Gauss Guzzler
Safety Score = 42
Well, there’s also the possibility that he’s still walking home from the airport.
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Help: Horrific battery draining while parked in long term parking structure - I've got 12 days to go
- Thread starter mephiska
- Start date
I've never had the percentage go up, only down. I don't know what you mean by true drain though. Anything that's using car battery is drain right? I've gotten some feedback from Tesla support that the battery is kept warm in cold temperatures and cool in hot temperatures. Also one time the fans ran while parked to dry out the air filters. The battery still takes a whack often. 2% in two quick 45 minute stops over the weekend.
boulder.dude
Member
The % reading is the Battery Management System’s (BMS) best estimate of how much juice is in the battery. It’s an estimate because it can’t count the actual electrons.
When car is asleep, it will re-estimate % remaining.
This is why (for me at least) the % can go up a bit while not parked in.
So my “true drain” Q is how do you know if the loss is real (juice coming out of the battery) vs. a new, slightly lower estimate?
I've only had one month of data collection but the percentage has only gone down every time i look. Maybe I'm overdue to see it bump up. I am no expert but I thought battery life monitoring was a well known solution by now. For instance, phone battery over the last couple of decades.
There's also other corresponding data like in this last charge going from 80% to 70% over two days the driving ate 5kwh. At 81kwh capacity that's 3.1kwh unaccounted for. Even rounding up to 6kwh used that's 25% battery used not driving. This has been the pattern my entire time owning. A huge chunk of calculated capacity is unaccounted for. I'll look at the energy app to see what more I can gather. I know the phone app is using a chunk off that since I have several settings cranked so the phone key will work properly (which hasn't fixed the issue).
There's also other corresponding data like in this last charge going from 80% to 70% over two days the driving ate 5kwh. At 81kwh capacity that's 3.1kwh unaccounted for. Even rounding up to 6kwh used that's 25% battery used not driving. This has been the pattern my entire time owning. A huge chunk of calculated capacity is unaccounted for. I'll look at the energy app to see what more I can gather. I know the phone app is using a chunk off that since I have several settings cranked so the phone key will work properly (which hasn't fixed the issue).
So over roughly a month that I've had the car I've driven 441 miles. At 273kwh/mi that should be 120.393 kWh used which matches the 120 it reports. I've charged it to 80 three times and it came filled at 80, with it at 62%. I charge it usually around 20% but to be conservative let's call it 25%. That's 1.93*84=148.23, or roughly 28kwh used up while parked. That's about 25% of the energy consumed driving, or 20% of total energy consumption over the last month. I had no idea this would be a factor when buying this car.
Looking at Tesla energy app I see standby is the major contributor in that consumption. Someone somewhere mentioned that the car can continue to keep the climate control on an hour after leaving it so I'll be turning it off when I get out to see if that makes a difference. Surprisingly the mobile app took very little. I expected a bigger chunk since I have it set to never sleep (again for another issue).
To be fair, I did have sentry mode on the first day or two, and there has been a few days my car was in cold mode (snowflake on monitor). It also ate 2% last night which probably is because of the update
Looking at Tesla energy app I see standby is the major contributor in that consumption. Someone somewhere mentioned that the car can continue to keep the climate control on an hour after leaving it so I'll be turning it off when I get out to see if that makes a difference. Surprisingly the mobile app took very little. I expected a bigger chunk since I have it set to never sleep (again for another issue).
To be fair, I did have sentry mode on the first day or two, and there has been a few days my car was in cold mode (snowflake on monitor). It also ate 2% last night which probably is because of the update
Power off?
I've had really bad drain this week. Charged to 205 miles on Tuesday (6 year old S75D - 60k miles). Drove home (20 miles) and have done three short 2-3 mile trips since. I know it is cold (Cheltenham) and short trips are not ideal particularly in the cold but I'm down to 130 miles including losing 12 miles (6% since 1:30am today) without going anywhere.
I may be on the original 12V battery (I had it serviced just before the four years were up and, tbh, I don't know if the 12V battery was replaced so I assume not).
From this thread, I gather that it may be multiple recharges of the 12V battery causing the loss. Is it wise to power off the car or would that just about 'guarantee' that the 12V battery would go flat.
TIA for any tips
I've had really bad drain this week. Charged to 205 miles on Tuesday (6 year old S75D - 60k miles). Drove home (20 miles) and have done three short 2-3 mile trips since. I know it is cold (Cheltenham) and short trips are not ideal particularly in the cold but I'm down to 130 miles including losing 12 miles (6% since 1:30am today) without going anywhere.
I may be on the original 12V battery (I had it serviced just before the four years were up and, tbh, I don't know if the 12V battery was replaced so I assume not).
From this thread, I gather that it may be multiple recharges of the 12V battery causing the loss. Is it wise to power off the car or would that just about 'guarantee' that the 12V battery would go flat.
TIA for any tips
I'm a new owner but fwiw given your description that seems about what I'm experiencing. I found the energy app on the car to be very insightful. Have you looked at it?
I have seen similar behavior a few months back with the original battery but after I "preemptively" replaced the battery, I haven't seen anything like this.
Power off from the menu really doesn't power off based on my observation. The screen sure comes up quickly when opening the door to be in a full power down mode.
Blanks the screen for napping? That's all I can come up with.
Truly long term storage should disconnect the 12v (and possibly the fireman's loop) as long as the temp is moderate.
andy00778
Member
I left my M3 long range parked for 17 days ( south Florida) while I was in the Antarctic and was pleasantly surprised to find it only lost 3% in all that time. Sentinel mode was off, as well as auto cooling etc. I didn’t check in with the app so not to awaken car ( internet was so crappy I didn’t even want to try).
From what I understand (1) Sentry mode when ON will use the battery (2) Auto cooling when ON will use the battery.. but (3) they won't drain and empty the battery because the software would turn them OFF when the battery is down to 20%, it's a default
Pros: please correct me
Nevertheless, IMO turn them off when parking at airport or airport hotel UNLESS they have charging stations when U come back
Cabin Overheat Protection is only active for the first 12 hours when parked. You can extend this 12 hour period by an additional 12 hours by driving the Tesla vehicle or using the Tesla app to remotely unlock and then re-lock the doors.
COP set to Fan Only (No AC) uses ~1/3rd as much energy from the battery over the 12 hours that COP with AC uses.
You can now manually precondition the Tesla Model Y using the Tesla app even if the battery state of charge is less than 20%.
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[COP set to Fan Only (No AC) uses ~1/3rd as much energy from the battery over the 12 hours that COP with AC uses.]
Fan only would not cool temp when all windows are closed. Am I wrong?
You are wrong. The fan draws in air from the outside just in front of the windshield under the hood. I assume Tesla engineers were smart enough to turn off 'recirculate' mode for the duration of COP operation even if it had been turned on.
COP in Fan Only mode cools the passenger cabin but can't hold the same 105F cabin temperature as COP with AC. It helps keep the cabin from baking too badly; a blocking sunscreen for the windshield and glass roof would be best as would parking under a roof structure.
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