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Thread: Wattage Calculator

  1. #1
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    Wattage Calculator

    I've seen different threads trying to calculate wattage for systems and I remember this site.

    http://www.jscustompcs.com/power_supply/

    Great site, but it's a tad limited when it comes to powering stuff like LCDs and other carputer stuff.
    Good generalizer though.

  2. #2
    Maximum Bitrate deadweasel's Avatar
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    HOLY CRAP! Thank you! I've been needing something like this! Now I know for sure that my rig will work with my DC/AC inverter (and that OPUS would die like a diseased skunk on a busy freeway).
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  3. #3
    Low Bitrate aultl's Avatar
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    I have always used this power calculator, of course it is only for EPIA mobo's...
    http://www.mini-box.com/powersimulator.html
    Aultl
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  4. #4
    Newbie djjazzman's Avatar
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    This use to be a sticky awhile back. I have been using it for a general idea. I am getting a big difference between the two. The jc site says 200 i know that is everything running at max all at once. The other gives me 88 hummmm guess I can't get by with the 70a now.
    http://www.mymp3car.com/MP3Car/PSUpower.asp

  5. #5
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    DJ, wow! Nice calculator. I never came across that calculator. I remember searching for a couple days for a wattage calc before I even found the JS one. I know the JS one is a bit extreme but I think they do that for margin of error/boosting sales for bigger PSU (note that they are system builders). Plus, if you look at the code, about 1/3 of the way down they have this line:
    objForm.total.value = parseInt(intTotal*1.3) + 36;
    It's the string to total the wattages, but why multiply by 1.3? Any ideas on this?

  6. #6
    Raw Wave
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    It's the string to total the wattages, but why multiply by 1.3? Any ideas on this?

    For margin mainly.

    For example a HDD or DVD rom spinning up needs alot of current, then after they stablise to the normal consumptions. Infact device do need larger current at initial switch on. A bit like accelerating a car thats when you used up alot of fuel after a steady speed is reached fuel consumption goes low.

    The high margin just ensure that the PSU built-in current limiter never get tripped otherwise a complete PSU shutdown may occur.

  7. #7
    Maximum Bitrate owenjh's Avatar
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    I do not think that calculator is correct. I will see when I get my system up and running
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  8. #8
    Maximum Bitrate jusatry's Avatar
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    Question

    Quote Originally Posted by aultl
    I have always used this power calculator, of course it is only for EPIA mobo's...
    http://www.mini-box.com/powersimulator.html

    has anybody had any problems with this calculator?

    when using it is it usually short or long of the "actual number"?

    TIA

  9. #9
    Maximum Bitrate Altimat's Avatar
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    It would be nice if we could get a sticky of DCDC setups, and actual current draws while the systems are in heavy use.

    Anybody see a problem with using an Opus (powering Mobo, internal devices, HDD) and a relay to turn on a PW-70A, and then use the PW-70A to power all of the external hardware and optical drives?
    Fabricator

  10. #10
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    Quote Originally Posted by Altimat
    It would be nice if we could get a sticky of DCDC setups, and actual current draws while the systems are in heavy use.

    Anybody see a problem with using an Opus (powering Mobo, internal devices, HDD) and a relay to turn on a PW-70A, and then use the PW-70A to power all of the external hardware and optical drives?
    that crazy enough to work. I know I decided to stop calculating on the jsc calculator when i was at 251w. I guess i'll just order the opus150 from here and pray.
    AMD 1800+ XP
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    will it handle all that?

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