Car (motor) doesn’t have to move to put a “holding” current through it. I suspect they could put plenty. Looks like it can generate at least 3000 watts.
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Too cold to start
- Thread starter bijan
- Start date
Car (motor) doesn’t have to move to put a “holding” current through it. I suspect they could put plenty. Looks like it can generate at least 3000 watts.
Just got a message saying battery is heating. Power will improve as you drive.
https://photos.app.goo.gl/Hn6M2fbGk1d8WpNj7
https://photos.app.goo.gl/Hn6M2fbGk1d8WpNj7
Just got a message saying battery is heating. Power will improve as you drive.
https://photos.app.goo.gl/Hn6M2fbGk1d8WpNj7
Thanks for posting. If you check the app, do you see the battery heater icon? (Looks like a small battery with a red snowflake in the middle of it.)
Didn't check the app. Will check next time it's cold. Do I have to have the charger plugged in to get that icon? As this battery heater message on the touchscreen was while driving.
It should start heating when it’s that cold and plugged in. You can also check the app while driving and view the climate control screen.
1Step2NoGas
Member
Apologies for replying to my own post from Sat Jan 19. Trying for continuity and ease of information flow
Update:
Charged to 90% (confirmed on app) on Sat Jan 19, unplugged ~10:30pm, ~1 hr after app reported charging was complete
Left M3 unplugged outside, undisturbed, for 4 nights + 3 days (each day: -23ºC overnight low, -19ºC daytime high)
Did not check status in Tesla app nor opened car door anytime between unplugging on Sat eve and today
I do not have any 3rd party apps running (that poll the car to gather stats)
Checked app this morning at ~9:15am (outside temp -6ºC)
76% battery (snowflake icon) on app
I'm pretty impressed by this result. I imagined a 10% loss/day given the cold temps and expected to see the car showing less than 60% this morning.
No updates/changes on Leaf information as we were using that car while conducting this experiment on the Model 3. We charged the Leaf to 100% each night.
Also did you check the rated km left? With snowflake icon the percentage and rated km don't always line up. That is you'd expect 76% to be 379km normally but it was probably less km.
1Step2NoGas
Member
I didn't check the km (but will later today).
I may be wrong, but my understanding is that the battery percentage displayed on the screen & app is actual. As in there's 76% charge left in the battery.
How many kms/miles you/I can get from that 76% may depend on quite a few factors. Therefore, as a metric, I was trying to get something that would apply more universally rather than the kms that I could get out of that 76% given the road conditions, rims, tires, tire inflation, air temperature/density, cabin temperature, seat heater(s), battery temperature, driving habits, etc.
I realize that the bottom line is how far can one go on that 76% and I'm not taking anything away from the validity of that goal. But my 300kms may not be your 300kms.
My hope is that my observed 76% would be close to anyone's 76% given same starting SoC + chilling temps + duration.
When it's not cold the km is essentially percentage times 499km (I charge to 90% and km is always between 445km and 449km). Or almost exactly that (off by a few digits), it's not an estimate but almost the same as percentage but in terms of that times EPA range. With the snowflake it is percentage times 499km minus whatever is not available due to the cold (which can be several tens of km not available).
Like last night I had 245 and 50% when I got home, 236km and 49% when the car went to sleep 2 hours later, and 49% and 221km when I left for work this morning.
Lon12
Member
I have not seen that message yet. Thanks for showing us. Now all we need is an actual battery temperature reading somewhere....Just got a message saying battery is heating. Power will improve as you drive.
https://photos.app.goo.gl/Hn6M2fbGk1d8WpNj7
I've only had it happen when cold soaked / parked outside overnight at -15C or colder.
Would be nice to see battery temperature though.
iMoe
Member
Thank you all for the informative feedback.
Here is a relevant Jalopnk article covering Munro's findings when they took apart a Model 3. Specifically it is detailing the 'superbottle' but has 2 diagrams about heat control in the 3.
Relevant paragraph quoted below:
Here is a relevant Jalopnk article covering Munro's findings when they took apart a Model 3. Specifically it is detailing the 'superbottle' but has 2 diagrams about heat control in the 3.
Relevant paragraph quoted below:
Per the diagram below, when the batteries need to be warmed up instead of cooled down, you can see that coolant gets pumped to the management module and then into an oil-to-coolant heat exchanger in the drive unit to pick up heat, before being diverted away from the radiator via the integrated valve and sent directly through the chiller (which I assume is off in this case) to warm up the batteries.
Munro says Tesla actually “stalls” the drive motor to intentionally use its heat to warm up the batteries—a novel solution that forgoes the need for an electric resistance heater.
https://jalopnik.com/the-tesla-model-3s-superbottle-easter-egg-is-a-fascin-1830992728Munro says Tesla actually “stalls” the drive motor to intentionally use its heat to warm up the batteries—a novel solution that forgoes the need for an electric resistance heater.
Here are some screen shots of the car actively heating the battery this evening while plugged in and not charging.
Note the consumption of about 2.5 kW. Also note that the displayed state of charge increases as the battery warms up even though it isn’t charging.
