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  • 2nd Battery

    I was wondering if this is possible.

    How about have a 2nd battery and connect to a carPC then can it be possible to put a carPC in suspend mode automaticly when the car engin is off without worry about draining main battery?

    If this is possible it will be awsome setup.

    the computer will be alway in suspend mode so I can start the computer really fast.

    This was what I was thinking.

    have a 2nd battery in the trunk and have a CarPC to have power from 2nd battery ONLY when the engin is off and when the engin is running switch back to main battery, this way even if the 2nd battery got drained out , the computer won't have a problem to start or use .
    And the 2nd battery will be recharge while the car is running.

    When the car engin is off , by using simple program or relay to put computer in suspend mode automaticlly and using other relay system to get power from ONLY 2nd battery.

    And when if the 2nd battery is almost drained out, make the computer to shut off saftly (just like laptop battery system).
    When the engin is on, the computer will be restart perfectly by using main battery power and also the 2nd battery will be recharge too.

    How do you think about this idea?
    If this is possble , there is so many thing you can do with CarPC such as alarm system. One thing I want to do is when the alarm is on , have a computer to record video image around the car using video cam.

    One thing I was wondering is how long the battery will last. But I don't think it will be big deal.


    Any way what do you think about this idea?
    How kinds other problems can there be for this system?




    What if ?

  • #2
    How I can achieve this?

    do you have any suggestions?

    Thanks

    Comment


    • #3
      maybe this

      http://www.oznium.com/relay200

      or

      http://www.oznium.com/relay80

      Comment


      • #4
        I am using that relay with two batteries. It works really well and there is no way I could drain my starting battery.
        2007 Tahoe
        Opus with iBase 896 and Pentium M 735 Transflective Xenarc Alpine DVA-9861, PXA-H900, Sinfoni 45X2 (2) 90x2, Genesis Dual Mono, JL 1000/1 (2), Focal Be tweeters, ScanSpeak Revelator Mids, Dynaudio MW170, Dayton 12" Ref.

        My Install

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        • #5
          this can be done, but there are 2 problems to face,1 is that the battery will still be depleated, & normal car batteries don't enjoy constantly cycling like this... won't last too long unless you use a deep cycle type battery...

          2nd problem is depending on how much driving you do, the battery may not have a chance to fully recharge between parking cycles, so it will eventually go dead anyway...

          there are a few variables to work out with a setup like this, & the best way for it to be sucessful is deep cycle & a big killer alt that can recharge the battery relatively fast, while still providing enough excess amperage for the main use of the alt...
          MY NEWEST INSTALL:modded infiniti fx with big screen

          first windows carpc install........my liquid cooled LVDS screen :D

          Comment


          • #6
            Originally posted by Naamanf View Post
            I am using that relay with two batteries. It works really well and there is no way I could drain my starting battery.
            I have pretty much the same thing, sorta like this -





            Works a treat, I can leave the carputer running when I just slip into the corner shop etc, and even if I forget it is on, it will not kill the cars battery.

            Panda
            Car - Ford Falcon XR6 Turbo, footwell lights, Pioneer front speakers
            Carputer- P3 966MHz, 256MB RAM, 200GB HDD, 300W PSU

            Comment


            • #7
              I use a $2 40A relay and it works well. I don't think the current would be anywhere close to 40A... the second battery also makes the computer survives cranking easily, as during cranking the main battery is disconnected.

              Comment


              • #8
                i just got the stinger200 installed this weekend. working like a treat so far
                mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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                Comment


                • #9
                  Any chance you have pictures of your setup Sonicxtacy02?

                  or are there any wire diagrams for the Stingers?

                  -The Endless Loop-

                  Comment


                  • #10
                    but with the diagram abowe if the tank battery is drained out i can't start the carpc also if the engin is running..isn't so?

                    do I need another switch to power the carpc from 2nd battery ONLY when the engin is off and when the engin is running switch back to main battery?

                    Can you post me a diagram? I'm not an electronic..

                    Thanks

                    Comment


                    • #11
                      i dont have any pictures yet as my wires are in a big ball of mess still right now.. i'll tidy it up this weekend and post though.

                      wiring the stinger was a snap though, run one wire from the main battery to it, one wire from it to new battery, a small ground and a small remote turn on wire and i was all set. i used 4 gauge for the power wires and fused it to 80 amps. i DID still manage to run my main battery low one day after several hours of leaving the car on but that was probably because i wired the remote to a NON-ignition wire, meaning the stinger's relay was triggered even though the car wasnt running, only in the first key position.
                      mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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                      • #12
                        i've got a


                        and a yellow top optima

                        works spot on
                        2001 Passat 130TDi Sport - Via Epia 15000, 1gb, 100gb, 220w psu, 7" lilliput motorized touch (chopped and in dash as a fixed), bluetooth, bu-303 gps, 7 port usb hub, tiny keyboard, netgear 54mb wifi, optima yellow top, ryder rt1170x, freecom dvb

                        Comment


                        • #13
                          Originally posted by Serfio View Post
                          but with the diagram abowe if the tank battery is drained out i can't start the carpc also if the engin is running..isn't so?

                          do I need another switch to power the carpc from 2nd battery ONLY when the engin is off and when the engin is running switch back to main battery?

                          Can you post me a diagram? I'm not an electronic..

                          Thanks
                          this is my $2 setup, fuses near car, pc batteries and PSU not shown. the PC battery is disconnected from car battery when you turn car off (ACC off), and during engine cranking (some cars may not disconnect during cranking).
                          Code:
                                            +------+
                                    ACC ----| coil |----- GND
                                         85 +------+ 86    
                                                                        +------+
                           Car Battery ----+      +-----------------+---| PSU  | 
                                        30  \    87                 |   +------+
                                             \                      |
                                                                   PC
                                                                 battery

                          Comment


                          • #14
                            Check this thread http://www.mp3car.com/vbulletin/showthread.php?t=74124
                            The old setup http://flickr.com/photos/ilyassx
                            The new setup http://my.opera.com/ilyassx/albums/show.dml?id=110701
                            Jetway J7F2WE VIA C7 1.5 GHz
                            512 DDRII 533
                            3.5" SATA2 H.D.D 200GB
                            M1-ATX
                            ELM327MS OBDII
                            Creative Audigy 4
                            PROGRESS:[########-]90%

                            Comment


                            • #15
                              Originally posted by ming View Post
                              this is my $2 setup, fuses near car, pc batteries and PSU not shown. the PC battery is disconnected from car battery when you turn car off (ACC off), and during engine cranking (some cars may not disconnect during cranking).
                              Code:
                                                +------+
                                        ACC ----| coil |----- GND
                                             85 +------+ 86    
                                                                            +------+
                               Car Battery ----+      +-----------------+---| PSU  | 
                                            30  \    87                 |   +------+
                                                 \                      |
                                                                       PC
                                                                     battery
                              I cannot understand the meant of these numbers
                              85=?
                              86=?
                              87=?
                              30=?

                              Can you (or somebody) explain me What they means?

                              Thanks

                              Comment

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