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Tesla may have fast charging hard cap, Supercharging speeds permanently reduced

9477 Views 77 Replies 22 Participants Last post by  Steverino

An owner of a Model S has received official confirmation from Tesla that ALL Tesla's now have a hard count of how many fast charging sessions are allowed (Supercharging OR via CHAdeMO adapter). Once the hard count is reached, max Supercharging speeds are PERMANENTLY reduced FOREVER.

Wow! If I was a Tesla owner I'd be pissed! Never being told about this restriction up front. Supercharging not what it used to be, eh?
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Almost 32,000 miles on my 14 month old Tesla Model X with quite a few supercharges on roadtrips.

The below from last weekend is pretty good, right? I'm still getting 100+ kW at various SCs depending on my starting SOC.

bro1999, remind me again what your Bolt is getting (44 kW?) :0 -- you are a little overboard on the Tesla bashing aren't you :)
I also think it's funny BRo will latch on to each and every rumor of something bad with Tesla, and run with it like it's the truth. Point out any flaws or question GM's designs, he's quick to defend his Bolt EV purchase as if multiple generations of his family's honor depended on it. :p

Most of my ~50k miles come from very long, L3 powered road trips. Colorado, Iowa, Florida, Nashville, with tons of Houston, Austin, and San Antonio trips over the past 3+ years. I would be surprised if it's under 200 Supercharges, plus 20 or so CHAdeMO sessions. I'm still getting Supercharging rates up to slightly over 119kW, if the planets are aligned. I think the dude is taking misinterpreting things, quite a bit and running with it. Hilarious that people keep bringing up Tesloop's 200k+ mile cars that always charge to 100% on a Supercharger, 2-3 times a day, with no L3 rate degradation. How in the world is this the first dude to have this happen? Does he think he's the only Tesla owner to do DCFC charging, to the extreme?
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This isn't a rumor if you read the Tesla forum link.
I read every page of it, and the screenshots of the OP's RO still doesn't point to a real limit. As others have said, it's probably a new service person that isn't sure what's going on. Some people run into degraded Superchargers, now and then. When I plug into one, I just move my car over to the next one and call Tesla. Plenty of people don't even bother to see what their charge rate is, most of the time.

I've got some pings into some of my Tesla service contacts that have worked on my car for the past several years. I'd take their word over this speculation.
My first Tesla service person said there is no limit, like that. They stated the only L3 limits in place are on the A-packs (well known limit to 90kW), when you're sharing a Supercharger cabinet and the demand is higher than the cabinet can supply, temperature based limits on either the battery pack or the Supercharger gear, or if you are at 0mi range and you plug into a Supercharger, which drops the amps way down to bring it up to a safe voltage to do a full kW session.

Awaiting my second and third contact's response.
They may not know. Could also be a programming decision that was never intended to matter. Sometimes a programmer has to put in a number so they'll pick a number that couldn't possibly happen. Till it does. Had this happen with programming teams more often than I care to admit. I doubt this is the case but it could be. It also might just be a remnant from an earlier time. No doubt some of this code was written when the effects of DC charging were less well known and this was put in for protection. Given how Tesla operates I can guarantee you the code is not top drawer.

We'll get more information. Might even turn out the poster is FOS. In any event, assuming there is a limit, as mentioned above, I doubt many Tesla owners will ever hit a limit. So not a big deal one way or the other. The bigger deal would be if the DC charging is actually effecting the chemistry. From all we know this seems unlikely but it's possible.
Considering the Dallas service center supports thousands of Teslas with millions of Supercharged miles since 2012, this situation should have popped up at least once, if it's real. And don't forget the Supercharger hogs that live in LA apartments, and choose to use Superchargers every week! Those people would have been crying about this limitation, well before the OP since they are a "different kind of special."

The OP's situation is anecdote, which gets confusing by some odd wording by the Service Advisor.

My second source came back and said: "There isn't any limit to the number of L3 sessions on the car. It doesn't ratchet down the charge rate. :eggplant emoji: "
thread re-opened (at least until more is learned about this potential issue/practise)
But please keep it civil people
Thanks. I'm waiting on my 3rd contact to verify, but he chuckled when he understood the question. He said he would have seen it pop on on a ton of cars, well before this week.
So it looks like any peak charge rate slow down is due to Tesla keeping on top of the cell's physical chemistry. This is the same thing that happens when the cells are cold, or the level is too low. Considering it's a rare thing like Scott pointed out, to have the stars align anyway for a charge session that sees 120kW for only a few minutes, I don't see it as being a big deal when my car gets to that point in its life. Who knows, maybe I'll swap in a 100kW battery or something by the time that happens.
And that is what many Tesla owners want to know; unfortunately, JonMc did not address all the questions people want answered.

-How many DCFC sessions before this max SC charge rate neutering takes place?
- Does CHAdeMO charging have an effect on how fast the reduction happens? If so, do 18 and 50 kW charge rates have the same impact?
- Is rarely ever charging AC a factor?
- Is the limitation based on time DCFC'ing? Or sessions? kWh charged? Miles driven? All of the above?

Tesla's continued lack of clarity on the issue is still a huge point of contention of owners. I don't think the thread on TMC would have 800+ replies if it wasn't. ;)
Hilarious that actual Tesla owners are telling you that this is not a big deal, but you, as a non-Tesla owner are making it out to be this scandalous thing.

Don't you have some actual rage to vent about your own car, since the manufacturer has been tight lipped about everything, regarding its substandard, slowest-on-the-market DCFC capabilities?

Thanks for your concern.
-An actual Tesla owner
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