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Range Charge Issue

Discussion in 'Model S: Battery & Charging' started by rlawson4, Apr 13, 2013.

  1. rlawson4

    rlawson4 Member

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    Atlanta Georgia
    Today I did my second range charge. The drive went great. We drove 237 miles round trip with 11 to spare. We had the A/C on the entire way and averaged 70 MPH. I was very pleased. The only issue is when I woke up and added the range (to an already charged car) it would not go past 261 rated miles. It kept saying 1 minute left to charge for about 20 minutes. We left with the 261 rated. Also (and maybe it's supposed to work this way) but the amp was only at 8/40 while it was trying to top off. It started much higher of course (39/40). Is it supposed to do that at the end of a charge? Should I be concerned that is never ended the range charge and stopped at 1 minute remaining? Finally, is 261 rated ok? I was getting 239/241 standard and now it's 238 regularly. My first range charge was 264. I have about 9400 miles. Thanks.
     
  2. Vger

    Vger Active Member

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    Yes, the current rolls off near the end of the charge. This is normal, and one of the reasons Tesla advises using Range Mode sparingly-- in addition to decreasing battery life, it is not time-efficient.

    The never-ending last minute is probably a function of error in the estimation algorithm. It is very hard to estimate SOC exactly, and even harder to estimate time remaining to charge. This is why they never got around to implementing it on the Roadster.

    As for the apparent reduction in your "full" range, at almost 10K miles, you might be seeing a tiny (~1%) real drop, or it may be just balancing fluctuations. I have seen the "full" rating of my Roadster bounce up and down a bit over 3 years.
     
  3. rlawson4

    rlawson4 Member

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    Thanks. The good news is I was able to drive 70 mph the entire time and still have room to spare. I was very pleased. I guess I am not smart enough to work for the New York Times.
     
  4. Cattledog

    Cattledog Active Member

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    rlaw - I guess I am not smart enough to work for the New York Times. We can all aspire to something in life...
     
  5. rlawson4

    rlawson4 Member

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    Well this morning's standard charge has me down to 237 rated. I hope that it does not keep going down. I drive this car very hard. I routinely drive 200 miles in a day and hope I can still do that for 100,000 miles. I am at 9400 now. 100,000 miles is 3 years for me.
     
  6. Puyallup Bill

    Puyallup Bill Member

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    My car is only a couple of months old, less than 1,500 miles. It is plugged in and sitting at 235 rated standard. If I would restart the charge (go to range, then back to standard), I'm quite sure it will go to 240/241. Will your's?
     
  7. rlawson4

    rlawson4 Member

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    I did a full range charge yesterday. Last night I switched to standard. I ended up at 237. Based on another thread, I don't think this is a concern.
     
  8. Puyallup Bill

    Puyallup Bill Member

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    Neither do I. I'll bet it charged to 240 or so, and then the Vamp took it down to the lower figure.
     
  9. ckessel

    ckessel Active Member

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    For whatever reason, there's variance in the reported miles. My "standard" charge has been anywhere from 232-241 and I can't find any rhyme or reason to the variance.
     
  10. rlawson4

    rlawson4 Member

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    It actually charged to 237. I woke up and checked the iphone app. There was still 20 minutes to go. After the charge was complete it was at 237,
     

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