Limited regen

[ajroxstar]

I’ve noticed limited regen even on high. My regen bar is dotted on the left side. See pic. The weather has been colder here so not sure if battery temp related. But regen is limited to solid portion of the bar and fuel efficiency lower. Anyone else see the dotted portion of the regen bar on their displays? Wondering if a batter my issue I need to get checked out at KOP service center.

 

[idiot900]

Same here. My car was just at the KOP service center for the sound system tape fix and they did not mention anything about it to me. I believe it's related to the cooler temperatures we've been having.

 

[Halodde]

I feel like they changed something from last year/winter. I drove my car all last winter in upstate NY weather and not once did I notice a reduction in regen due to cold weather. Now, this year, it is definitely noticeable (and clearly stated) that the regen is limited in colder weather. I won't pretend to understand the reasons *why* regen has to be limited in cold weather. But it clearly is.

Same with the regen at higher SOC. It seems to me that it only used to be limited at 90% SOC or higher last year. But now, it's limited at lower SOC's.

Anyone know what changed or why?

 

[idiot900]

Regen is fundamentally limited in colder weather because the kinetics of the chemical reactions occurring in the battery are temperature dependent. The battery chemically cannot accept the generated energy fast enough. (Caveat: I am not a battery chemist)

The dots in the display are relatively new, IIRC we didn't have that last winter, so perhaps it's more apparent now. We could speculate they decided to limit regen more aggressively at low temperature or high SOC in recent software updates in the interest of extending battery life.

 

[JeffB]

I have definitely notice the difference this winter more than in the past. I just completed a 1700 mile road trip and regen was noticeably less in the colder climate.

It would be nice to get some official word on this change.

 

[chris]

Yes, I noticed a huge change from last winter when this wasn't the case. Clearly something has changed. It's downright annoying IMHO.

 

[Halodde]

Regen is fundamentally limited in colder weather because the kinetics of the chemical reactions occurring in the battery are temperature dependent. The battery chemically cannot accept the generated energy fast enough. (Caveat: I am not a battery chemist)

The dots in the display are relatively new, IIRC we didn't have that last winter, so perhaps it's more apparent now. We could speculate they decided to limit regen more aggressively at low temperature or high SOC in recent software updates in the interest of extending battery life.

I'll admit that it's possible that the regen in colder temperatures did not change from last winter but I perceive it to be less this year because of the indication on the dashboard. I don't think that's the case but it is possible

 

[Halodde]

Yes, I noticed a huge change from last winter when this wasn't the case. Clearly something has changed. It's downright annoying IMHO.

I can understand why you might feel that way. To me it's not annoying though. I'm just trying to understand it so that I can make appropriate decisions on my driving. And if things change, I would like to know about them and potentially even why

 

[idiot900]

I can understand why you might feel that way. To me it's not annoying though. I'm just trying to understand it so that I can make appropriate decisions on my driving. And if things change, I would like to know about them and potentially even why

It does seem like my car warns me more about limited regen now than last year. It could be that regen was just as limited then but I didn't notice, but I certainly don't really know.

 

[Pragmatic]

I experienced several cases last year where I lost regen (even if some here doubted what I experienced). I operate with standard regen in Swift mode, so regen is set low when I drive. I like the new warning.
I've usually lost it after several miles driving down a fairly steep winding mountain road where I've begun my trip at the top, battery SOC is less than 60%, and temperatures are below 30F. After 10 or 15 curves where I've slowed from 40 to 15 (little power is used in between since the down pitch varies from 5% to 13%) I'll get no slowing from regen. Not a big deal but nicer now that I've been forewarned.
Just did the trip last week. I did not experience any loss of regen. In my case I've not noticed any change from last winter other than the warning.

 

[mraschko]

I experienced several cases last year where I lost regen (even if some here doubted what I experienced). I operate with standard regen in Swift mode, so regen is set low when I drive. I like the new warning.
I've usually lost it after several miles driving down a fairly steep winding mountain road where I've begun my trip at the top, battery SOC is less than 60%, and temperatures are below 30F. After 10 or 15 curves where I've slowed from 40 to 15 (little power is used in between since the down pitch varies from 5% to 13%) I'll get no slowing from regen. Not a big deal but nicer now that I've been forewarned.
Just did the trip last week. I did not experience any loss of regen. In my case I've not noticed any change from last winter other than the warning.

I have hit this, or something very much like it, last winter and again this winter. I've been going back and forth with service on it. It's not just regen is reduced, it is GONE. Kinda spooky when it happens.

Recent messages:

After careful review of the data with field service engineering, this looks like it might be temperature related. Not so much ambient temperature but the temperature of the battery and drive units. With what you described, it sounds like it is happening after the vehicle has been sitting for an extended period of time. Do you normally pre condition the vehicle prior to your drives? Has it been occurring on a more consistent basis recently now that the temperature has dropped significantly?

Would you be okay with trying preconditioning your vehicle for about a week to see if the issue persists? Please let us know at your earliest convenience, thank you!

and

What we were suggesting for preconditioning prior to your drive is either setting the cabin temperature from your Lucid app, while its still plugged in, about 15-20 minutes prior to your drive or going to the charging tab in the Lucid app and selecting “Precondition Battery”. Either method will work but setting the cabin temperature will also ensure your cabin is at the desired temperature prior to your drive.

I've tried setting the cabin temp the last two days. That's not conclusive on solving the regen going to zero, but I will say that today I didn't notice any significant decrease in regen performance whereas other recent colder days, even if regen hadn't gone to zero, there was a noticeable reduction.

 

[Blue Lectroid]

I have hit this, or something very much like it, last winter and again this winter. I've been going back and forth with service on it. It's not just regen is reduced, it is GONE. Kinda spooky when it happens.

Recent messages:


and



I've tried setting the cabin temp the last two days. That's not conclusive on solving the regen going to zero, but I will say that today I didn't notice any significant decrease in regen performance whereas other recent colder days, even if regen hadn't gone to zero, there was a noticeable reduction.

I have long preconditioned the cabin of my Tesla M3P on cold mornings as a matter of habit (and comfort). On the rare day that I am in a rush and forget to do it my range for that trip suffers rather significantly.

 

[chris]

Well it's a whopping 5 degrees here this morning in Chicago area so It'll be interesting to see how the car behaves today!

 

[Blue Lectroid]

Well it's a whopping 5 degrees here this morning in Chicago area so It'll be interesting to see how the car behaves today!

Try preconditioning for 15 min before venturing out. I think it will make a difference…

 

[Halodde]

I experienced several cases last year where I lost regen (even if some here doubted what I experienced). I operate with standard regen in Swift mode, so regen is set low when I drive. I like the new warning.
I've usually lost it after several miles driving down a fairly steep winding mountain road where I've begun my trip at the top, battery SOC is less than 60%, and temperatures are below 30F. After 10 or 15 curves where I've slowed from 40 to 15 (little power is used in between since the down pitch varies from 5% to 13%) I'll get no slowing from regen. Not a big deal but nicer now that I've been forewarned.
Just did the trip last week. I did not experience any loss of regen. In my case I've not noticed any change from last winter other than the warning.

Happened to me once but the regen just quit. Service was unable to give me a reason why. It did not appear to be temp or SOC related. All they told me was that the car behaved as it was supposed to to protect the battery.