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Yellow dotted line on power meter

Discussion in 'Model S: Battery & Charging' started by cinergi, Nov 14, 2012.

  1. cinergi

    cinergi Active Member

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    Behavior when getting low on range

    The lowest I've gone now is 20 miles left. The battery goes yellow around 30 and power is limited. I know others have had less. Would love to document what happens as you get to 0 ... can you keep driving all the way to 0? Past 0? Does power get limited even more as you get closer to 0? Details / pics please! Here's one to start:

    photo 1 (1).JPG
     
  2. brianman

    brianman Burrito Founder

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    I often try to be accomodating on research stuff, but I'm aiming to keep my battery above 10 miles projected for at least the next year or two.
     
  3. DaveVa

    DaveVa Sig Perf #236 VIN #484

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    I got down to 5 miles with the same limits showing in your picture. It did not limit further at that range.
     
  4. stevezzzz

    stevezzzz R;SigS;P85D;SigX

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    When do those white arcs appear on the speedo and power meter?
     
  5. cinergi

    cinergi Active Member

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    The only thing unusual in those pics is the yellow dotted line near the 160kW power mark. That appeared with around 30 miles left.
     
  6. dflye

    dflye S Sig Perf 414, VIN 814

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    Coming back from a test road trip last night to visit B.I.L. where I got about 220 miles out of a range charge (mostly freeway driving and not too light on the pedal), the power limiting came on around 30 miles with the line at 320kW and gradually went down to the 160kW line.

    Ran it down to a theoretical 2 miles in the neighborhood, and was surprised that it didn't limit power consumption further at such a low range, and had NO warnings other than the range indicator going from yellow to red at around 5 miles or less.

    Was expecting some audio or more visible cue that I was about to be stranded on the side of the road. :scared:
     
  7. stevezzzz

    stevezzzz R;SigS;P85D;SigX

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    Really? Mine are solid bars: no white arcs. A Performance/non-Performance difference? Or did those white arcs appear when you reached a certain range remaining number?

    image.jpg
     
  8. sublimaze1

    sublimaze1 8Dec2012 / Leeroy Jenkins

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    Maybe Firmware?
     
  9. donauker

    donauker Member

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    Based on the rest to the photo, it looks like significant overexposure due to the dark background.
     
  10. NigelM

    NigelM Recovering Member

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    That's the "power limited" indicator.
     
  11. brianman

    brianman Burrito Founder

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    Except for the projected (2400!) and the cruise on (haven't used it yet), steve's pic looks familiar.
     
  12. dflye

    dflye S Sig Perf 414, VIN 814

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    More likely a high-contrast photo shot in low-light, exif data says with an iPhone... judging by the washed out colors on the headlight indicators and general image blur, I think the bars were the normal blue/green, just too bright for the phone's camera to properly capture.
     
  13. mknox

    mknox Well-Known Member

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    Curious to know if the power is limited by design, or does it have something to do with the battery getting low (i.e. like a flashlight getting dim as the batteries wear out). I'm pretty sure it's the former and, if so, how much of an impact does this have on driving performance?
     
  14. stevezzzz

    stevezzzz R;SigS;P85D;SigX

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    @Brianman: the 2400 Projected range number came at the end of a long, shallow descent from 9000' to 5000'.

    @dflye: I don't think that's it: notice how in my photo the brightness of the speedo and power meter color bars is graduated from the zero point. There's no sign of that gradation in the first photo where the arcs in question show as bright white, right from the zero point.
     
  15. cinergi

    cinergi Active Member

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    If it's this area we're talking about, it's definitely over-exposure.

    whitearc.png
     
  16. Vger

    Vger Active Member

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    It looks like they do the same thing as the Roadster, limiting power by 50%. Essentially, it take the car from neck-snappingly-quick down to still-pretty-quick. You can still merge safely and pull away from stop lights reasonably, but it keeps you from sucking a huge chunk of your tiny remaining SOC budget by getting frisky, when you need to be just focused on hypermiling to that next EVSE. :wink:
     
  17. strider

    strider Active Member

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    It's also to protect the batteries since internal resistance goes up as the SOC goes down. Rapid acceleration requires quicker discharge which when coupled w/ low SOC means more heat.
     
  18. Francis Lau

    Francis Lau P-1456

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    Can someone explain what these 2 yellow lines are?

    Can someone explain what these 2 yellow lines are?

    Gauge with 2 yellow lines-web.jpg

    I know that B is to show regen is limited but how do you read it? I saw A for the first time this morning.
     
  19. brianman

    brianman Burrito Founder

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    A - Limit consumption.
    B - Limit regen.

    Both triggered by weather conditions (too cold). B usually slides to around 40 kW, and then vanishes, as the car (battery) warms up.

    With the temperature in the 40s (F) outside, I've been seeing B daily for a week or two now. Within 5 miles, it disappears.
    I've only seen A once.

    There's a "C" that shows up for speed when your SOC/range gets low. At least I think that's why. I've only seen it once, when my Projected (pre 4.0) range was < 10mi.
     
  20. Francis Lau

    Francis Lau P-1456

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    Thanks. You drove yours down to 10 miles?
     

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