Nissan's explanation of Leaf Battery Capacity Loss

[Rush Dougherty]

John Volker, an EV industry maven has written an article -
http://www.greencarreports.com/news/1079343_nissan-suggests-leaf-battery-cap
acity-loss-due-to-high-miles-exclusive
about Nissan's explanation about why some Leaf's have experienced more than
normal battery capacity loss.

Nissan basically says that  -" The common thread among the seven Leafs from
Arizona, Perry said, was that all of them had covered much higher mileage
than the 12,500 miles Nissan used to estimate the rate of battery capacity
loss over time. All of them had covered at least 50 percent more than
that--or roughly 19,000 miles a year--and a few were 'significantly higher'
than that."

"Those projections, based on battery testing during development of the Leaf,
assume the car covers 12,500 miles a year, in climates largely similar to
those of Los Angeles (50 to 90 degrees F, with an average temperature of 68
or 70 degrees)."

And so, according to Nissan,  " it appears that Leafs in Arizona are 'on a
glide path' to average battery capacity of 76 percent after five years
rather than 80 percent." And are well within the specs Nissan originally
laid out.

So again it comes down to heat. and how heat affects the battery life. I
guess also the cooling in the Arizona Leaf's is not enough to keep the
battery capacity in sync with the rest of the USA.

But I think that we that live in AZ knew that.

Rush
www.TucsonEV.com



 

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[Willie McKemie-2]

On Sun, Sep 23, 2012 at 07:44:06PM -0700, Rush Dougherty wrote:

> So again it comes down to heat. and how heat affects the battery life. I
> guess also the cooling in the Arizona Leaf's is not enough to keep the
> battery capacity in sync with the rest of the USA.

I have 20% capacity loss in Texas with 18K miles over 15 months.  That
is very close to Nissan's mileage expectations.  Another 10% drop in
capacity and my Leaf will be of almost no use to me; that will likely
be within a year.  So, expected battery life of 2-3 years?

Nissan has been and continues blowing smoke.

My Hyundai conversion has 34K miles over 3+ years and has no more than
10% capacity loss.  Nissan made a poor choice on battery chemistry
and/or battery management.  They should correct the problem.

--
Willie, ONWARD!  Through the fog!
http://counter.li.org Linux registered user #228836 since 1995
Debian3.1/GNU/Linux system uptime  68 days 22 hours 49 minutes

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[damon henry]

Welcome to the Beta program :)

Unfortunately this is how it goes when you are so excited to try out the new technology.  It will be interesting to see how Nissan handles it.  I bought a 2001 Honda Insight when it was brand new.  That was the second model year.  Honda updated their battery warranty several times over the first couple of years, but the first people with battery problems really had to try to work the system and got different results.  My initial pack lasted 10 years and 170k miles.  By that time enough community knowledge and spare parts were available that I replaced it myself for $400.

damon

> Date: Mon, 24 Sep 2012 09:37:09 -0500
> From: [hidden email]
> To: [hidden email]
> Subject: Re: [EVDL] Nissan's explanation of Leaf Battery Capacity Loss
>
> On Sun, Sep 23, 2012 at 07:44:06PM -0700, Rush Dougherty wrote:
>
> > So again it comes down to heat. and how heat affects the battery life. I
> > guess also the cooling in the Arizona Leaf's is not enough to keep the
> > battery capacity in sync with the rest of the USA.
>
> I have 20% capacity loss in Texas with 18K miles over 15 months.  That
> is very close to Nissan's mileage expectations.  Another 10% drop in
> capacity and my Leaf will be of almost no use to me; that will likely
> be within a year.  So, expected battery life of 2-3 years?
>
> Nissan has been and continues blowing smoke.
>
> My Hyundai conversion has 34K miles over 3+ years and has no more than
> 10% capacity loss.  Nissan made a poor choice on battery chemistry
> and/or battery management.  They should correct the problem.
>
> --
> Willie, ONWARD!  Through the fog!
> http://counter.li.org Linux registered user #228836 since 1995
> Debian3.1/GNU/Linux system uptime  68 days 22 hours 49 minutes
>
> _______________________________________________
> | Moratorium on drag racing discussion is in effect.
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