Herm
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Re: Open Letter from Nissan, September 22, 2012

Fri Oct 05, 2012 4:00 pm

scottf200 wrote: There has never been any proof or anything from GM that they ARE using any of that 35% as the battery degrades. If you have seen that then please provide the links!
It was an old article by a GM exec back before the Volt was released.. that they would use the buffer to meet the 40 mile range spec as the battery aged. I have no idea if any Phoenix Volts have experienced degradation.. How could you tell by monitoring the kWh used during charging?.. the battery (unlike the Leaf) is never fully cycled.

scottf200
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Re: Open Letter from Nissan, September 22, 2012

Fri Oct 05, 2012 4:03 pm

Herm wrote:
scottf200 wrote:There has never been any proof or anything from GM that they ARE using any of that 35% as the battery degrades. If you have seen that then please provide the links!
It was an old article by a GM exec back before the Volt was released.. that they would use the buffer to meet the 40 mile range spec as the battery aged.
I don't think there has been any recent GM comments/presentations/etc and we are on the 3rd model year. 2013's went from 16 to 16.5kWh via chemistry tweaks and they use that 0.5 for more EV miles. Hence the 38 EPA rating vs 35. My 2011 has still gotten 45 miles + for the last 2 summers.
I have no idea if any Phoenix Volts have experienced degradation.. How could you tell by monitoring the kWh used during charging?.. the battery (unlike the Leaf) is never fully cycled.
I believe he watches his range as well as what goes in the car and both are consistent.

What about this? -->
DrI's watching of the SOC via the PID does not show any degradation.
http://www.mynissanleaf.com/viewtopic.p ... 99#p232799" onclick="window.open(this.href);return false;

What does the LEAF do with the 12.5% (100-87.5%)?
Last edited by scottf200 on Fri Oct 05, 2012 9:14 pm, edited 4 times in total.
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TonyWilliams
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Re: Open Letter from Nissan, September 22, 2012

Fri Oct 05, 2012 4:09 pm

scottf200 wrote:
Herm wrote:The Volt's battery has as 40% reserve buffer that is never used, to extend battery life.. for all we know there may be Volts in Phoenix that have already lost some of that, yet the "usable kWh" display remains the same. My guess is that it will be a few years until that buffer is gone.
The Volt's SOC range is generally from 22% to 87% so 65% used. It can dip into the teens. (LEAF has 21kWh usage out of 24kWh so ~87.5%).
Actually, LEAF stores 22.48kwh out of 24kWh advertised, and doesn't use the bottom 0.5kWh.

With losses, meter inaccuracies, etc, we typical see 21kWh useable at the wheels.

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davewill
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Re: Open Letter from Nissan, September 22, 2012

Fri Oct 05, 2012 5:09 pm

Pipcecil wrote:BUT I don't accept the inequality. Take a regular ICE car (like a Nissan Versa). Lets say the average life of the engine is 100,000 miles. If I drive 20,000 miles a year the engine only last 5 years, but that is my fault for driving so much. If someone else drives 10,000 a year it last 10 years. It doesn't matter if that person lives in Seattle, Phoenix, Dallas, New York, or Tampa Bay. If I drive 10,000 a year it will have about equal wear where ever I live.

But the leaf is different. 20,000 miles in Seattle does NOT equal 20,000 miles in Phoenix. ...!
I don't think that's true even for the ICE car. I'd expect the local climate to factor into the life of the car. Maybe not to the extent we're seeing, but it would definitely be a factor.
QueenBee wrote:...His logic is flawed though since the length of the lease does not cover the life of the vehicle so while Nissan takes the initial burden once the lease is over either the original owner who buys the car or the next owner take on the rest of the risk. For Nissan to actually take on the risk of battery capacity they need to offer a real capacity warranty. ...
If the car is turned back in, the market should take battery health into consideration. I certainly wouldn't pay top dollar for an off-lease LEAF that has two battery bars missing.
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Herm
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Re: Open Letter from Nissan, September 22, 2012

Fri Oct 05, 2012 6:46 pm

scottf200 wrote:]I believe he watches his range as well as what goes in the car and both are consistent.
What about this? -->
DrI's watching of the SOC via the PID does not show any degradation.
http://www.mynissanleaf.com/viewtopic.p ... 99#p232799" onclick="window.open(this.href);return false;
Ahh, I stand corrected.. the Volt does have a GID meter.

leafkabob
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Re: Open Letter from Nissan, September 22, 2012

Sat Oct 06, 2012 6:36 am

Here is a question that I would like for Hawk/Jeff Kuhlman to answer:
Is Nissan planning on releasing (or has it released) the Leaf in Dubai? If so, when? If so, will it have a liquid cooled BMS?
Thank you.
Kelly

2011 White SL-e (sold back to Nissan on 01/10/2013)
2011Silver SL with new lizard battery purchased used on 9/9/2015
2018 Tesla Model 3 received 4/27/2018

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TonyWilliams
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Re: Open Letter from Nissan, September 22, 2012

Sat Oct 06, 2012 9:39 am

leafkabob wrote:Here is a question that I would like for Hawk/Jeff Kuhlman to answer:
Is Nissan planning on releasing (or has it released) the Leaf in Dubai? If so, when? If so, will it have a liquid cooled BMS?
Thank you.
Here are some average temperatures:

....................Dubai.....................................Phoenix........

