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Thread: Stay alive while cranking

  1. #1
    Join Date
    Jan 2004

    Stay alive while cranking

    There is a lot of discussion over "tank" circuits and other ways to keep your car-pc alive while cranking

    When testing my computer system i hooked the invertor directly to the battery, without using a relay or anything, i noticed the computer stayed alive whilst cranking

    The current setup has a relay, controlled by the ACC+ line to trigger it. As the car cuts out the ACC while cranking, the invertor shuts off, killing the computer power.

    As the invertor survived the "crank" when i tested it, the cutout isn't because of the voltage draw of the starter.

    Logically couldn't i put a smallish capacitor on the ACC+ line (used as the relay trigger) to keep voltage supplied to the relay whilst cranking? Would this work? would there be any possible harm to anything if it tested this?

  2. #2
    Constant Bitrate P4_2.66GHz's Avatar
    Join Date
    Feb 2004
    You'll need to isolate capacitor used and the relay by a diode. Otherwise, the capacitor will get discharged by the rest of the electrical system.
    Capacitor, however, will need to have big capacity to hold the relay for long. I'd say try 4,700 uf.

    You're not likely to hurt anything, if wired correctly.

  3. #3
    Maximum Bitrate sfay93's Avatar
    Join Date
    Feb 2004
    Omaha, NE
    Or, you could just hook it directly to one of the ignition wires. They maintain 12V through the crank.

  4. #4
    MySQL Error MatrixPC's Avatar
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  5. #5
    Join Date
    Jan 2004
    yeah, i've already looked at that thread, but it's alot less hassel if i can use a cap, as i won't have to run another wire to the back of the car, and wont have to unscrew half the dash to get to the wire.

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