johnrhansen
Well-known member
Could it help things to charge the battery to the max a couple times to balance all the cells?
Wow, it is crazy that you only have 12kW of regen at nearly 80F battery temps.TickTock said:Here's the drive home on December 11, 2013. Pack Temperature was 26C and I never got more than 12kW regen. However, unlike the August return trip, I charged at work so am starting again with a full charge and ending at 49% SOC.
Very interesting thought. Here's a theory. Since the graphs clearly show the available regen is a function of power consumption (why it would do this is another question), maybe the reason I see the degradation of available regen at higher temperatures than others is because I am a wimp and turn on the heater if outside temperature drops below 60F. Maybe the extra 2kW drain is enough to trigger the regen constraint. I'll bundle up one of these cold days and see if doing my commute without the comfort of heat improves my available regen.JPWhite said:mksE55 said:Correct I have not had the Update. I am do to take the car in for the 2nd year service battery check, and likely will get the update. but this is a major change in regen. I was under the impression that it had to be really cold to affect regen. battery pack that day was 57 by the leaf spy program. after some driving and 4 bars showing on battery temp. I have not checked carwings but I will look into this. since my son is driving it more now , I am not sure how accurate that can be since he drives it differently than I ,and does really care about regen/battery driving distance.
I've seen significant reduction of regen (one bubble) with a 50F battery, though it was 25F outside. It makes we wonder if the LEAF is taking ambient temps into consideration as well or exclusively in deciding on the regen available.
Interesting, I interpret your graphs as showing available regen is a function of vehicle speed, not power consumption. It's quite possible that there is some damping effect, but when is limited, but I have never seen any real difference in available regen at the same speed.TickTock said:Very interesting thought. Here's a theory. Since the graphs clearly show the available regen is a function of power consumption (why it would do this is another question)
TickTock said:[trying to recombine threads]
Very interesting thought. Here's a theory. Since the graphs clearly show the available regen is a function of power consumption (why it would do this is another question), maybe the reason I see the degradation of available regen at higher temperatures than others is because I am a wimp and turn on the heater if outside temperature drops below 60F. Maybe the extra 2kW drain is enough to trigger the regen constraint. I'll bundle up one of these cold days and see if doing my commute without the comfort of heat improves my available regen.JPWhite said:...
I've seen significant reduction of regen (one bubble) with a 50F battery, though it was 25F outside. It makes we wonder if the LEAF is taking ambient temps into consideration as well or exclusively in deciding on the regen available.
The phenomenon comes into play well above freezing - absolutely zero chance of ice.edatoakrun said:TickTock said:[trying to recombine threads]
Very interesting thought. Here's a theory. Since the graphs clearly show the available regen is a function of power consumption (why it would do this is another question), maybe the reason I see the degradation of available regen at higher temperatures than others is because I am a wimp and turn on the heater if outside temperature drops below 60F. Maybe the extra 2kW drain is enough to trigger the regen constraint. I'll bundle up one of these cold days and see if doing my commute without the comfort of heat improves my available regen.JPWhite said:...
I've seen significant reduction of regen (one bubble) with a 50F battery, though it was 25F outside. It makes we wonder if the LEAF is taking ambient temps into consideration as well or exclusively in deciding on the regen available.
As I've posted over the last few winters on various threads, I believe there could be an additional limitation on regen (pre-update) variable with both higher speeds and lower ambient temperatures, possibly for safety reasons.
Think about the possible results from a LEAF driver in ECO instinctively taking their foot off the accelerator after they hit an ice patch while driving down a steep curve at 60 mph...
In previous winters at what were ~ equivalent battery temps, I seemed to see regen (in ECO) reduced most significantly only at higher speeds and lower ambient temperatures.
I did not battery temp info from the App in previous winters, and haven't had the chance to check yet this year due to the bizarre weather so far this Winter (~11 F to ~28 L/H temp range last week, and a ~45 to 65 F L/H yesterday) meaning I've only used "80%" charge on relatively warm days, and needed ~ "90%"+ for the ~60 mile trip with ~2000 ft descent/ascent on the very cold days.
TickTock said:...The phenomenon comes into play well above freezing - absolutely zero chance of ice.
Painfully so! Heading down our mountain, I sometimes have to stop and let the friction brakes cool off. That's if I'm trying to have a high enough SOC to make it back up the mountain without re-charging. It's better if I can descend at slow speeds, but traffic doesn't always permit that. If I head down with a lower SOC, then the regen is adequate to avoid excessive friction braking.drees said:If you were on a steep freeway slope (think Grapevine on I5 in So Cal) you'd be giving up a lot of energy. I imagine that dgpcolorado and abasile feels the effects of this quite frequently.
FairwoodRed said:I took my leaf to my dealer to have them look at lack of regen. The dealer wrote that it was a result of the LBC programming update. I opened a case with Nissan. While talking to Jason/Nissan about that, he said “I’ll call the dealer, I want to see if they are having a lot of customers with similar issues.”
He could have been buffaloing me, but he sounded sincere. Hasn’t everyone been reporting the lack of regen to Nissan? Shouldn’t they have dozens if not hundreds of case reports by now?
If you haven't reported it to Nissan, do it TODAY!
I've since had the Leaf in for 2nd annual battery inspection, with the comment that regen seems to be having problems. I expected that the P???? update would be installed (and was). The dealer found nothing unusual (as expected).brettcgb said:The missing double bubbles were what initially tipped me off that something might be happening... I had always seen 5 double bubbles for all SOC<80%, all temperatures. Suddenly, I was never getting more than 3. They didn't gradually go away - one night I had 5, the next morning I couldn't get more than 3. The energy display confirmed my fears.johnrhansen said:Let me ask this: during all these occurrences of limited regen, is it accompanied by a missing double circle around that green indicator dot? That's what happens on mine, but it only ocuurs with very low temperatures or very high soc. When it's not available the double circle goes away.
Enter your email address to join: