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Thread: Any Mac experts on PMU?

  1. #21
    FLAC sdashiki's Avatar
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    well. ive been put in my place havent i.
    fine no second batteries for you. not my problem is it.
    (0.0%-) starting over
    iPad 3G 64GB, RF 600.5 amp, JL10W0V2, 8 Infinity Components

  2. #22
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    Smile

    i talked to the guy at the other end of www.mp3car.com he said in a month or 2 there will be a released mac mini automotive power supple
    so call him and get the info...

  3. #23
    Admin. Linux loser.
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    Bugbyte's Avatar
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    Welcome to the forum Joey. Post 19 is from one of the owners of the company that will be making the power supply.
    Quote Originally Posted by ghettocruzer View Post
    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

  4. #24
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    what about useing a Capacitor and or 2 altnator's and upgrading to a good battery Yellow Top Optima Model D34/78-950 12V Deep Cycle Battery
    with a cap you can maintain 14v i have 1 in my car allready for my amps good stuff...

    ohh ya im a certified mac tech
    did tech support for apple computers for 2 yrs..

    http://caraudiomag.com/technical/0206cae_alternator/

    Quote Originally Posted by MikeH
    Ph75,

    Thanks for the input. However, the problem we are facing is not so much "switcing" power (ie relays) as it is "conserving" power. What we are trying to do is minimize, as much as possible, the power demand of the Mac during its sleep time. Previously we thought that we could use the car battery to directly provide +12V to the mac while it slept. However, we have found out that +12V does not seem to work reliably. Now we are back to letting the P1900 provide the power (+18.5V) to the mac during sleep. This seems to work 100% of the time but consumes more power than the direct battery connection. As it turns out, this may not be a problem if your battery is in relatively good shape. I have been experimenting with this for the past 2 days and the load (~200mA) does not seem to discharge the battery significantly, especially if you use the car regularly (ie start the engine and let the battery recharge to its full potential). The real question (yet to be answered) is just how many days can you draw 200mA from your battery without damaging it.

    As other members have suggested, a secondary battery fed by a battery isolator might be a good solution, however others don't have room in their car, or don't want to spend and extra ~$100 on this solution. So what we hope to do is find a lowest cost solution that provides the best possible performance (starting to sound like a big corporation now....

    Anyway, sorry for the rambling. Thanks for the input.

  5. #25
    Admin. Linux loser.
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    Bugbyte's Avatar
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    I believe the Mini requires 18 volts. But the wait is over. MP3car.com store has the power supply in stock now.
    Quote Originally Posted by ghettocruzer View Post
    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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