May: avg high 100F avg low 76F......ave high: 95F, average low: 69F
Jun: avg high 103F avg low 81F..... ave high: 104F, average low: 78F
July: avg high 105F avg low 86F.....ave high: 106F, average low: 83F
Aug: avg high 106F avg low 86F.....ave high: 104F, average low: 83F
Sept: avg high 102F avg low 81F.....ave high: 100F, average low: 77F

scottf200
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Re: Open Letter from Nissan, September 22, 2012

Sat Oct 06, 2012 10:41 am

TonyWilliams wrote:Here are some average temperatures:

Code: Select all

...............Dubai...........|...............Phoenix............| Dubai-Phoenix 
May: avg high 100F avg low 76F | avg high:  95F, average low: 69F | avg diff +5
Jun: avg high 103F avg low 81F | avg high: 104F, average low: 78F | avg diff -1
Jul: avg high 105F avg low 86F | avg high: 106F, average low: 83F | avg diff -1
Aug: avg high 106F avg low 86F | avg high: 104F, average low: 83F | avg diff +2
Sep: avg high 102F avg low 81F | avg high: 100F, average low: 77F | avg diff +2
Those are ridiculously close. [use code to force monospace font and added avg diff col]
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TonyWilliams
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Re: Open Letter from Nissan, September 22, 2012

Sat Oct 06, 2012 11:37 am

scottf200 wrote:
TonyWilliams wrote:Here are some average temperatures:

Code: Select all

...............Dubai...........|...............Phoenix............| Dubai-Phoenix 
May: avg high 100F avg low 76F | avg high:  95F, average low: 69F | avg diff +5
Jun: avg high 103F avg low 81F | avg high: 104F, average low: 78F | avg diff -1
Jul: avg high 105F avg low 86F | avg high: 106F, average low: 83F | avg diff -1
Aug: avg high 106F avg low 86F | avg high: 104F, average low: 83F | avg diff +2
Sep: avg high 102F avg low 81F | avg high: 100F, average low: 77F | avg diff +2
Those are ridiculously close. [use code to force monospace font and added avg diff col]
It makes some of these statements seem odd:

Mark Perry, Director of Product Planning for Nissan North America. On August 3, 2012, he was reported to have said, "We've also been very transparent in making sure people know that battery capacity will degrade in very high heat – for instance, if the cars sit out in 110-degree heat for five hours a day." He was also quoted as saying sometime before January 25, 2010, "We don't need thermal management for the U.S., but we are looking at the technology for Dubai and other locations like that.... We've gone on the record saying that the pack has a 70 to 80 percent capacity after 10 years."

leafkabob
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Re: Open Letter from Nissan, September 22, 2012

Sat Oct 06, 2012 1:23 pm

TonyWilliams wrote:
scottf200 wrote:
TonyWilliams wrote:Here are some average temperatures:

Code: Select all

...............Dubai...........|...............Phoenix............| Dubai-Phoenix 
May: avg high 100F avg low 76F | avg high:  95F, average low: 69F | avg diff +5
Jun: avg high 103F avg low 81F | avg high: 104F, average low: 78F | avg diff -1
Jul: avg high 105F avg low 86F | avg high: 106F, average low: 83F | avg diff -1
Aug: avg high 106F avg low 86F | avg high: 104F, average low: 83F | avg diff +2
Sep: avg high 102F avg low 81F | avg high: 100F, average low: 77F | avg diff +2
Those are ridiculously close. [use code to force monospace font and added avg diff col]
It makes some of these statements seem odd:

Mark Perry, Director of Product Planning for Nissan North America. On August 3, 2012, he was reported to have said, "We've also been very transparent in making sure people know that battery capacity will degrade in very high heat – for instance, if the cars sit out in 110-degree heat for five hours a day." He was also quoted as saying sometime before January 25, 2010, "We don't need thermal management for the U.S., but we are looking at the technology for Dubai and other locations like that.... We've gone on the record saying that the pack has a 70 to 80 percent capacity after 10 years."
Thanks for the info, but I was already aware of that. I really want to know if Nissan plans to introduce the Leaf to Dubai. Here is a link to an article from the Gulf Coast:
http://www.drivearabia.com/news/2012/07 ... e-to-heat/
We already know that both the Nissan Leaf and the Chevrolet Volt are being hot-weather tested right here in Dubai. Both cars will likely require extensive cooling mods before they can be launched in the GCC.
I recently heard a rumor that the Leaf was going to be rolled out in Dubai, so I would like for Jeff to respond to my question.

I want a Dubai car. ;)
Kelly

2011 White SL-e (sold back to Nissan on 01/10/2013)
2011Silver SL with new lizard battery purchased used on 9/9/2015
2018 Tesla Model 3 received 4/27/2018

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