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Expected rate of charge chart for supercharging?

Discussion in 'Model X: Battery & Charging' started by Racerx22b, Aug 11, 2017.

  1. Racerx22b

    Racerx22b Member

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    I don't think I am getting the fastest rate of charge on my MX P100D and wondered if someone has done some extensive documentation of this. See attached. I feel like I could be getting higher kW with almost 100 miles of charging range left to go. I was the only car present so there was no sharing. This was at the FL Turnpike Yeehaw Junction Charger.

    I'd like to know what kW I should expect when plugging in at a given amount of range left until back up to 90% before I raise the issue to service to look into.

    I tried a search of the forum but I am not seeing what I am looking for. If anyone has a link or something else as reference I'd appreciate it.

    Jason

    IMG_5357.PNG
     
  2. outie

    outie Active Member

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    Superchargers are often degraded. Did you try another spot? Last time I charged at San Diego the rate was barely hitting 40kW the whole time, even without pairing. Ideally it should be over 100kW like I got at another Supercharger.

    Honestly the Supercharging network is overrated. Based on my limited experience (3 times) I would avoid them if I could. Too much time wasted because a 30min wait (as Tesla marketed it) turned out to be over an hour.
     
  3. Rossy

    Rossy Supporting Member

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    BJorn Nyland has a YouTube video with some graphs.
     
  4. Racerx22b

    Racerx22b Member

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    Yes. I changed from 3B to 1A. I was the only one there.
     
  5. Racerx22b

    Racerx22b Member

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    Perfect. Looks like I should be over 100kW up until about 50% charge.
     
  6. idoco

    idoco Member

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    Take a look at this spreadsheet. The person who created it extrapolated Bjorn's data along with other data.

    Supercharge Time Calculator
     
    • Like x 1
  7. electracity

    electracity Active Member

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    I think Tesla sometimes reduces charge speed due to how commercial electricity is usually priced (peak rate is the rate charged for all mWh in the month). I think Tesla is runs a complex system trying to balance electricity cost vs customer satisfaction.
     
  8. TexasEV

    TexasEV Well-Known Member

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    Another conspiracy theory.
     
  9. electracity

    electracity Active Member

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    You have no idea how electricity is priced.
     
  10. Rocky_H

    Rocky_H Active Member

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    Your battery is about 2/3 full, so that seems like a pretty appropriate level of charging.
     
  11. jrichey

    jrichey Member

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    I have experienced varying rates at SCs in Florida. I finally got smart and decided to move around to different stalls until I found one that was at the high rate that I expected. Like others have said, it's a common occurrence and the only solution I know of is to move to another stall...
     
  12. ShockOnT

    ShockOnT Quickish

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    Just eyeballing, you should have been getting about 70-80kW at that state of charge.
    Possible reasons for slowness include:
    - cold battery, just started driving
    - cold outside temp
    - dodgy supercharger
    - enforced slowness for battery health (eg too much DC charging)
     
  13. CalBlue 85D

    CalBlue 85D Member

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    The rule of thumb I was taught is that your percentage state of charge (ie 60%) added to the kW you are pulling from the supercharger should add up to approximately 120. So at a 60% state of charge you want to be receiving around 60kW at the supercharger.

    Not scientific, but from what I have seen at superchargers it seems to be a good indicator of expected performance.
     
  14. ShockOnT

    ShockOnT Quickish

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    You should get max charge speed if <50% full (except for right at the bottom).
    The taper starts from about 50% to 100% full, and is pretty linear, so at 75% full you should be charging at 50% of max, at 90% full you should be getting 20% of max, and so on. It's not exactly linear, but pretty close.
    Your max speed is determined by which battery pack you have. The 75 and 90 packs max at about 98kW, the old 85 pack was about 115kW etc, the new 100 pack is about 117kW I think.
    Add to all this that Tesla does its own tinkering, and for example will throttle charge rates if they think your battery has been getting too much DC charging, plus lots of other reasons we don't know about...
     
    • Informative x 1
  15. DarkMatter

    DarkMatter Member

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    The difference between nearly all the way plugged in and all the way plugged in can matter as well. This is a lot of current being pushed through a relatively small set of contacts. You'll notice this because the plug gets hotter. When I Supercharged on Monday, the plug was still cool to the touch upon removal. I had been getting over 100kW at points during the charge with no early taper, on a 90. This was at an older (boxy) Supercharger, in around 80 degree weather.
     

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