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Thread: do i really need 500w?

  1. #1
    Newbie Aetta's Avatar
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    do i really need 500w?

    I am just finishing my project car...
    I'm running an ABIT motherboard w/ amd 1.6ghz,
    80gb maxtor, 512mb ,nvidia video card, it has internal nvidia audio. I have a 15 ferret cap powering a 500x1 zapco and a 360x4 zapco amp, and the lilliput 7" tft touchscreen.
    my question is, Im almost done with everything, but it seems i fried the inverter I had (330w). I am now running a 400w atx power supply to the computer itself, do i really need a 500w inverter to reliably run the computer? or was it just a fluky inverter that I had?

  2. #2
    Variable Bitrate
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    The inverter needs to be a little bigger than the load. For example, if you PSU needs 400watts RMS, then you need bigger than a 400watt RMS inverter, to be safe.

    However, it may be that the 400watts rating of your PSU is peak, not RMS, which then, your inverter would be ok being bigger than 400watts peak (200 watts RMS).

    If you don't know, then you can always search, or err on the safe side and use the bigger inverter.

    All that said, just because you have a 400watt PSU doesn't mean anywhere near 400watts is being used; that is just the max it can output. Is the inverter 330 watts RMS or Peak? If the 330watt inverter was 330watts RMS, then it should not have fried unless it's fan went bad or there was some other problem, as the PC you described isn't likely going to pull 330watts RMS.

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  3. #3
    Variable Bitrate RS3RS's Avatar
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    Just keep in mind that a 400 watt power supply does not mean that it pulls 400 watts of power. That's just the max rating that it can possibly pull, and unless it is a brand name power supply, chances are it can't even put out that much power anyway.

    Also, I have a 2.4 ghZ processor, one stick of ram, desktop hard drive, desktop DVD drive and my Lilliput running off of a 200 watt OPUS with no problems, so I doubt your system is pulling that much power. I say your inverter was probably just lame.

  4. #4
    Maximum Bitrate hd54321's Avatar
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    Quote Originally Posted by RS3RS
    Just keep in mind that a 400 watt power supply does not mean that it pulls 400 watts of power. That's just the max rating that it can possibly pull, and unless it is a brand name power supply, chances are it can't even put out that much power anyway.

    Also, I have a 2.4 ghZ processor, one stick of ram, desktop hard drive, desktop DVD drive and my Lilliput running off of a 200 watt OPUS with no problems, so I doubt your system is pulling that much power. I say your inverter was probably just lame.
    200watt OPUS?

  5. #5
    Maximum Bitrate Vchat20's Avatar
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    ^what he said.
    Your everyday carpc geek and tech guru at your service. *bow*

  6. #6
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    200 watt opus, WHERE! lemesee.........

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