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evnow
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Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

Re: Battery Design and Engineering Issues

Wed May 05, 2010 12:46 pm

Azrich wrote:Andy, I read in a Hawaiian online newspaper today that Nissan announced the LEAF would be introduced in 3 places soon after the first of the year 2011. They were : Hawaii, Raleigh, N.C., and Houston. I know that is still about 150 miles away from you, but the LEAF is getting closer!
Yes - I guess if it is sold within your state, it is easier to get it. You can always strike a deal with the dealership ... and don't have to worry about registration issues etc.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

LeafHopper
Posts: 41
Joined: Sat May 08, 2010 10:38 am
Delivery Date: 26 Jun 2015
Location: Phoenix, Arizona

Re: Battery Design and Engineering Issues

Sat May 08, 2010 1:34 pm

"Our Arizona "dry" heat will be a real test for the batteries and whether or not they will overheat. The heat radiating up from pavement on a 110 degree day can be 135 degrees. My car's thermometer has registered 135 degrees while driving slowly through a parking lot on a 112 degree day. Yikes."

I got a chance to drive the Leaf test vehicle in Phoenix. I spoke to two members of the design team and 3 members of the test team from Arizona. They have been testing the vehicle all over Arizona and their test track is on the west side of Phoenix near Sun City. They said that all of the cooling is conductive with no active cooling. When I asked about temperatures inside the battery, they replied that the temperature only rose 1 or 2 degrees above the ambient temperature. They did admit that the high temperatures reduced the mileage by 10 to 20%. They also said that they were doing tests in Japan's northern island of Hokkaido this last winter. So they have done an excellent job of testing performance under extreme environmental conditions.

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Azrich
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Delivery Date: 26 Jun 2015
Leaf Number: 000604
Location: Tucson, AZ

Re: Battery Design and Engineering Issues

Sat May 08, 2010 10:53 pm

I got a chance to drive the Leaf test vehicle in Phoenix.

LeafHopper, can you tell us somethings about your test drive. Acceleration ? Noise? Were you on a road or track where you could drive fast? Was the test vehicle one of the black and white versions with the old style headlights? What can you tell us?
Nissan LEAF - Blue Ocean SL-E
Reserved - April 20, 3:20 pm - Ordered - September 8, 2010 - Delivery: - March 22, 2011 - VIN: 604
EV Project Blink - installed March 17
5.8 kW PV system with 27 SunPower 215 W panels

LeafHopper
Posts: 41
Joined: Sat May 08, 2010 10:38 am
Delivery Date: 26 Jun 2015
Location: Phoenix, Arizona

Re: Battery Design and Engineering Issues

Sun May 09, 2010 12:12 pm

Acceleration ? Noise? Were you on a road or track where you could drive fast? Was the test vehicle one of the black and white versions with the old style headlights? What can you tell us?
Acceleration was very smooth and constant through the highest speed that I drove it, which was 40 mph. The test area was laid out in a parking lot so the track was not that big. The acceleration will not set you back in the seat, but it is perfectly adequate for entering a freeway with a short ramp.

The road feel is the best that I personally have ever felt. The low center of gravity makes the vehicle very stable. Turning was effortless and precise. Braking was smooth, but I did not do any hard stops.

The test vehicle was not a black and white version. It was the one that traveled with the tour. It is shown in the following video:

http://www.youtube.com/watch?v=cby8cHHS ... r_embedded

This video is an excellent way of experiencing the noise. I do not remember hearing any noise except for the tire noise. No motor or wind noise during my test. And I also rode in the back seat on 2 other test drives. So I was in the vehicle a total of 4 trips around the track. I hate noise so much. It was a joy to be in a nearly silent car. Since this was a test car, it is impossible to judge how much noise insulation will be used in the production car.

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garygid
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Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: Battery Design and Engineering Issues

Thu May 13, 2010 8:04 am

In Hawaii, other than rooftops, are there large area of unproductive, relatively barren land?

Perhaps cover the southern slopes of the volcanoes and some mountains with PV panels?
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
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Solar PV: 33 x 225W -> 7 kW max AC
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evnow
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Re: Battery Design and Engineering Issues

Thu May 13, 2010 11:07 am

garygid wrote:In Hawaii, other than rooftops, are there large area of unproductive, relatively barren land?

Perhaps cover the southern slopes of the volcanoes and some mountains with PV panels?
There was a graphic I saw sometime back which listed the year by which they expect PV to be grid competetive. Hawaii is one place where without any subsidy PV is grid competetive !

And my place, western WA, where it will not be competetive in a looong time :(
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

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garygid
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Posts: 12465
Joined: Wed Apr 21, 2010 8:10 am
Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: Battery Design and Engineering Issues

Thu May 13, 2010 2:54 pm

With my PV installed, I now run th A/C more often, instead of feeling overly-hot.

So, it might not "pay", but there is positive payback.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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akohekohe
Posts: 111
Joined: Mon Jun 28, 2010 8:36 pm
Location: O'ahu

Re: Battery Design and Engineering Issues

Mon Jun 28, 2010 9:08 pm

KarenRei wrote:The downside to hawaii is that most of their electricity comes from burning oil ;) Of course, with a good PV system...
Well, that is my plan! My PV system is producing about a 150 kWh a month than I currently use and we have net metering here in Hawaii, not reverse metering, so the electric company is essentially getting that 150 kWhs for free. I don't really need a car (I bicycle pretty much everywhere) but I figured what WTH I got to do something with those 150 kWhs ... figure that gets me about 600 miles a month. That should be more than I actually drive.

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TimeHorse
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Delivery Date: 02 Nov 2011

Re: Battery Design and Engineering Issues

Tue Jun 29, 2010 5:46 am

Azrich wrote:Andy, I read in a Hawaiian online newspaper today that Nissan announced the LEAF would be introduced in 3 places soon after the first of the year 2011. They were : Hawaii, Raleigh, N.C., and Houston. I know that is still about 150 miles away from you, but the LEAF is getting closer!
:( So I could drive 6 hours West to pick up my LEAF in Tennessee or drive 6 hours South and pick up my LEAF in Raleigh! Bugger, can't we just set up a sales location in Washington, D.C. so I can drive my LEAF by the Capitol building and remind Congress that we need more EV subsidies?

Murphy's law dictates New York and New Jersey, who already have the Mini-E, will get it next, so my choice gets to be 6 Hours West, 6 Hours South or 6 Hours North. Then, what? Barbados?
RIP CO2 Fre, 27 months, 42,282 mi & 11 bars.
unAmerican Job & Nissan's Rapid Depreciation cost $20,000!
5 hours on the road daily w/o Charge at Work on 100%.

Long Live CO2 Fre, Maxed 2013 SL, 20,000 mi/yr lease.
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DaveinOlyWA
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Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Battery Design and Engineering Issues

Tue Jun 29, 2010 6:16 am

all this makes me wonder?? when is heat an issue the most?

when charging or discharging?

i thought it was when discharging. when the car is moving, air will be moving as well. if the pack is passive heat control, that would mean, heat exchangers, cooling fins, etc. seems to me that ventilation would be ample at all but parking lot speeds.
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 412 mi, 99.72% SOH
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