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Drained P85D Battery to 0.4%! success!

Discussion in 'Model S: Battery & Charging' started by wk057, Mar 15, 2015.

  1. wk057

    wk057 Senior Tinkerer

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    Just figured I'd share my latest adventure. Decided to head out and skip directly from my house to the South Hill, VA supercharger.

    Tesla's new in-dash estimator said I would arrive with -12%, Charging needed to reach destination. Pfffft...

    Set out with 100% charge.

    2015-03-15 12.30.14.jpg

    A few miles in I was already convincing it of the error of its ways...

    2015-03-15 12.31.23.jpg

    Less than 100 miles out I had finally convinced the car that the trip was possible!

    2015-03-15 12.32.59.jpg

    Scooted past the Burlington supercharger :)

    A little later I decided I had plenty of buffer for the rest of the trip and bumped cruise control to 78.

    About 5 miles from South Hill I finally gave in and dropped speed to 65 with 6 rated miles left.

    Hit the off ramp with 2 rated miles. Regen to the stop. Climbed the hill up towards the supercharger. 1 rated mile.

    Let off and pulled into the supercharger and regen got me back to 2 rated miles.

    Success.

    2015-03-15 12.33.32.jpg

    2015-03-15 12.34.07.jpg

    2015-03-15 12.34.30.jpg

    50% charge in 23 minutes. Left for Glen Allen...

    Fun stuff. Lowest I've every drained the pack on a Model S. Was confident the whole time, really. :)

    I've done this in my P85 previously, but was impossible with the P85D up until the latest updates.
     
  2. Matias

    Matias Active Member

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    You drove too slow :wink:
     
  3. bollar

    bollar Disgruntled Member

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    I would have laughed if your max charge was 60kW! ;)
     
  4. AnOutsider

    AnOutsider S532 # XS27

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    Pretty impressive (and ballsy)!
     
  5. wk057

    wk057 Senior Tinkerer

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    lol. Nope, hit 118kW at South Hill. At Glen Allen now and hit 120kW here on 3B.
     
  6. muleferg

    muleferg Member

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    Never done that in an S or Leaf. I did that with my GEM car. It had a 25 mi range. I did stretch it one day, and it wouldn't go up a hill on the way home. I always had a small portable Gen with me. I still wasn't weaned off gas. Glad you made it. Hey I'm 82 years old and never pass up a bathroom or Super Charger.

    West Wilkes EV Team on the way to Garysburg, NC
    6770675_orig.jpg
     
  7. mhpr262

    mhpr262 Member

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    Close shave! Not ideal for the battery though, getting drained real deeply is what Li batteries like least.
     
  8. EarlyAdopter

    EarlyAdopter Active Member

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    It's a chemical reaction, so time and temperature matter. He was only drained for a very short period of time at a cool 59F. I'd say very little risk of any degradation at all under those conditions.
     
  9. mkjayakumar

    mkjayakumar Active Member

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    Only 75kWh usable on a 85?
     
  10. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    You missed the best part... everyone needs a picture of "Charge Now" in the speedo display.
     
  11. fadkar

    fadkar Member

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    That's impressive! I know that it's going to take me some time before pulling off stunts like that!

    - - - Updated - - -

    Yup. I've heard that only 75kW is available out of the 85.
     
  12. Fezzik

    Fezzik P67429

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    Awesome. Can you give a little more on the details of your trip? Total miles from beginning and velocity throughout your trip?
     
  13. kennybobby

    kennybobby Member

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    i like the irony in your choice of music leading up to the end...that shows confidence indeed.
     
  14. billarnett

    billarnett Member

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    There's another thread here somewhere that says that there is about 5 kWh of "below zero" buffer that you can in fact use, though it's obviously risky. Several folks have reported that they've driven 10 or 15 miles past zero. And there's another approximately 5 kWh of buffer below that that is used to prevent the battery from totally bricking itself.
     
  15. svp6

    svp6 Member

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    And many other threads with people getting stranded when the car hits 0 miles - would not count on the buffer. That being said, the trip prediction becomes very accurate after first 20-30 miles or so, and gives a lot of confidence in how far you can push it. Nicely done
     
  16. andrewket

    andrewket 2014 S P85DL, 2016 X P90DL (soon 100)

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    Nice job. You have to love the 0-50% charge rate.
     
  17. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    There was a recent case where someone I know had their Model S shut down with ~10 mi. rated range left. I'm sure they looked closely at that case.
     
  18. Fezzik

    Fezzik P67429

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    This would def tick me off. 10 miles is a lot to rely on and it not being there.
     
  19. wk057

    wk057 Senior Tinkerer

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    lol. Did 65-70 for the first ~100 miles, then ~78, TACC permitting, the rest of the way.

    Well, considering how the software is setup to operate inside an interior SoC window, it technically wan't deeply discharged. That said, even if it was, doing so then immediately recharging while at a reasonable temp should have little to no effect on the pack.

    Yep, about right. See above (and numerous other posts on the topic)

    Honestly... I was a hair disappointed to have missed out :(

    This part of my trip was from my home in Hickory, NC to the South Hill, VA supercharger, 228.9 miles. 99% interstate highway with minimal traffic. 65-70 MPH the first ~100 miles, then 78 MPH (with a few slowdowns due to traffic to 60-70 range) right up to a couple of miles before the supercharger exit's off ramp.

    I thought that was great, myself, and wasn't intentional :) Just a Slacker station :p
     
  20. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    He was given a free tow for the final few miles and as I understand, they were analyzing the data to figure out why it happened that way.
     

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