WiredForStereo
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What happened to my Regen?

Sat Oct 26, 2013 11:47 am

I recently had my car software updated and it seems that the regenerative breaking performance has been curtailed significantly. It can't seem to get more than 15-20 kW at the most even with the brakes full on and freeway speeds. Before, I could get the full 30 kW whenever prudent, but now it's just not doing it. Usually it won't go above 10 or 15 at all.

Any ideas? I thought it might be the temperature, but it worked last winter and it hasn't even gotten down to freezing yet. Also, I only charge to 80% so the battery is not full.

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mwalsh
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Re: What happened to my Regen?

Sat Oct 26, 2013 12:54 pm

Is this the P3227 update? If so, yes, it's a known and unwelcome artifact.
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TomT
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Re: What happened to my Regen?

Sat Oct 26, 2013 1:04 pm

It's also discussed in some detail in this thread: http://www.mynissanleaf.com/viewtopic.p ... &start=340" onclick="window.open(this.href);return false;
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DaveEV
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Re: What happened to my Regen?

Sat Oct 26, 2013 1:43 pm

Much more drastic than what most people have been reporting, but perhaps because it's colder where you are?

Make sure you complain to your dealer about it - perhaps the EV hotline, too. Appears that your LEAF is a 2012?

WiredForStereo
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Joined: Fri Sep 13, 2013 5:52 am
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Re: What happened to my Regen?

Sat Oct 26, 2013 2:36 pm

Thanks all for the replies.

It shouldn't be much colder here, as I said, hasn't even gotten to freezing yet and I've never seen the battery temp below 4 bars. It is a 2012. I was one of the fools who bought the car (at $6k off the sticker price) the day before the 2013 info came out at a lower price still.

I do pay much more attention to the power usage screen, almost never look at that bubble gauge on the instruments panel. I personally do not believe that the regen in the Leaf is adequate, even before the update. 30 kW out of an 80 kW motor is laughable. Any AC regen is practically capable of crashing the car if not controlled properly.

I am becoming a little disappointed with this car. There's no reason why it shouldn't work better all-around. I would pay dollars for a software kit that lets me pick the regen rate. I can't sell this car or trade it in, so it might as well do what I want warranty or no.

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planet4ever
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Re: What happened to my Regen?

Sat Oct 26, 2013 5:13 pm

WiredForStereo wrote:I personally do not believe that the regen in the Leaf is adequate, even before the update. 30 kW out of an 80 kW motor is laughable.
I think the problem from Nissan's perspective may be that putting 30 kW regen into a 24 kWh battery is a bit too close to the edge for a battery that has a history of degrading rapidly when it overheats. Nissan has put itself on the hook for batteries that degrade by more than 33% within 5 years/60K miles.

I rarely use QC, and then only enough to get myself home, but the impression I get from others is that the QC rate drops to less than 30 kW when the battery is more than half full. It sounds to me as if what you really find laughable is that an EV with an 80 kW motor has only a 24 kWh battery, or a battery that isn't cooled.

Ray
End of April 2013: Traded my 2011 SL for a 2013 S with charge pkg.

TimLee
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Re: What happened to my Regen?

Sat Oct 26, 2013 7:37 pm

planet4ever wrote:... the impression I get from others is that the QC rate drops to less than 30 kW when the battery is more than half full. ...
Ray
I don't think the fall off is quite that severe, but I'll have to check several instances to see how it compares to my pre-P3227 software change original regeneration. It does vary with battery temperature. The DCQC current reduction may curtail a bit faster than the original regeneration. Not an unreasonable speculation that the P3227 may have made the regeneration fall off match what is done for DCQC.

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camasleaf
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Re: What happened to my Regen?

Sun Oct 27, 2013 7:53 am

planet4ever wrote:... the impression I get from others is that the QC rate drops to less than 30 kW when the battery is more than half full. ...
Ray
The highest I have seen is 47kW at 52%, charge rate dropped quickly after 1 minute or 2. That was this summer in June 1st, warm day but the battery was not too hot. It was before the P3227, that we did last week.

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WiredForStereo
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Re: What happened to my Regen?

Mon Oct 28, 2013 7:34 am

planet4ever wrote:
WiredForStereo wrote:It sounds to me as if what you really find laughable is that an EV with an 80 kW motor has only a 24 kWh battery, or a battery that isn't cooled
Yes, those too. But I can deal with the battery. Tell me if I'm wrong, but there is no reason why it should not be able to regen at anything near the rate of the CHAdeMO plug in the front of the vehicle (62.5 kW?). Sure, take battery temperature and charge into account to regulate it (and whether or not you're in ECO mode, or give me an ECO2X mode) and any other setting you might want to apply. It should work better. This is what Li-ion batteries are supposed to be able to do. Nissan has been tiptoeing around this battery since the beginning. They made a mistake.

I'd be satisfied for now if it just went back to working how it did. I'd be ecstatic if it would work better.

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TomT
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Re: What happened to my Regen?

Mon Oct 28, 2013 8:01 am

I'm participating in a research project for the next month so I have the ability to directly compare regen over known routes. My car is a 2011 with P3227 and the research car I'm driving is a 2012 without P3227. Everything else being equal, I am consistently seeing about two bubbles (around 15Kw) less regen on my morning downhill run and under a number of other conditions. I am also seeing a reduction in the amount of regen bubbles available on the P3227 car as compared to the non-P3227 car under similar circumstances, and a wider range of conditions where regen bubbles are reduced... I wonder if this was intentional or an error induced as part of the P3227 update...

An interesting side note: The 2012 has about 12,500 miles on it, spent the summer in Phoenix, and has lost a capacity bar...
Last edited by TomT on Mon Oct 28, 2013 6:45 pm, edited 2 times in total.
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