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UPS direct connect to car battery?

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  • UPS direct connect to car battery?

    guys great site!

    Im sorry if this has been asked before, but i did do a search before posting and couldnt find anything.

    I got myself here a spare sff pc and an APC smart series ups with a dead battery.

    The battery in the ups is a 12v dc, and I was wondering if I could directly connect the cars battery to the ups. (properly fused).

    What are the pros and cons of this?

    I know I should just get an inverter or a dc to dc but im just a poor little student who wants to do something over the weekend.

    thanks in advance.

  • #2
    Uhhh, no.
    Have you looked in the FAQ yet?
    How about the Wiki?

    Under normal circumstances, a signature would go here.


    • #3
      ya....thats not a good will probably end up draining your car battery.

      i actually work for apc....
      Car: 2002 Nissan Altima
      Computer: Powerbook G4 12"

      Current Status: 7 %
      - audio inputs are done!
      - front row is installed!

      Current pics of my install


      • #4
        Get an inverter, cheap solution but not really the best. If you plan and carefull when installing, inverter is as good as DC-DC solution.
        But if you have to buy a Shutdown Controller, I would suggest you go with the DC-DC route cuz those already have the SDC built-in and the total cost isn't that much different (if you get the M2).
        2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
        89 Supra Turbo P3 [email protected]/Abit BE6 II, Alpine M-BUS Car2PC.
        Y2K Accord Dell GX150
        RoadRunner is the best FE PERIOD
        EmoRebellion is a SCAMMER


        • #5
          In this site is what you are looking for.....if you understand portuguese


          • #6
            [QUOTE=wheli]ya....thats not a good will probably end up draining your car battery.

            You got to have a diode


            • #7
              guys thanks for the replies!

              So I guess this is a bad idea even if i take steps to make sure that I dont drain my battery right?

              But isnt the ups an inverter? Is it a different kind of inverter?


              • #8
                No. An inverter turns DC power into AC power. A UPS turns AC power into DC power, keeps a battery charged, and if the power fails, turns that DC power into AC power.

                It is probably possible to hack a UPS into your car so you can skip the AC power in issue but you'd need to know more about electronics than you probably do.

                Get an inverter, plug the UPS into it, then plug your computer into it. Make SURE you have a switch to shut the inverter off each time you turn the car off. Some inverters will continue to draw power even if "off".
                Originally posted by ghettocruzer
                I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
                Want to:
                -Find out about the new iBug iPad install?
                -Find out about carPC's in just 5 minutes? View the Car PC 101 video


                • #9
                  okies thanks for the help. Gonna look for an inverter now. Thanks for the help.


                  • #10
                    Also, UPS units aren't designed to operate off of a larger battery than was designed. It will overheat, and possibly catch fire depending on how long you try and power your PC off of it.

                    I read that somewhere.

                    Try RevFE
                    The best resurrected frontend I've ever used, period.


                    • #11
                      Every UPS I've tried hooking up to an inverter has choked (acted like there was no AC input even when there was)...something about UPS's not liking the square-wave output of most inverters perhaps? I went and bought 6 of the damn things (all different brands & models) one afternoon and took em out to plug into the inverter & test (btw, used a HUGE 3000watt inverter in that setup). Every one of em choked. Took em all back.


                      • #12
                        I'm using a Blackout Buster (by PK Electronics, which sadly, no longer exists) along with the inverter in my Carpc setup. I hacked into the UPS and added a simple 'extension' to the power switch that hooks up to one of the contact-closure relays on my power controller. Thankfully it's one of those UPS's that has an ON/OFF switch and not just a soft-power. It still gives me about 5-10 mins of power with no problems.

                        I've run into a few UPSs that don't like the inverter. Such as CyberPower UPS strips.