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Thread: pc using a lot of power in hibernation?

  1. #1
    Variable Bitrate
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    pc using a lot of power in hibernation?

    Hi,

    I have a problem that started last week...

    when i put my pc in hibernation, it's eating a lot of power..
    when i shut down my car and hibernate my system, i measured the volts on my battery: 12.81.
    aproximatly every 2 seconds that lowered with 0.01 volt...
    is this normal? my car had a dead battery this morning, and i think that is the problem...
    any idea why i have this problem? it used to work fine before...

    Greetz

    Dj NRG

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Your PC shouldn't be drawing ANY power when hibernating. The PC writes all the contents fo RAM to a file on the hard drive and shuts off.

    Are you possibly referring to standby mode? That's where the PC writes system state to RAM. That will draw power, as the PC requires the RAM to be powered to maintain the system state.

    Where is it drawing the voltage? Is that between the PSU and the battery or between the PC and the PSU? Also, is it on the ACC line or on the 12v hot?
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
    Variable Bitrate
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    I was idd reffering to standby... sorry for that.
    for now i'm only sure it draws power from my battery... shutting down the pc completely and pulling out the fuse helpt for that. will test this afternoon where it exactly draws power. what do you mean with the acc? that's my remote for my psu, right?
    what does a pc normally use when put in standby?

    Greetz

    Dj NRG

  4. #4
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    Why not check you DC-DC Regulator? Maybe it has some problem!

  5. #5
    Neither darque nor pervert DarquePervert's Avatar
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    A PC will draw power while in standby. Power is required to keep the system state stored in RAM. That's how standby works.

    A PS will not draw power in hibernate. System state is stored to a file on the hard drive and powered down.

    Now, Standby is, by far, the fastest method of shut down and/or startup, but you pay the penalty of the power draw. Normally, PC standby shouldn't draw enough to drain your battery overnight.

    Is the PSU shutting down 5v USB devices?

    Could there be anything that's happening that might bring the PC out of standby like Wake on LAN (if it can connect to a WiFi network, for example)?

    If there's nothing that you can determine that could be causing the increased load, then the battery could be incapable of holding a full or near-full charge.
    You could also have an alternator that doesn't put out enough to keep the battery charged.
    You may also not drive enough to fully charge the battery. If you only drove a couple miles to work each day, this could be the case.

    To help troubleshoot, wiring diagrams and specs would be helpful.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  6. #6
    Variable Bitrate
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    Hi, allready thx for the answers.

    wiring diagram is here
    the problem seems to be solved today... will check my battery later today.
    alternator is only 3 months old (110Ah, the old one was only 70Ah) and my battery is also only 3 months, so i doubt that wass be the problem...
    anyway, my usb devices stay powered, but i do not think they draw a lot of power... (steering wheel controls are not powered via the pc, radio is not connected at this time, touch screen is shut down)

    If the problem comes back I'll let you know...

    Greetz

    Dj NRG

  7. #7
    Newbie Fuse's Avatar
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    Quote Originally Posted by Dj-[NRG] View Post
    Hi,
    when i put my pc in hibernation, it's eating a lot of power..
    when i shut down my car and hibernate my system, i measured the volts on my battery: 12.81.
    aproximatly every 2 seconds that lowered with 0.01 volt...
    is this normal? my car had a dead battery this morning, and i think that is the problem...
    Dj NRG
    To see if the PC, or anything else, is using power you need to check for current flowing out of the battery, not the battery voltage.
    Fuse - From the land of Oz

  8. #8
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    ^^^ he's right, you need to check the amperage draw of the system while off-standby... this is a much more relible indicator of what your dealing with, voltage drop-time isn't very useful in calculating anything really..

  9. #9
    Constant Bitrate ZtH01's Avatar
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    Quote Originally Posted by Dj-[NRG] View Post
    Hi, allready thx for the answers.

    wiring diagram is here
    the problem seems to be solved today... will check my battery later today.
    alternator is only 3 months old (110Ah, the old one was only 70Ah) and my battery is also only 3 months, so i doubt that wass be the problem...
    anyway, my usb devices stay powered, but i do not think they draw a lot of power... (steering wheel controls are not powered via the pc, radio is not connected at this time, touch screen is shut down)

    If the problem comes back I'll let you know...

    Greetz

    Dj NRG
    Alternators are not rated in Ah, it's straight amps. Anyways, rewound alts typically put out LESS power at lower speeds. Most cars require a smaller pulley, and thus a shorter belt to make enough power to charge the battery at idle. It may be a combination of the rewound alt not putting out enough power, and, assuming you live some were cold, the cold weather effecting the battery. Or perhaps the alt just plain isn't getting a chance to charge the battery. Or, the alt could be defective. My previous alt last a whole 6 months, it was only putting out like 30A at idle, so the battery would never fully chage... Could be a bad battery too, or both.

    Bad batteries tend to kill alternators, and bad alternators tend to kill batteries. It's a viscious cycle. Get em tested, most parts stores will do it for free.
    -ZtH01
    "It's my belief that my big balls should be held every night"

  10. #10
    Variable Bitrate
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    I'm sure it's not a problem with my battery or alternator (got the fuse out and all the problems were solved)...
    anyway, will not use my pc for a while, since my screen died...
    have to send it back to hongkong, so that will take a couple of weeks probably...

    Greetz

    Dj NRG

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