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Thread: Battery based tank circuit (tested)

  1. #51
    Maximum Bitrate bertybassett's Avatar
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    rikcy I looking to power my custom made regulator 10v-18v. I've been given a free 38ah sealed battery do you think this is to powerfully for using as a spare battery?

    my car Pc is only using about 40-45w

  2. #52
    Raw Wave
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    The big battery would work with this circuit, but its overkill just for crank survival. The one on the circuit diagram is only 0.8Ah...and a 2.8Ah battery should be more than enough to survive a crank for most PC.

    The limiting resistor needs to be recalculated to a lower value and a higher wattage otherwise your large battery will take forever to charge up. The diodes need looking in to as well, the one I stated above can only handle up to 3A. Getting a smaller battery is not that expensive, less hassle in installation.

    As I said before that circuit was designed for low powered equipment so you cant just use those components I listed. Its main function is surviving the crank and not for extending the PC running power...run your engine if you want this until you run out of fuel

    If you do want to use the second battery as an extra running power for your PC then another approach might be a better solutions.


    OPPS I missed your last sentence...

    You still need to upgrade your diode to handle more than 3A. A 5A diode should be OK for your application. Find a diode with the lowest voltage drop on the link I posted above

  3. #53
    Low Bitrate cotwild's Avatar
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    Quote Originally Posted by mst
    A few months ago I was nearly finished my setup for my "still under renovation" Golf GTI 1983 with a 16v engine with a laptop 266 Mhz, mainly for GPS,then I had the (mis)fortune to read about the Via Epia motherboards on the net and later I found the MP3car forum,it has been quite an expensive meeting,the laptop is dished,so is the car radio and it will take quiet a few months before the car is finished;but the carputer can do a lot more then an old laptop
    i can feel with you..
    i planed to use a 400Mhz IBM Thinkpad.. now i'll have to buy a 1Ghz VIA EPIA board!
    STATUS: planing / building
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  4. #54
    FLAC LESLIEx317537's Avatar
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    I'm going to try a mbr6045 diode. It's good 50amps and 800amps surge.

    Can I use a 5.1Ah Ni-Cd battery for this application? I got one from TheSpecialist that he's selling on eBay.

    Also will I need the resistor setup since I have a Ni-Cd battery or can I just use the 1 diode to make sure the current is always going one way?

    How will the car know when to stop charging the Ni-Cd? Can it overcharge it and leak?
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  5. #55
    Maximum Bitrate MikeHunt79's Avatar
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    Umm, you need to look into battery chemistry really... I think that lead acid cannot be overcharged but Ni-cad can, but I'm not sure... I'm sure google knows

    If I were you, I'd get a small lead acid battery.

  6. #56
    phc
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    Quote Originally Posted by MikeHunt79
    Umm, you need to look into battery chemistry really... I think that lead acid cannot be overcharged but Ni-cad can, but I'm not sure... I'm sure google knows

    If I were you, I'd get a small lead acid battery.
    Right, Lead acids can be charged at constant voltage, as long as the voltage does not go too high. For car batteries, its around 13.8 - 14V or so. For sealed lead acid, you also must limit the current, or they will bloat and possibly explode.

    For Ni-Cd or NiMH or Lithium ion, or Lithium polymer, you must be very careful to limit both the voltage and current.

    For this application, I recommend Hawker Sealed Lead Acid - with a 12 V pack, you don't need to limit the current and the max charge voltage is 15V. They make a 2.5V - 6V mono-bloc.

  7. #57
    FLAC LESLIEx317537's Avatar
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    OK, so I went to RadioShack and saw they had a 12 volt sealed lead acid 5Ah battery for 24 buks.

    Now how can I limit the current to be 1.5amps charge which the box states?

    Or should I get that Hawker SLA battery? How many amps does that charge at? Thanks. I am trying to get this tank built.
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  8. #58
    FLAC LESLIEx317537's Avatar
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    I just came up with a idea I think.

    I need to get a relay and learn how to hook it up. Also I need to make a diagram.
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  9. #59
    FLAC LESLIEx317537's Avatar
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    Forget about running the relay off the accesory line, casue when you crank most cars accesory drops out. - Thats why HU's sometimes go off and back on.

    Run the relay off the PC PS 12 volt molex. When you crank, no drop in that line casue the backup battery is connected to the main line whenever the relay sees the 12 volts on the PC PS Molex line.

    This way the crank survival should work for everyone. Easy to make one for people too. Just get a box, add a battery, put a diode in, and add a molex connector to hook up to the relay. Now we know everyones carpc's Molex is the same so during crank, they all should act the same tehrefor crank survival shoudl be the same for everyone. No matter what setup you have as long as your diode can handle the foward voltage.

    Now examine my setup, I wish I had a diagram, but tell me what's wrong? I think it shouold owrk for my Ni-Cd 5.1 amp bbatery since i got a 20 amp fuse on the line, the Ni-Cd will never try to charge at a rate greater than 20amps, which is a 4C charge rate. 4C charge rate is ok for a Ni-Cd. It won't blow it up. If the battery is fully drained out its 5100mAh, then the battery should take 15 mins to charge at a 4C rate. So I shouldn't need a resistor for a Ni-Cd setup correct? Oyeah, the Ni-Cd's won't blow up right, they will only leak air out of the vents the abttery makers installed on the back and front of the abtts. Right? Now, I don'e reccomend running Lithium Ions in the car, they like Dynamite, but I would run Lithium Polymers since they just marshemelow and puff up like stay puff.
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  10. #60
    FLAC LESLIEx317537's Avatar
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    Quote Originally Posted by phc
    For this application, I recommend Hawker Sealed Lead Acid - with a 12 V pack, you don't need to limit the current and the max charge voltage is 15V. They make a 2.5V - 6V mono-bloc.
    Did you mean you don't need to limit the voltage?
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    GPSing - Digital Speedo
    Relocating headunit and extending faceplate
    Button app to Alt-Tab between two programs

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