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Am I being throttled?

Discussion in 'Model S' started by Dublin 'Eer, Aug 7, 2017.

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  1. Dublin 'Eer

    Dublin 'Eer Member

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    I have a 2016 S 75 with around 21,000 miles on it. I've had the car for about 10 months, so I've obviously done quite a bit of longer trips and used Superchargers and CHAdeMOs. I have no idea of the percentage of DC charging and AC charging, but I'd guess it has been around 50/50 or relatively close to it.

    Recently, my supercharging experience has been terrible. This has happened at many different Superchargers, and I'm normally the only car charging. I've never been on a paired Supercharger. When plugging in, I'll initially get a charge rate of 90+ KW sometimes up to 96-97. The charge rate will stay in the 90 KW range for about 10 added miles before the rate quickly drops tick by tick into the 40s or 50s KW range (and sometimes lower) over the next 10-20 miles added and then stabilizes in that range. If I unplug and move to another bay, the charge will start at over 90 KW and then quickly slow again, so it doesn't appear to be related to a hot battery or charge cable.

    Today I deliberately ran the battery low before plugging in with only 24 miles remaining just to assure it wasn't related to the charge rate slowing as the battery filled, and this happened even with almost no juice in the battery. I plugged into all four circuits of an 8 bay Supercharger, and got the same results each time.

    Obviously this is very frustrating and adds substantially to the time spent at Superchargers. Has anyone else experienced anything similar? I have not contacted the service center yet because I wanted to try once when the battery was nearly depleted to see if this happened. Since it did, it looks like I've either got an issue with the car or am being throttled.
     
    • Informative x 1
  2. whttiger25

    whttiger25 Member

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    Every single time you get sub-par charging speeds, call tech support to report it. Very often you'll be told there is a general issue with the supercharger. At the very least they will be made aware of the issue. If there isn't an issue with the supercharger you should ask them to schedule an appointment to have your car looked at.

    Throttling due to high historical DC charging is reportedly not as severe as what you are describing, and resulted in a total 5-10 extra mins max for a nearly full charge from the several accounts I read when it was first reported as an issue. As an example, on a 90kwh battery, while you would previously have had a 115kw max, the new max is somewhere around 95kw. However, this was partially offset by a more gradual decline in power as the battery filled up, partially offsetting the negative affect of the lower max.

    I haven't seen updates on this in a while but that's what was reported at the time.
     
  3. TexasEV

    TexasEV Well-Known Member

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    Yes, the dozens of people who have posted similar experiences in the existing threads on this problem.
     
    • Like x 1
  4. DarkMatter

    DarkMatter Member

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    Are your louvers working okay? High initial charge rate that drops quickly can indicate a battery cooling problem on the car. Same if the condenser fan is not working for whatever reason.
     
    • Like x 1
  5. Dublin 'Eer

    Dublin 'Eer Member

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    TexasEV, although I didn't do an exhaustive search of all threads, I've seen many addressing slow supercharging rates but didn't see any where the charge started at a normal rate and dropped so dramatically almost instantly.
     
    • Like x 1
  6. Dublin 'Eer

    Dublin 'Eer Member

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    I'll check those. Thanks for the advice.
     
  7. MarcusMaximus

    MarcusMaximus Member

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    I've been having this exact issue quite a bit lately, and saw it at every single charger on my 400 mile trip on Saturday. I called support yesterday to report it and ask if they could look at the logs to see if anything stood out, but the guy said the temperatures in the logs all looked within spec and he couldn't see anything wrong on his end.

    To give more information on the conditions: this was all at night with temperatures being ~80F. In each case, I saw the indicated outside air temperature on the dash shoot up to about 20-25F above the actual outside temperature while charging(it would then drop within a minute or two back to the actual outside temperature when driving away).

    Also, I only thought to try this on the very last attempt, so it's only one data point but: When I saw the speeds drop the last time at Harris Ranch, I turned off "Range Mode" in the settings and it stabilized at 72kW instead of dropping down to ~58kW as it was before. I'm starting to wonder if Range Mode isn't just affecting the cabin cooling but also limiting power to the battery cooling while Supercharging
     
  8. MarcusMaximus

    MarcusMaximus Member

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    Agree with this. The other threads have to do with consistent slightly lower charging speeds(e.g. 85kW max instead of 95-96). I haven't seen any other threads about this specific issue(normal maximum charging speed followed by a massive, fast plummet to 40-60kW when still at low battery percentage)
     
  9. DarkMatter

    DarkMatter Member

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    charging slow at Superchargers

    Many parts of this thread talk about exactly this. Check out the graphs on the first post. Look familiar? There's also discussion of the cooling problems later on. If it's happening everywhere instead of just at a few Supercharger locations, it's probably the car inlet connector or a cooling problem.
     
  10. Mrwatchdawg

    Mrwatchdawg Member

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    So my loaner that I have right now has the same issue.

    Starts at 95 and than drops down to about 50.
     
    • Informative x 1
  11. Deanoy

    Deanoy Member

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    Took delivery 09/12/17. Model x 75d. Have supercharger only 3 times with capacity down to 60-70 miles. Starts off great at 95kw and by the time I reach about 125 miles in charge it drops to the 40-50kw range and only continues down from there. Sounds like what others are experiencing. I see the posts in this thread go back to aug 7. Has anyone found out anything new about this problem?
     
  12. DarkMatter

    DarkMatter Member

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    Same location every time? How hot is the handle? That taper does seem a bit hard compared to normal, but my sense of that isn't really well calibrated for the 75s.
     
  13. Deanoy

    Deanoy Member

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    Charged once in Allentown, Pa, once in Harrisburg,Pa and once in Buffalo, Ny. Not sure about the handle each time. Will be supercharging later today in Erwin,Ny and will pay attention to handle heat.
     
  14. BlueRocket

    BlueRocket S90D HW2

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    Just a note... Allentown has always charged super fast for me and maintained fast charging rates up to at least 70% charge
     

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