Yesterday my car was charged to 90% even though it was as set for 80%. Today it charged to 82%. This happened in my garage at 240VAC 40A. Has anyone else seen this? 2016 P100D 49k miles. Software UTD
Was your Nav set to a distant supercharger?
Last week my app signaled charging complete at 90% and when I unplugged 6 hours later the car was at 95%. It hasn't happened again.
The only time I have ever seen a hiccup in charging like this was related to an OTA update that I initiated while the car was charging. It seemed to charge more than I set it to. It hasn't happened since.
I’ve had it go over by 3%, so not as impressive but it did happen once. Now that it is cooler in the garage it hasn’t happened again. I believe those numbers are all estimations, so I wouldn’t worry too much. Apparently trying to measure the capacity of all the cells is more difficult than measuring a liquid in a tank!
The charge % is the result of a complicated calculation. There is no known way to measure the energy in a LiIon battery.
With a wet cell lead acid battery you can get close by measuring the specific gravity of the electrolyte.
Here's another possibility. due to GPS errors. You may have saved several amperage limits at slightly different GPS points and/or GPS is intermittent at your location. Cement parking garages for example, often block GPS. Keep in mind GPS locations can shift during a 24 hour period by 50 feet or so. This means when you park it could be perceived at one location, but when charging starts, it's at a slightly different location that happens to have a different setting saved for the amperage.
I've not encountered this myself, but I also don't pay that much attention to the daily charging, other than to note that it did charge.
This has happened to my car several times. I set charge limit to 90%. It has gone up as far as 100%. This past weekend, it was approaching 97% so I went and unplugged it. This started happening with the introduction of Scheduled Charging.
I use Teslafi, and the last time I checked, there wasn't a corresponding charge event (past the set limit) in the raw logs. The SoC just slowly crept up.
It's happening to me all the time with scheduled departure enabled. Set for 80%. Leave in the morning at 95%. It's bizarre.
‘17 S75 + ‘17 X75D Both: Uncorked [E]AP MCU1 FSD AP2.5 Intrusion 126.96.36.199 Grin on!
Never happened to me. I don't use scheduled charging. Just plug in when I get home and charge away.
@Bighorn, for some reason my NAV automatically turns on, set to ‘work’ location. And generally I am not using scheduled departure, but this problem has only happened since the firmware update that included scheduled departure. Also, scheduled departure failed to charge one time recently when I tried to use it, although other times it worked flawlessly. I smell a software bug.
Pretty sure predictive mapping is a new feature. Being nearby though wouldn’t support my hypothesis, that distant destinations can trump target SOC.
Yes, happened to me last weekend. Limit set to 80%, and charging to complete by 7 am on the Stats App. Charging stopped according to the Tesla app on Sunday morning, but trickle charging continue to 93% by Monday morning (didn’t drive the car on Sunday).
The auto nav is not connected to the scheduled charging/departure feature.
Auto nav, whatever it is called, can be turned off in the Nav settings.
I had this same issue, switching back to scheduled charging fixed it for me. Was thinking about trying scheduled departure again, but looks like its still broken.
It has happened to me as well, but never that much. I'd set to 70 and it'd be at 72% or 80% and it would be done around 83%. I find it is when I go from very low to very high state of charge. I would joke to my wife that the car was so thirsty it took more than it thought. Like how one feels after a large meal when they haven't eaten in awhile. haha. Never thought anything of it really. But I have seen it, on both my Ses.
I think it is due to calibration issues with the BMS.
Yep, saw this in our MS last week. Looked at SOC and freaked out: 99%!!!!
Hasn't happened again. 40.50.7.
@TranzNDance has it right... This is a bug that came with the new charging methods... All is fine during the week when I drive the car. But on the weekend when I don't always drive, does charge even though it is not needed and goes well above the limit.
Wish Tesla would fix... It has been broken for over 6 weeks. (I'm still on 2019.40.2.1), I even called Tesla to see when the next update was coming and the rep said they were working to harden 2019.40.x.
Only think I did was go back to fixed timed charging... Starting @ midnight.