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Erroneous energy reading?
I have a Model 3 SR+ and I have read the manual.
Has anyone had a recent experience with an erroneous reading on their display? At work, in an interior garage, I have had repeated episodes where I get in my car at the end of the day and find a 5 to 6% drop from where the battery said it was when I parked it. This is in roughly an 8 hour day. I called Tesla and the really great service tech---I mean he was really helpful----said he ran full diagnostics on it for several days, and was able to see that yes, while it was showing that drop, it would restore the 5% every night overnight, at about 1 am. So in other words, the battery is never actually depleting that much---it's just saying that it did. Is anyone else having this issue?
Has anyone had a recent experience with an erroneous reading on their display? At work, in an interior garage, I have had repeated episodes where I get in my car at the end of the day and find a 5 to 6% drop from where the battery said it was when I parked it. This is in roughly an 8 hour day. I called Tesla and the really great service tech---I mean he was really helpful----said he ran full diagnostics on it for several days, and was able to see that yes, while it was showing that drop, it would restore the 5% every night overnight, at about 1 am. So in other words, the battery is never actually depleting that much---it's just saying that it did. Is anyone else having this issue?
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This is just an example, and the numbers are taken from some events others have seen and may vary with other factors. Low SOC is worse than higher SOC levels, but it still applies. The difference is the battery has enough power to self-heat itself and get that range back. It seems strange to use power to get more power, but that's just the way the battery chemistry works.
Anyway, be wary when you get to low SOC. The range shown will be fairly accurate - so long as you continue to your destination or charger. Stop and let it cool even for 30 minutes, and you may find no range is available.
Soon as I parked, a little message popped up stating that as the car got cold, the range was going to drop. For that matter, the same message popped up on the way back at another Supercharger. Note that outside temperatures at the time were in the 20F range.
So, yeah, even the car messages state that, just sitting there, the car's range will go down as the batteries cool.
If not, then I am going to go with that it is cold weather reduction and you gain it back as the battery warms back up. a 5% drop over 8 hours is approx 470W constant draw, so either it is cold related temporary reduction in what the car tells you is available, or something is on and drawing power. The only things that would be causing a power draw would be sentry, summon standby, or a third party app keeping the car awake.
How old is your M3? If its more than 2 years old your 12v could be weak and the car is constantly charging it from the main battery.
> The last one said it is not truly losing the power---it's just displaying a 5% loss, and then it actually restores it overnight around 1a.
Did you check? Does it actually come back like the mobile tech said?
You can try and contact Tesla and ask them to look at the logs for a certain time period and see what is drawing power. As I said, 5% is about a 468kW draw over 8 hours.