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From the article: Tesla has rolled out a new software update aimed at significantly reducing Sentry Mode’s energy consumption. This feature was first announced as coming earlier this year and expected in Q2, but it has only been released now, and apparently only for the Cybertruck. Back in February of this year Drew Baglino, the now former SVP Powertrain and Energy Engineering, revealed in a post on X that the company was working on a software update that would reduce Sentry Mode’s power drain by up to 40%. According to independent tests, Sentry Mode can consume up to 10-15% of the car’s battery per day.
Sentry mode is by far the biggest power draw in an idle car. I think the reason is that the FSD computer needs to be running for Sentry mode to work. Honestly in New vehicles they should have a separate, smaller computer for Sentry mode. A raspberry pi should work fine.
Totally. I use more power running sentry mode parked at work that I do driving to and from work
I mean, my older laptop can throttle CPU performance and it reduces the power draw, so presumably Tesla can do the same, right?
I hope this is the case but "released" is not really the case at least not yet. Apparently at least one CyberTruck owner (but apparently only in Mexico) got a update that said it had Sentry mode power savings in the Release notes. But it seems suspicious as why only CyberTruck Owners in Mexico reporting this. If 2024.38.4 really had this then why haven't the other US based CyberTruck owners also reported this in their release notes. And this update may only fix a power usage problem for CyberTruck which may not even be applicable for the rest of the Tesla's.
I don’t think 38.4 is available for the US Cybertrucks. Our latest version is 33.15
What gives out that this will be available for other platforms than the newest one (Cybertruck)?
The CPU is liquid cooled so just running the cooling loop could also be a significant energy draw.
Me too. 2% driving to work, 7% sentry mode, 4% preconditioning the car to drive home, 2% driving home. It's kind of hilarious.
Adding a raspberry pi for sentry mode is such a great idea. Have you considered sending your resume in?
According to [Teslascope](https://teslascope.com/software/2024.38.4) all models except the CT are getting it. Seems atypical that a release would only give a feature to the CT otherwise wouldn’t it be in another version number?
Isn’t this the update that will shut off all usb ports and 12v ports ? It’s been known to be coming soon as an update.
Why precondition takes so much?
When I had my older Model 3 without a heat pump, it would eat way more than that pre-conditioning in the winter. In the summer, it wasn't as bad as using heat, but it still ate quite a bit to get the temp down.
I honestly wish they would let us control whether or not to power the 12V outlets when the car is off or in sentry again. Even if they want to give a big fire risk warning I'd rather have the option.
🛑 Killing cars are airports lol. Anyone who is not tech savy and doesn't turn it off literally the car dies. I forgot once and luckily a charger was 10m away Omg. Downvoters never had my issue so good to be you I guess lol. Try driving to a charger that is far away from airport
I hope they’re not managing Sentry through a separate efficiency chip for the Cybertruck. If that’s the case, our vehicles will never consume less
sounds like unique patch for cybertruck?
THIS
It cold
2%? You ought to take your bike instead, lol
Doesnt it turn it automatically off at 20% anyways? And apparently with sentry, summon etc off the car only loses like 1% a week in idle
I do in the summer! :) Winter there is far too much snow and the roads narrow and there are big trucks everywhere, it's simply not safe without bike paths.
Yesn't. Modern smartphones often have multiple cores, some of them energy saving (for small background tasks) as well as some performance cores. I think the ARM MacBooks also have it, not sure. So yeah no, "simply throttling" a CPU isn't enough if you really want to be efficient.
Buy snow tires. 👈😎 👈
Same thing for just sending commands through the app. Hate having to refresh the app or tapping a command and waiting up to 30s for the car to wake up and finally do the thing I want it to do. No reason why they couldn't just add a tiny pi-like computer to take care of cell and waking up the car for commands without having to really worry about idle drain.
I would, but where I'm from we get an absurd, truly absurd amount of snow, like 2-3 feet overnight a few times every winter, and it gets to -40c sometimes and is usually -20 to -30 most winter days. Add to that icy roads, narrowed streets due to snowbanks, deep snow, rocks and gravel, and big trucks everywhere that don't know how to drive, and a total lack of car-free bike paths, and you can see how winter biking isn't super practical up here.
It does now thank gosh, my car got to 1% before the update . But sometimes that isn't enough to get to a charger. My model 3 got to 20% in four days from full due to all the airport cars setting off sentry driving by
Ez. Get a snow plow attach to front of bike. Buy bigger jacket. Buy the winteriest tires ever made. Buy reflective vest. Buy fast annoying life saving light for back of bike. Get everyone advanced driving training. Petition the city for carefree bike paths. Totally practical. Pz. 👈👈😎 😎👉👉 👈😎👉 👆😎👆 👇😎👇 👉😎👈 🫲😵🫱
Yeah, I was just joking. I live in Denmark which is basically an entire country built to provide ideal conditions for cyclists. I know it’s not at all like that in other parts of the world. But good on you for taking the bike when the weather allows it!
40% sure is an improvement, but I’m still a bit surprised how much power it uses. Is there a specific reason for it?
Genius
Thanks. I went to public school.
