I have my Tesla charge limit set to 50 percent, but the app shows only charged to 49 percent. Is this a known issue or bug?
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Charge only to 49% when limit set to 50%
- Thread starter ChairmanMeow
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nomis_nehc
Member
I am going to guess this is a joke post right?
SilverSp33d3r
No Longer Silver
I must be missing something since everyone thinks this is a joke post. I leave my Tesla plugged in, so my expectation is that it will charge to 50% (the limit I defined) and show 50% in the app, not 49%.
You'll notice it says "Charging Complete" above the 49% stat.
What am I not understanding?
Mrbrock
Well-Known Member
If you search for and read older posts you will see this is quite common when selecting a charging limit. It varies from time to time.
And since others are bound to jump in, is there a reason you are setting it at 50%?
And since others are bound to jump in, is there a reason you are setting it at 50%?
That electricity is not gas (liquid) and measuring charge state of a battery is not quite as precise as that, so seeing 1% difference in completed charge and set charge level is completely acceptable.
However, I was seeing 50% before when I set the limit to 50%. Only past month or two am I seeing 49% and not 50%. Perhaps it has something to do with range update?
Uncle Paul
Well-Known Member
Your Tesla might even be charging to 49,99%, but not quite clicking over to 50%.
Best advice is not to worry about it. Effects nothing. Tesla gauges are not precise engineering quality gauges, but designed as guidelines.
Best advice is not to worry about it. Effects nothing. Tesla gauges are not precise engineering quality gauges, but designed as guidelines.
Known issue, not necessarily bug. It's more a result of Tesla trying to give you less information so as to not overwhelm their customers.
There are a few common things at play here:
There are a few common things at play here:
- The SoC and range numbers are rounded. That "50%" may have been 49.5%, right on the edge.
- Temperature impacts the displayed SoC/range. This effect is pretty minimal in summer temps (yet still present), but with regard to the first point can push it so that it looks a whole percentage point down.
- For example, if the battery was cooler when you saw 49% than when you set the 50%, that could partly explain it.
- The car won't keep it at exactly the target setpoint. It allows the charge to drift down a bit before topping it back up.
- It's really hard to not accidentally budge the setpoint a little left or right when lifting your finger off
nomis_nehc
Member
Uh, another simpler explanation. It charged to 50%, but by the time you looked at it, from phantom drain, or because it's been hotter recently, it used some electricity to cool the car/battery, whatever. Worrying about 1% difference when there can be a ton of variables is just silly.
Sometimes my car will over charge by a percent or two.
OMG, please help. I set my charge level to 80% and sometimes it goes ALL THE WAY to 81%! I don't want my battery to brick. Please tell me what to do.
Sometimes this community really tires me.
OP wasn't even worrying or treating it as a big deal, clearly. Just asking a question because the car did something different than usual. Something we've all done.
OP wasn't even worrying or treating it as a big deal, clearly. Just asking a question because the car did something different than usual. Something we've all done.
Ready to have your mind blown.... 102%
SilverSp33d3r
No Longer Silver
the below quote was what I had in mind.
Does it say “charging completed at 5:55AM at 49%” as a notification or just charging complete and 49% when you open the app?
hello; i am having this issue also: m3 lr-rwd. Sometimes i can set my charge to 49% (which wasn't possible when i bought it), and when that is the case my max is limited to 98%, seems to be related to my gen 3 wall connector, because i use a mobile connector at work; still 240v, no issues like this- only ar home. Some nights its set for 50%, but shows complete at 49%.
I work customer support at a major Controls company.
We would call this a “limitation of the technology”. The estimator isn’t perfect, but the difference between 49-50% is simply not all that meaningful.
We would call this a “limitation of the technology”. The estimator isn’t perfect, but the difference between 49-50% is simply not all that meaningful.
OK... It's really pretty easy to logically notice that the percentage is not super accurate OR maybe too accurate.
One percent of a big battery like this is a good amount of energy. Let me give you one of my simplified examples.
Let's say the battery is 100KWh. That means that 1% is 1KWh. That's a LOT! So if your car was at 50.5KWh, what should the car display to you? It can't do fractions on 1 percent. In this case the car will just say 50%. Now when you tell the car to charge to 50%, IT WILL EXACTLY STOP at 50.0%. and any temp fluctuations that maybe drops it to 49.9KWh will make the car show 49%. You can test this. Charge to some percentage and then start driving. It will very quickly drop one percent. You might go OMG, I drove 20 feet and I lost one whole percent. MY CAR iS BROKEN! No, chill out.
If I want a full 80 percent charge, I always charge to 81%.
One percent of a big battery like this is a good amount of energy. Let me give you one of my simplified examples.
Let's say the battery is 100KWh. That means that 1% is 1KWh. That's a LOT! So if your car was at 50.5KWh, what should the car display to you? It can't do fractions on 1 percent. In this case the car will just say 50%. Now when you tell the car to charge to 50%, IT WILL EXACTLY STOP at 50.0%. and any temp fluctuations that maybe drops it to 49.9KWh will make the car show 49%. You can test this. Charge to some percentage and then start driving. It will very quickly drop one percent. You might go OMG, I drove 20 feet and I lost one whole percent. MY CAR iS BROKEN! No, chill out.
If I want a full 80 percent charge, I always charge to 81%.
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