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evnow
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Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

My Leaf Stats : Range vs Temperature

Sat Nov 05, 2011 3:07 pm

This is from all the data I've been logging over the past 8 months.

Range is calculated as 21.5 * Leaf m/kWh. Ofcourse the shape & correlation to temperature won't change if we use a different figure. Temperature comes from http://www.beautifulseattle.com" onclick="window.open(this.href);return false;.

Image

Data behind this.

Image
1st Leaf : 2/28/2011 to 5/6/2013
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Stanton
Posts: 2378
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
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Re: My Leaf Stats : Range vs Temperature

Sat Nov 05, 2011 4:17 pm

Very interesting; thanks for posting. I suspect I'm seeing the beginning of "range limiting temperature effects", and I'm curious how dramatic it will be in our mild environment (similar to yours).
2011 Blue Ocean SV w/OVMS
12v LiFePO4 battery w/Antigravity Battery Tracker
FIAMM 74100 horns/Wet Okole seat covers/Tor's heater mod/Dala's CAN-bridge
Lizard Pack (Rev E) installed @51 months/41k miles
40 kWh Pack (Gen2) installed @115 months/85k miles

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johnr
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Re: My Leaf Stats : Range vs Temperature

Sat Nov 05, 2011 9:21 pm

The big question is, is the climate control responsible for most of this? Or is the battery performance alone affected to such an extent by temperature?
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camasleaf
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Location: Camas, WA

Re: My Leaf Stats : Range vs Temperature

Sat Nov 05, 2011 9:46 pm

johnr wrote:The big question is, is the climate control responsible for most of this? Or is the battery performance alone affected to such an extent by temperature?
I believe that mostly is the climate control. My wife does 2-3 25 miles round trips a day and she preheats in the morning and if needed on the third trip in the evening. Her average dropped from around 4.7 and above to 4.6 and below (miles/kWh). We did not notice a big drop in the range.

In the weekends, we even tried longer round trips up to 80 miles, as now there are L2 chargers on the way back (if needed). My wife drives and I try keep the climate control from killing the range.
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LEAFfan
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Re: My Leaf Stats : Range vs Temperature

Sun Nov 06, 2011 12:07 am

johnr wrote:The big question is, is the climate control responsible for most of this? Or is the battery performance alone affected to such an extent by temperature?
For me, it is definitely the temp of the battery pack. I don't use the heater, but will use heated seat cushions soon. In the high heat during the summer, I still can get over 6+ without any problem, but I've noticed since our weather has turned cooler and my battery temp has dropped from six to five bars, my m/kW h has decreased to the high 5's. I've lost around .5.
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UhClem
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Re: My Leaf Stats : Range vs Temperature

Sun Nov 06, 2011 9:01 am

I've noticed this, too. I"ve been doing a ~60 mile round trip on weekends since I got my car in August. It's on 35mph to 50mph rural roads; in August I was getting 5.2 to 5.5 mi/kwh, in October, 4.6 to 4.8 mi/kwh. Yesterday, with the car showing 42 degrees, I got 4.5 mi/kwh.

Climate control has been off on these trips.

kmp647
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Re: My Leaf Stats : Range vs Temperature

Sun Nov 06, 2011 9:06 am

Makes you wonder why the pack heater on the newest Leaf cars doesnt gently warm the pack when its temp falls below say 50

small amount of energy and then better more consistent range

instead it does not activate til pack temps reach a range killing -4 F

why ?
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lukati
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Re: My Leaf Stats : Range vs Temperature

Sun Nov 06, 2011 9:13 am

Very interesting data! Does anyone have similar data going down below freezing? I gets pretty cold here in Chicago!

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Stanton
Posts: 2378
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Re: My Leaf Stats : Range vs Temperature

Sun Nov 06, 2011 9:44 am

kmp647 wrote:Makes you wonder why the pack heater on the newest Leaf cars doesnt gently warm the pack when its temp falls below say 50

small amount of energy and then better more consistent range

instead it does not activate til pack temps reach a range killing -4 F

why ?
Could be a couple of reasons:
1) We don't know HOW LONG the "heater" stays on even when it does kick in
2) There's substantial "self heating" in batteries when used

I'm sure Nissan did a lot of simulation/testing around temperature; we just don't know what the critical points are (other than -4 F).
2011 Blue Ocean SV w/OVMS
12v LiFePO4 battery w/Antigravity Battery Tracker
FIAMM 74100 horns/Wet Okole seat covers/Tor's heater mod/Dala's CAN-bridge
Lizard Pack (Rev E) installed @51 months/41k miles
40 kWh Pack (Gen2) installed @115 months/85k miles

Herm
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Re: My Leaf Stats : Range vs Temperature

Sun Nov 06, 2011 11:17 am

There is nothing stopping the owner from adding an external battery heater, they are available all over the internet.

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