Page 2 of 68 FirstFirst 1234561252 ... LastLast
Results 11 to 20 of 673

Thread: Power drain while idle (Vampire Load)

  1. #11
    Model S 03182 ElSupreme's Avatar
    Join Date
    Jan 2012
    Location
    Atlanta, GA
    Posts
    4,275
    On a related note I finally got my home desktop to sleep properly. I am now saving about $15 a month in power (probably only about $10 since I turned off my AC)! So yes these things do consume real amounts of power.

    Think with dispassion; Speak with equanimity; Act in calm.
    Moderator - Southeast, Future Cars, TMC Connect, Off Topic
    Do not use this material outside of Tesla Motors Club without attribution and permission.

  2. #12
    Member
    Join Date
    Aug 2012
    Location
    Cambridge, UK
    Posts
    439
    Quote Originally Posted by Doug_G View Post
    Most microprocessors have low-power idle modes, sometimes various alternative modes, where the processor goes to sleep until an interrupt occurs. If they can put processors to sleep this way then they can have very low-power idle and instant wake-up. They might have to do some firmware magic to get it to work, but that's a "simple matter of software" (quotes are for irony purposes). That's what "sleep" mode is on your notebook computer.
    Yes, but this doesn't really match up with the loads people are reporting - even if left fully running, these CPUs would only be a couple of watts, yet people are reporting figures like 500W. We know that the two 'big' processors running the instrument display and touchscreen are Nvidia Tegra (as used in tablets) which have idle power management in normal operation. Those are probably the only processors in the car running a heavyweight OS that would need significant reboot time.

    So, it could be something mechanical causing these loads (someone upthread mentioned brake servos, also there's battery cooling), or it's death by a thousand cuts in all of the minor subsystems contributing the odd watt here and there and just adding up to a big total. It may be a long slog to fix it rather than a single big win.

  3. #13
    Member Ceilidh's Avatar
    Join Date
    Oct 2012
    Location
    Los Altos (Silicon Valley), CA
    Posts
    337
    Seems to me that Tesla could make this user-selectable. Clearly the instant on capability is there is your are less energy / cost conscious. Would be nice to have an eco-mode for this that turns the car off unless the battery temp needs to be adjusted, but otherwise turns on when the door is opened or when the driver sits down or something. Shouldn't be too hard to program given that the sensors are already in place and such.

  4. #14
    Burrito Founder brianman's Avatar
    Join Date
    Nov 2011
    Location
    TMC.com
    Posts
    12,547
    Quote Originally Posted by Ceilidh View Post
    Seems to me that Tesla could make this user-selectable. Clearly the instant on capability is there is your are less energy / cost conscious. Would be nice to have an eco-mode for this that turns the car off unless the battery temp needs to be adjusted, but otherwise turns on when the door is opened or when the driver sits down or something. Shouldn't be too hard to program given that the sensors are already in place and such.
    Maybe they should hae some kind of, well, "Storage Mode"...
    Truly Electric Spaceship-Like Adventure ~ Signature Model Spaceship

    PLEASE NOTE: these musings are the copyrighted intellectual property of the author, and are intended as part of a conversation among the Tesla Motors Clubs membership. My words may not be quoted by any third party outside the Tesla Motors Clubs forums, without my expressed consent. Especially the NYT, which is clearly ethically challenged.

  5. #15
    BLUTSLA #516-REDTSLA #272 DrComputer's Avatar
    Join Date
    Jan 2009
    Location
    Sherman Oaks, CA
    Posts
    793
    Blog Entries
    1
    I also think people have taken the "lost 10 miles in 24 hrs" number at face value. The S, just like the Roadster does not always show accurate mileage estimates after charging. It takes some time for the battery pack to settle and balance itself after charging. I think the actual loss is probably closer to 1 mile per day than 10.
    ____________________________
    2010 Tesla Roadster #516
    2012 Model S Signature Performance #272
    6kW Solar System by REC Solar with TigoEnergy optimization and monitoring


  6. #16
    S VIN S1049, X Resv S744
    Join Date
    Jun 2012
    Location
    near STL
    Posts
    3,395
    Quote Originally Posted by DrComputer View Post
    I also think people have taken the "lost 10 miles in 24 hrs" number at face value. The S, just like the Roadster does not always show accurate mileage estimates after charging. It takes some time for the battery pack to settle and balance itself after charging. I think the actual loss is probably closer to 1 mile per day than 10.
    Let's hope so. I live 60 miles from the airport and I take business trips that average 10-14 days long. I'd hate to come back from my trip and find that I don't have enough miles to get back home.

