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Ignition Voltage Gap kills everything

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  • Ignition Voltage Gap kills everything

    Hey all
    I'm having problem with ignition voltage gap. If my comp is on and then i'm starting the car (voltage drops to 9v) everything gets frozen and i have to reboot. Does any one know the easy way round this problem?

    Thanks!
    Acura / Honda A/V CarPC Adapter GA-NET+
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  • #2
    A beefier capacity battery will help, but not much if the PSU isn't capable of handling low voltage for a short time.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
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    • #3
      Does any one know the easy way round this problem?
      Don't turn you pc on until after your car is started.

      As for actual solution to the problem - any of the following should work if executed corrently:
      - Look for a powersupply that works under cranking
      - Secondary battery
      - A huge *** capaciator (likely not an econmonical solution)

      However before doing any of the above - I'd check your wiring. To small a wire and/or poor grounds creates voltage drop. Combine that with voltage drop while cranking and you are likely to go below your powersupplies minimum voltage limit.

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      • #4
        well so far i tried Diode + 12,000 mili Farads Capacitor... I cant really change PSU, since its not changable in my Monitor and All IN one embeded board.

        I'm thinking about UPS, but the once on the market got some potential problem
        So i might end up building my own custom UPS to meet my requirements BUT i dont want build custom things any more, unlesss some omne else would wanna use it besides me (cost repreciation)

        I'f i dont find good comercially avalible UPS (so fart found one but as i mentioned dont like it) I'm thinkingh about mini controller that can be programeed any way you want + the ona that would have at least 24hours battery + 30min Startup Batteru ... um 25AH maybe? um no 40AH (damn thats like 6 Batery blocks, too much space) any way something like that, i'm just starting my recerch... thats why I asked on forum to make sure that there is no something similar offrered...

        PS: Sorry for my spelling, just came out of the party
        Acura / Honda A/V CarPC Adapter GA-NET+
        Centrafuse Garmin Mobile PC Skin - GMPC Rebellium Skin
        3D Tuning and Car Visualizer - Preview your car in 3D, change paint job and rims

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        • #5
          One option not mentioned: A tank circuit.

          It might be easier to offer up solutions if we knew what your system was comprised of...
          Have you looked in the FAQ yet?
          How about the Wiki?



          Under normal circumstances, a signature would go here.

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          • #6
            A tank circuit - what is that, I never heard of it?

            Ssytem:
            8" Monitor OEM ~1.3A
            Comp = 15W @12V
            Cameras = 1.5A
            GPRS = 0.3A
            Wi-Fi = 0.8 A

            And who knows what else can I add in the future. Oh I forgot Radio + USB hubs, I dont know their power usage
            Acura / Honda A/V CarPC Adapter GA-NET+
            Centrafuse Garmin Mobile PC Skin - GMPC Rebellium Skin
            3D Tuning and Car Visualizer - Preview your car in 3D, change paint job and rims

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            • #7
              Originally posted by tempgp View Post
              A tank circuit - what is that, I never heard of it?
              Time to make use of the infamous search function.
              I'm also certain there's a writeup on them in the FAQ Emporium.

              I've never needed to use or make one, so I'm certainly not the expert.
              Have you looked in the FAQ yet?
              How about the Wiki?



              Under normal circumstances, a signature would go here.

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              • #8
                I think darque was refering to how your system is powered and what the components are (ie; dsatx, opus, etc)

                Are you using an inverter or a dc-dc power solution?

                Most dc-dc's survive crank if your battery is healthy.

                Inverters are a "hit and miss" proposition with cranking...................
                For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
                Leonardo Da Vinci

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                • #9
                  ok will google "tank circuit"
                  as to what power supply im using,, well all powersuplies are build in and technically designed for cars 12v (which seams not be a true statement) I can try to use DC-DC poresupply to tweak it and put in the middle beween my equipment aand car bus.... will that work?
                  Acura / Honda A/V CarPC Adapter GA-NET+
                  Centrafuse Garmin Mobile PC Skin - GMPC Rebellium Skin
                  3D Tuning and Car Visualizer - Preview your car in 3D, change paint job and rims

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                  • #10
                    Originally posted by tempgp View Post
                    ok will google "tank circuit"
                    as to what power supply im using,, well all powersuplies are build in and technically designed for cars 12v (which seams not be a true statement) I can try to use DC-DC poresupply to tweak it and put in the middle beween my equipment aand car bus.... will that work?
                    You don't need to google, use the seach feature in the blue bar at the top of this page.

                    As to the rest, I don't know where to start with that..........................

                    Methinks you need to do a bit more research.

                    Good luck with your project.
                    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
                    Leonardo Da Vinci

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                    • #11
                      well i guess will se what i can find
                      Acura / Honda A/V CarPC Adapter GA-NET+
                      Centrafuse Garmin Mobile PC Skin - GMPC Rebellium Skin
                      3D Tuning and Car Visualizer - Preview your car in 3D, change paint job and rims

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                      • #12
                        I'm not sure, but it seems like, since your embedded computer has it's own internal power supply, you've just hooked it to the vehicle's positive. Perhaps a 12V DC-DC regulator from carnetix would be the best/easiest fix.

                        Ok, enough with the suspense: What computer are you using?
                        It's been a while...

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                        • #13
                          Where are you measuring the 9V from? 9V seems low for cranking voltage. Measure voltage at the battery while cranking. If that is above 10V (which it should be if your car is starting without problem) then you need better wiring and grounding to your CarPC. You could do a quick test by temporarily wiring up your CarPC power supply directly to the battery, both power and ground (do not ground to chassis), and if it helps.

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