I have had my Tesla Model S 90D since December 2015, driven 95.000 km, and it is the greatest car I have ever had. I love Tesla and I am active in the Danish Tesla forum (Teslaforum.dk). The reason for posting here is to get access to more owners meaning more data. I am not a troll.
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I have had my Tesla Model S 90D since December 2015, driven 95.000 km, and it is the greatest car I have ever had. I love Tesla and I am active in the Danish Tesla forum (Teslaforum.dk). The reason for posting here is to get access to more owners meaning more data. I am not a troll.
Thanks for your contribution
As I wrote in my initial post it seems to be the new battery chemistry introduced in the first 90Ds where the most significant changes in peak are registered.
It will be interesting to see if we can see some patterns when we have more data.
You know now that I think about it I could see this being the case for the 90 kwh packs. They don't charge as fast at the bottom end either according to other owners. I look forward to seeing the results.
FYI: you might get better traction if you post a photo of the response from Tesla engineering on your issue. Assuming it was in writing on your service reciept or something.
dhanson865
Well-Known Member
I'm surprised at the negative tone of replies. After reading the 691 HP threads and the Launch mode / Power limit thread you'd think people would be at least a little open to the possibility that something is happening.
Your data set is small but you didn't say you had proof, you said you had a theory (as explained to you by someone else) and would like more data to prove or disprove. Seems logical to me. Live long and prosper.
jelloslug
Active Member
Like I said. If it were there, it would have been found already.
Please don't waste people's time with stupid memes. Post data or post nothing at all.
you'll need to provide a better source of your information for this "news" to be taken seriously .
bonnie
I play a nice person on twitter.
Are you sure? The 90 KWh battery was released August 2015. If most people put 15,000 miles a year on the car then most 90 KWh battery packs have less then the required 30,000 miles.
You can't feel facts and truth.
As cells age, their IR increases which results in more heat at the same rate of charge when older than when newer. So it does make sense but it doesn't mean you can't charge the previous faster rate, it just means the battery will degrade faster if it experiences more heat over the same period of charging.
That said, I would assume that this is baked into the cost of the battery and the cost to warranty it. Tesla never told me that my car would charge slower as it ages which it does in fact now do. I just posted a partial curve in another thread 3 days ago showing how my car is charging at a slower rate at each each corresponding SOC now vs when it was new.
My 1995 Lexus which I sold two years ago with 334K miles on it accelerated very slightly faster than when it was brand new according to my g-tech pro. ICE cars shouldn't lose power with age provided they are properly maintained.
Thanks for your contribution
As I wrote in my initial post it seems to be the new battery chemistry introduced in the first 90Ds where the most significant changes in peak are registered.
It will be interesting to see if we can see some patterns when we have more data.
The 90 batteries introduced Silicon into the chemistry to increase capacity which is a known battery life de-grader. Tesla has yet to explain how they avoided accelerated degradation from this change. I'm not convinced they did avoid faster degradation so it makes sense they'd do what they can to slow it. Lithium Ion batteries with Silicon also have faster increases in IR as they age which results in even more heat during charging.
bonnie
I play a nice person on twitter.
So, to clarify - are you saying that supercharging in general, since it is at a higher rate of charge, is degrading the battery each time?
stopcrazypp
Well-Known Member
Given the increase in IR, for the same load, you get less energy out of the battery. Thus at the same "charge rate" you actually get less energy out of the pack. Tesla's response may have been referring to that.
Also most lithium ion chargers use constant current constant voltage (CCCV). A different IR may change the voltage at the CC stage, which may change charge power naturally.
The OP made some unsubstantiated claims (the change point being 30-40k), which is why the backlash.
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I clicked on the title of this thread because I have noticed that SCs in Southern California seem to be running closer to 90kW lately, I was in Hawthorne last night and arrived at 60 miles left and plugged in and the maximum was 91kW when I seem to remember it being closer to 120kW before.
I've also seen strange behavior in Redondo Beach a week or so ago and in Santa Ana as well.
We have over 72k miles on our S (2013). Santa Ana has been "flaky" lately, but not sure about Redondo.
I've also seen strange behavior in Redondo Beach a week or so ago and in Santa Ana as well.
We have over 72k miles on our S (2013). Santa Ana has been "flaky" lately, but not sure about Redondo.
3Victoria
Active Member
I assume (bad idea usually) that Tesla's charge algorithms take into account battery temperature as well as max current and voltage, as shown above. If a battery changes, then it is expected that the charging will change to keep the battery temp/current/voltage inside its parameters. It is possible the 90 batteries age differently than others. Still, rather than characterizing this as anything nefarious, it seems to me to be a good thing: maximizing battery life.
Yes, but you also charge less efficiently. You lose a higher percentage of the charge that goes in as IR increases resulting in more energy wasted as heat.
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