    Of course, I've found a couple of airport parking facilities that will let me have a NEMA 5-15 while I'm parked there, so I think I've mitigated that concern -- but if they're occupied or busy, I might have to bank on my miles still staying up there.

  7. #17
    Dr. EVS rolosrevenge's Avatar
    Join Date
    Feb 2009
    Location
    Redmond
    Posts
    1,447
    Quote Originally Posted by pilotSteve View Post
    +1 Tommy, Doug_G: I was surprised at the $14/month cost. Did the math myself and I agree with your numbers. My power in the Pacific Northwest is cheaper at 0.09/kWh but still its $8 per month. Whoa, yes I also hope this is remedied.

    Its like running 500W electric 'space heater' in your garage 6 hours every day! (3000/500=6). Atsa lotsa watsa!
    Unless, of course, you would have been running that space heater anyways (it's cold up here), then it is costing you nothing.

  8. #18
    Senior Member vfx's Avatar
    Join Date
    Aug 2006
    Location
    CA CA
    Posts
    14,794
    Quote Originally Posted by Doug_G View Post
    ...Mind you, the Model S has flash memory, not disks, and there may not be enough storage to do that.....
    Maybe this type of software upgrade is why they have not opened the memory to owners yet.

  9. #19
    Roadster#433, Model S#S37 Cottonwood's Avatar
    Join Date
    Feb 2009
    Location
    Colorado
    Posts
    3,105
    Quote Originally Posted by DrComputer View Post
    I also think people have taken the "lost 10 miles in 24 hrs" number at face value. The S, just like the Roadster does not always show accurate mileage estimates after charging. It takes some time for the battery pack to settle and balance itself after charging. I think the actual loss is probably closer to 1 mile per day than 10.
    That is exactly what I have seen. There is a big drop the first day after charging, then a much slower drop on succeeding days. Am I the only Model S owner that has gone multiple days without driving it?

  10. #20
    Roadster #1144 + Sig 114 dsm363's Avatar
    Join Date
    May 2009
    Location
    Reno, NV
    Posts
    13,779
    Quote Originally Posted by FlasherZ View Post
    Let's hope so. I live 60 miles from the airport and I take business trips that average 10-14 days long. I'd hate to come back from my trip and find that I don't have enough miles to get back home.

    Of course, I've found a couple of airport parking facilities that will let me have a NEMA 5-15 while I'm parked there, so I think I've mitigated that concern -- but if they're occupied or busy, I might have to bank on my miles still staying up there.
    I think you'll be fine even without charging but of course if you have it, take advantage of it at the airport.
    Moderator - Model S, Mountain/Southwest, Texas, Northwest, Off Topic forums
    PLEASE NOTE: Posts are the copyrighted intellectual property of the author, and are intended as part of a conversation within this forum. My words may NOT be quoted outside this forum, without my expressed consent.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Traction Battery, 12 volt battery and Vampire Load... How does this work??
    By lolachampcar in forum Model S: Battery & Charging
    Replies: 22
    Last Post: 2013-03-27, 03:30 PM
  2. Model S Daily Idle Battery Discharge Rates
    By Brad in forum Model S: Battery & Charging
    Replies: 1
    Last Post: 2013-01-21, 01:17 PM
  3. How far can you drain the battery before damaging it?
    By fiksegts in forum Model S: Battery & Charging
    Replies: 3
    Last Post: 2013-01-09, 08:20 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •