Battery emptying itself while parked?

[tmrqs]

Hopefully a new owner soon, I have a question about how much battery gets wasted overnight, if parked and not charging.

I rented a Tesla 3 on a couple of occasions and I could lose as much as 30% battery overnight, leaving it in a hotel parking unplugged.
Seems it was always waking up to record activity/people walking by the car, which I imagine is what used all that power.

Is that something I need to worry about with the MME? On average, is there an expected hourly percentage of battery consumption while it’s parked (and not charging)?

Thank you!

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[heisnuts]

The only time I have seen a 12v battery drain is when using a 3rd party app that keeps pinging the MME draining the 12v battery. I had my MME parked for a week once and it stayed right at 50% the entire time.

 

[Kamuelaflyer]

I had total knee replacement surgery last December. My MME was down for 5 weeks. I parked it at 60% state of charge and it was still at 60% when I started driving agsin. Tge 12 volt was fine was well. It’s not a serious concern and there are things you can do for extended layoffs to mitigate any possible vampire drains.

 

[mwtechy]

Depends on how cold it is outside of course but I haven't notice it drain much, maybe 1%? The 12v is another story and I'm assuming they fixed it in a software update and never bothered to tell anyone. But yeah what they said above you shouldn't have a problem with the 12v either. I however do not know what happens if the car goes into deep sleep mode and you have something draining the 12v.

 

[Monke]

The car was parked in a garage for 12 days and it stayed at 80% the whole time. When MME was with a body shop for 28 days, the battery drained from 50% to 46%. The car had to be moved here and there.

 

[DrSteveBrule]

Hopefully a new owner soon, I have a question about how much battery gets wasted overnight, if parked and not charging.

I rented a Tesla 3 on a couple of occasions and I could lose as much as 30% battery overnight, leaving it in a hotel parking unplugged.
Seems it was always waking up to record activity/people walking by the car, which I imagine is what used all that power.

Is that something I need to worry about with the MME? On average, is there an expected hourly percentage of battery consumption while it’s parked (and not charging)?

Thank you!

I had a Model 3 two cars ago and it was worse in this respect, regardless of whether sentry mode was active or not. I don't think sentry mode is a significant battery drain on the scale of EV batteries. I think it did more to maintain battery temperature when parked at the expense of state of charge. I just got in the habit of plugging it in all the time. I've had a garage for years, so it's no big deal. OTOH, my Mach E seems to fully power off and not try to maintain battery temp. It wouldn't shock me if Model 3s were better at this by now. The pace of software change is significantly higher with Tesla, which is a plus in my professional experience.

 

[Shayne]

Depends on how cold it is outside of course but I haven't notice it drain much, maybe 1%? The 12v is another story and I'm assuming they fixed it in a software update and never bothered to tell anyone. But yeah what they said above you shouldn't have a problem with the 12v either. I however do not know what happens if the car goes into deep sleep mode and you have something draining the 12v.

My 190 - 220 mile at 85% goes down to 110 miles in the winter but the big battery loses nothing and still says 85%. I have had problems up north with the 12V dying in the cold for the last 2 winters with nothing pinging anything here. Who would care if it does as it has 85% of a 100 kwh battery and is plugged into 240V. That should be enough to keep a 0.0003 kwh battery charged? They say they fixed it the third time just like the first two but winter is not here yet. I am hoping it is fixed as last winter it started in December and was not fixed until it warmed up in April. There are a few up here in the provinces that experienced this. I am onboard with a silent fix as long as it gets fixed. Always thought it may be a logic/drain problem and may not of needed a new HVJB and BECM? Definitely needed a new 12V in a bit less than a year.

@Kamuelaflyer best wishes on the rehabilitation. Hope it is going well.

 

[mkhuffman]

The 12v is another story and I'm assuming they fixed it in a software update and never bothered to tell anyone.

I had the dealer updated all my software modules in February and it fixed the 12V battery maintenance issue. So yes it was fixed, and no they didn't tell anyone. But it was reported in this forum! ?

As others have reported, the MME does not have a vampire drain issue. Other BEVs do, and mainly it is because they use the HVB to run things like Sentry mode.

It requires a lot of energy just to access the HVB because there are a myriad of systems that monitor and maintain the temperature of the battery. The MME does not use the HVB when the car is off, except when the LVB charge gets low, and then it is recharged by the HVB. As long as there is no significant drain on the LVB, the HVB never comes on and consecutively there is no vampire drain.

 

[tmrqs]

These are all very reassuring comments, thank you all!

The experience with the Tesla 3 was odd, especially because the temperature wasn’t even fluctuating much - a constant 75/80 degrees day and night. And seeing my driving range and battery having dropped by 30% was pretty scary.

Glad it’s not a concern with the Mach-e!

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