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Thread: Quick Question

  1. #1
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    Quick Question

    Alright this is a specific question so i doubt it will be out there anywhere else

    If i pick up a M4-ATX 250 watt dc-dc regulator with my 185 watt PC how long do you think i will be able to run the PC with the car off.

    Right now im using a 500 inverter and i only get about 10-15 minutes max before the low power alarm goes off on the inverter.


  2. #2
    Maximum Bitrate bratnetwork's Avatar
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    this question cannot be answered with the information provided. Inverters all different and have different effeciency levels but that is still irrelevant.

    basically it all just comes down to the capacity of the battery. since there is no mention of a battery type and amp-hour rating. also a factor is what peripherals of your pc run off the PSU and what will run right off the battery.

  3. #3
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    I apologize, i am very new and am trying to learn the best i can. the reserve capacity of the battery is 110 its a duralast battery.

    Cold Cranking Amperage at 0F: 650
    BCI Group: 41
    Jumpstart Protection: No
    Cranking Amps: 810
    Reserve Capacity: 110

    The PC is running a cd drive a hard drive a gps dongle and the motherboard.

    Thanks for your help.

    Im just looking for a ballpark really.. like "You should expect to see about a 100% on time" (aka 30 minutes instead of 15)

  4. #4
    MySQL Error soundman98's Avatar
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    At what voltage does the low power alarm go on, on the invertor?

    my setup(screen is powered by car power)-- dsatx, intel 945, 2.5 laptopdrive, usb soundcard, usb dvd-r/w, usb gps. i also have a liliput 629, a alpine 300x4 amp, and a sony 300x2 amp, and a radar detector with battery guage, all of which gets powered on with the car computer, but from different circuits, but are still drawing from my battery-my battery is a optima yellow top. the voltage in my setup has never gone below 12.0 volts(i have setup my dsatx for the lowest shutt off voltage-- something like 10 volts), after running whole the setup for about 2-3 hours.

  5. #5
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    Its suppossed to warn when the voltage drops below 10.5 volts... i did confirm that its dropping with a volt meter

  6. #6
    MySQL Error soundman98's Avatar
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    do your have the entire car turned on(exept for the engine)? this could also lead to excessive battery draw. i usually just turn on the acc circuit.

  7. #7
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    It's just on the accessory and I'm only running my radio and pc... No subs

  8. #8
    MySQL Error soundman98's Avatar
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    i would estimate that you should be able to get at least a hour run time off of a dc-dc power supply, but there are so many factors to it, that it will be hard to predict reliably.

  9. #9
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    Thanks for your help

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