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Thread: How long will it last?

  1. #1
    Newbie
    Join Date
    Nov 1999
    Posts
    2

    How long will it last?

    Hello, I have no clue about electrical stuff and I'm new the Mp3 Car so here's my situation. I have an old computer, P233 with a 250W power supply. If I stuck that computer into my truck...

    1) How long would my battery last if I were idle?
    2) Is there any other way to give power to my motherboard, other than the 250W power supply?

    Sorry for the incompetance.

  2. #2
    Low Bitrate
    Join Date
    Sep 1999
    Location
    Australia
    Posts
    99
    Depending on how you go about powering your system, your battery should last quite a while, I have built a DC-DC power supply for my box and the max current draw is around 2.6 Amps (nothing to worry about realy). You have two options for powering your box, they are.... buy an inverter (this is the easiest) or build a DC-DC Power Supply (take a look at some sites like http://www.jarcom.com/inmotion/ ). You can also buy them pre-made, check out some of the older topics in the discussion board. Everything you need to know should be real easy to find and this is a good place to start.

  3. #3
    Constant Bitrate
    Join Date
    Jul 1999
    Location
    Decorah, IA, USA
    Posts
    196
    Unless you're drawing an inordinate amount of power, your battery should last as long as your gas does while you're idling. Correct me if I'm wrong, but as long as the engine is running, there's really no drain on the battery.

  4. #4
    Newbie
    Join Date
    Nov 1999
    Posts
    2
    Thanks for the help.

  5. #5
    Variable Bitrate
    Join Date
    Aug 1999
    Location
    Yorba Linda, CA
    Posts
    323
    Correct.

    The alternator provides all the power when the engine is running, and the battery acts like a large capacitor which is charged by the alternator and used for cranking and powering other devices when the engine is off. The battery also acts like a capacitor in that it helps smooth ripple coming from the alternator.

    It's a strange way of looking at it actually, but it's true when you think about it.

    FYI: I've heard of some people reworking an alternator to provide 110VAC by removing the diodes & internal regulator and rewinding the coils inside! They installed it in addition to their 12V alternator and used it to power 110VAC devices...

    --Jason
    http://jump.to/m2pc
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

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