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  • Adding battery to system

    anyone every add a battery, i know you can relocate it to the trunk pretty easy but what about adding a second battery in the trunk

  • #2
    Sure, but what do you think the benefit will be?
    TruckinMP3
    D201GLY2, DC-DC power, 3.5 inch SATA

    Yes, you should search... and Yes, It has been covered before!

    Read the FAQ!

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    • #3
      The FAQ Emporium has an article on adding a battery, called a 'tank circuit'.

      You have to include circuitry to prevent one battery from draining the other one.
      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

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      • #4
        Originally posted by TruckinMP3 View Post
        Sure, but what do you think the benefit will be?
        a battery to run my electronics on, my bat to start my car keeps draining if i dont drive it for a few weeks and since this is my fun vehicle i dont want to come out to a dead battery when i want to drive it.

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        • #5
          If you drive it infrequently, you don't need a second battery. You need to have the PC shutdown completely or hibernate when you turn the car off.

          The max you are going to be able to sleep your computer without draining a secondary battery is going to be a week or perhaps a little longer.

          Shutdown will shut the computer OFF and stop any drain at all.
          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

          Comment


          • #6
            I had to go to a second battery with the older vehicle(95 GMC van) that I have. I could never over come the PC shutting down and restart of the vehicle and yes I had a smart DC-DC (M2-ATX)power supply.

            Go to your nearest Stereo shop and have them setup battery backup like they would for Stereo and hook that up to the PC.

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            • #7
              Originally posted by Bugbyte View Post
              If you drive it infrequently, you don't need a second battery. You need to have the PC shutdown completely or hibernate when you turn the car off.

              The max you are going to be able to sleep your computer without draining a secondary battery is going to be a week or perhaps a little longer.

              Shutdown will shut the computer OFF and stop any drain at all.

              I did, i installed a cut off switch, i used the 12v yellow ign wire from the stereo harness and installed a switch so i could turn it on and off.

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              • #8
                Originally posted by Bugbyte View Post
                If you drive it infrequently, you don't need a second battery. You need to have the PC shutdown completely or hibernate when you turn the car off.

                The max you are going to be able to sleep your computer without draining a secondary battery is going to be a week or perhaps a little longer.

                Shutdown will shut the computer OFF and stop any drain at all.
                If I leave my Toyota Taco for too long without driving it, the battery will be discharged just from the stock equipment like the keyless entry that is on all the time. It will be more than a week before that happens, but not months like an old vehicle I have that has no continuous small loads on the battery.

                Tank circuit seems to be a mp3car-ism I've not seen used anywhere else for a dual battery setup. A tank circuit to most people is an inductor-capacitor resonant circuit. See http://en.wikipedia.org/wiki/LC_circuit. A better thing to do is search for battery isolators. There must be at least a couple dozen different brands from heavy-duty solenoids with a controller to electronic switches. Lots of off-road people use dual batteries to provide extra power for winching or as a backup. Some use the second battery to run accessories like lights and refrigerators overnight and don't want to discharge their main starting battery. If I had my way, I'd redesign the electrical system so only the starter and engine contol module was on one battery and everything else including the stock equipment like lights and radio was on another battery, but thats a pretty involved project.

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                • #9
                  I got a 2nd in the trunk.

                  this is my isolator
                  http://www.grainger.com/Grainger/items/6C028

                  and i use 2 relays, one that turns the solenoid on with ign on and one that shuts if off when the starter starts(dont want it blowing fuses and what not).
                  Core duo
                  1tb harddrive
                  256 ddr
                  8 lilliput
                  bu-353

                  still installing...

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                  • #10
                    why not make it easy and just use a battery isolator?

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                    • #11
                      I put in a second battery last Christmas and it was one of the best things I've done. Before that I felt like i was rolling the dice every time I turned the key. I never really knew if the car was going to start. Although I set the pc to standby on power down, there where plenty of times when the PC locked up and refused to power down. The DSATX didn't have a hard kill feature until the latest firmware.

                      Like above, I used a constant duty relay, (a used stinger sr200 from ebay). The battery I got is a deep cycle, dry cell (Odyssey PC925MJ) and it fits under the storage compartment in my center console.

                      The reason you don't want a battery isolator (aka split charge relay), as explained to me by an engineer at a battery factory, is that there is a significant voltage drop across its internal components, and the battery would not be properly recharged.

                      With the constant duty relay, it physically separates the batteries when the car is off and reconnects them while running (acc hot actually). I have not thus far had any problems cranking.

                      I purchased a cheapo amp wiring kit to connect them together and there were just a few other parts necessary that I was able to get from Walmart or Autozone.


                      Good luck.
                      '03 Escape 4WD:
                      -iTox mini-itx mobo, Core 2 Duo Mobile 1.66Ghz; 2GB, 80GB 2.5" HD, DS-ATX
                      -Transflective 8.4"
                      -XM, iG4, OBD-II (BR-3)
                      -Rearview camera with auto-switching (modified cheesbox)
                      -Slim Slot DVD+RW
                      -RR, DFX 4

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                      • #12
                        well, its true there is a voltage loss but it wouldnt matter for a 12v pc system. for car audio- YES, you loose a lot of power every point you go down from 14.4v. but pc's just need 12v, and thats easy with a battery and isolator. the isolators are made for this purpose specifically, to charge a second battery and use it without killing or ****in up your first battery. as far as 'properly charging'... i guess it could take a little longer to reach 12v but youre not going to hurt a car battery by charging it with less amps then normal....

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