I'm pretty much screwed if I want to start my car. But then again I have a little honda accord battery that has been completly killed a few times.. :-)

    Hope this helps.

    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  10. #10
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    Yeah, Jeff knows what he's talking about. That's exactly why your PC keeps kicking off/on. In fact, the voltage fluctuations could really mess with electronics if your ignition system didn't temporarily cut out when you turn the key. Going straight to the battery negates the ignition cutout. I, too, plan on hooking straight to the battery.
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