I might be wrong but this is just based on my general understanding of the system. The main issue for power consumption is the fact that the cameras are attached to the FSD computer, which is attached to the MCU which is then attached to the USB ports. So they have to stream the cameras through the FSD computer, then into the MCU where motion detection occurs, that then needs to be constantly compressed and then stored to disk. So basically the entire car has to be on at all points. I was hoping for hw4 and now for ai5 to have a dedicated USB port that is hooked up directly to the FSD computer with a tiny coprocessor so that everything can just be done by the FSD computer in a low power State. For now I'm hoping this fix is them moving the motion detection and maybe even the compression over to the FSD computer, so maybe the MCU only gets woken up when there is an event and that gets written to disc. Just my hunch though.
Yeah it does make sense, but it’s still an obscene power draw. 7-8 kWh each day is estimated some places. That’s almost twice of what a PS5 can do at full speed if run 24/7
The power requirements doubled going from HW 2.5 to 3, sentry consumption used to be about half. I suspect that the update throttles down CPU usage and sleeps components that don't need to be awake. Right now it seems everything is on whether it is needed or not. Should get us back to close to where we started with HW 2.5.
No it’s not. That was a silent update
It's definitely a bit less than twice, I don't have one but apparently the ps5's consumption is about 160 to 200w I think Sentry remote averages about 240 but you're in the ballpark of 1.5 PS5s. Which is a lot, but once again you are running four cameras, an entire FSD computer and the entirety of the MCU. And they're not just on and idling they are actively compressing and running motion detection. I'm hoping maybe they're using the occupancy Network or something to just see if something gets close to the car. It's definitely a lot of consumption, but because the systems not air cooled you're also going to occasionally have to run the pump and potentially the radiator etc. It's definitely high because it wasn't designed to do what it does. A properly designed system could probably run for a year off of the power consumption that the current one uses in a week.
Yeah, maybe my numbers were exaggerated a bit. I’m running an entire suite of security cameras in my house with AI based events at like one tenth of the power draw of my Tesla.
Oh it can definitely be done, like I mean realistically the cameras are probably single digit number of Watts each. So even if we just say 20 watts for all four. The big thing is though your setup is going to be running on a system that was designed to do that thing. That's why I don't know why hw4 wasn't very different. Sentry mode was an afterthought, the system wasn't designed to have the cameras on and running but not have the car on. I mean honestly they might be able to get 40% savings just by using a substantially more optimized compression or motion detection algorithm. But I have a feeling it's got something to do with keeping the MCU off. I guess we'll have to see what hardware this comes to. If my hw3 Intel vehicle gets it, I'll be happy.
4 percent precondition to drive home? How long before you leave do you turn on climate? Pop it on 15 minutes before it shouldn't even drain a percent.
It takes 4% to precondition in the morning as well. Part of it might be that I have a standard range 60kWh battery, part of it is that it's often -20 to -30c outside.
ah that makes more sense.
Yep.
I hear that sentry uses the 12v / 16v battery for power, then the car charges that as it gets low.
Meh we’ll see
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Close, it is still all doing that even in the cybertruck. They won’t give a rw port on the apu, they want to keep it as isolated as possible and pass through to the mcu for this stuff. Transcoding is faster on the mcu than apu. The reason why is they started implementing power saving and under clocking in the kernels for the first time, probably made easier with changes they have made in general to the kernels over the past year. Also why all the usb ports turn off now as well.
Yep, the main pack stays disengaged as far as I'm aware, and if you're plugged into the wall every couple hours you get little top-ups from the grid.
I realized I was spending like $10/month just to have sentry on at work, so I finally excluded work. I just try to park in view of the security cameras
I do leave on Sunday return on Thursday trips frequently and come back with ~60% and that includes preconditioning and driving to the airport (about 8 or 10 miles, I don't know off the top of my head). If it was a problem in the past, it hasnt been a problem in the three years I've had my car.
I really hope they allow us to turn that back on in some fashion. API control would be ideal
Iterative improvements
Nice maybe because I have the first three
I'm at no means an expert, but I would suspect that motion detection runs on the FSD computer as a neural net, and the MCU doesn't have to compress any video unless a motion was detected. So the MCU can basically idle most of the time. Which would make me guess they either made the MCU better at idling, or the sentry NN more efficient. Or both.
No. Main pack stays engaged for sentry. That's how i keep my fridge running when I'm not in the car.
Ok, at -30C I'd suspect part of the "sentry mode power use" also is keeping the car from freezing solid... ;) ;)
Because devices that are plugged in can catch fire when they are powered, but cannot when they are not powered. And an increase from 0 to any number is an increase...
Because people plug in hinkydink Aliexpress and Temu crap and then wonder that its not up to western safety standards…
I don't think even running the fridge though means that it keeps the pack engaged, that's what the 12 volt is for. Having an extra load just means it would have to charge it up more often. Although it might keep it to engage just so it doesn't wear out the contactor. I'm pretty sure during Sentry mode I've heard the contactors click occasionally.
Interesting. I thought they released the software update in the spring, and that something was wrong with my 22MY. 3-4% battery loss in 8 hours. Recording and processing many cameras sure is intensive. But the overhead of keeping the entire system across the car powered on is perhaps what makes the problem hard to solve. They cannot disabled one part of the CAN without turning off the entire system.
The risk is the device being plugged in catching fire and no one being there to notice it smoking initially. Nothing to do with the car's wiring.
I run 12v directly from the main battery to run my fridge, so i can confirm that, yes, it stays engaged.
When you say the main battery do you mean the high voltage or the 12 volt battery. I would assume that you're pulling 12 volts from the 12-volt battery.
I'm taking 12v off the HV battery under the back seat, not the 12v battery up front.
10 bucks a month, on just the electricity?
Yes, sentry uses a lot of power.
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