bda0009
Posts: 3
Joined: Thu Apr 27, 2017 12:30 pm
Location: Honolulu, Hawaii

2012 Leeaf - Need help with some data

Tue Mar 06, 2018 11:11 am

I need help interpreting some data.

I bought a used 2012 Leaf in June 2017 with 40k miles, but the battery had been replaced in December 2016 by the dealer at 35k. It now has 44k miles and still 12 bars. My normal driving consists of take a series of short trips, like 5 miles to work, but also includes a steep hill to get home. Tires are at 40 psi and I drive very conservatively. I was charging overnight at home with 110 current, but recently am able to charge at work with 220. It is warm here in Honolulu, but relatively cool where I live, and where I park during the day is covered parking, so temperatures in the 70s and 80s.

According to my LeafSpy, the SOH is 91.43% and Hx is 79.31%. Are these numbers unusual with a relatively new battery? I knew I would lose some % each year, but that is almost 9% over a year and a quarter, and with the newer, upgraded battery type (I think/hope). Does battery degradation accelerate, or what can I expect?
My other question is that according to the dash instruments, I get 4.5 Miles/KWh. But when I do this calculation myself I get a lower number, like 14 KWh having driven 56 miles or 3.9 miles/KWh. Should those 2 numbers be closer?

I really like the car, but it feels like I am charging more often that I should. After a full charge it says around 100 miles, but 56 miles later I am at 3 bars.

Thanks for any feedback.

LeftieBiker
Posts: 8770
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 2012 Leeaf - Need help with some data

Tue Mar 06, 2018 1:26 pm

How many miles are you driving per day? If you can charge every other day, that may help. It's not unusual for there to be a drop in SOH while fairly new, but your battery should be a "Lizard" pack, and should do a little better. Is it already Hot there?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

bda0009
Posts: 3
Joined: Thu Apr 27, 2017 12:30 pm
Location: Honolulu, Hawaii

Re: 2012 Leeaf - Need help with some data

Tue Mar 06, 2018 4:14 pm

I probably average about 15 miles per day, charge 2 or 3 times per week. When I charged at home I was charging to 80%, but then I read that the 220 current was better on the battery and it was a good thing to go to 100%. That seems to help a little, but my main concern is that I have an effective range of 60 miles now with a pretty new battery and what I thought would be useful for 5+years is looking like a lot less time. Temperatures in the 70s and 80s – warm but I would not say hot.

LeftieBiker
Posts: 8770
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 2012 Leeaf - Need help with some data

Tue Mar 06, 2018 5:34 pm

If the nights stay warm that's the likely problem: the pack stays too warm. Charging to 80% is better; just do 100% as needed to keep the pack balanced. 120 volt charging is fine. There might be a little more cumulative heat from it, or there might not - the jury is still out on that. I don't suppose you have a garage that you could cool to 65F or so at night...?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

GerryAZ
Gold Member
Posts: 1694
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: 2012 Leeaf - Need help with some data

Tue Mar 06, 2018 9:01 pm

Several things to consider:

1. What tires do you have? The tires have likely been replaced since the car has 44k miles. Range will be reduced with any tires other than Bridgestone Ecopias inflated to 44 psi. How much depends upon the tires and inflation pressure.

2. It is normal for the miles/kWh display in 2011 and 2012 models to indicate much higher than actual efficiency. I measure charging power from the wall with a revenue accuracy meter ahead of my AeroVironment L2 EVSE (30 amperes output). The 2011 would routinely display 4.0 miles/kWh with my typical driving, but calculated wall-to-wheels efficiency would be about 3.0 mi/kWh with L2 charging and even lower with L1 (120-volt) charging. The miles/kWh display on the 2015 is more accurate.

3. I think your battery is doing fine and will last a long time with your daily driving needs. The difference between the LEAF Spy numbers for SOH and Hx indicate to me that you do have a "Lizard" battery. The numbers were closer to the same as the older chemistry cells deteriorated. The first bar dropped on my 2011 at about 13 months for both the original battery and the replacement (original chemistry from Japan). The second bar dropped about a month later on the original battery, but the car met its demise before the second bar dropped on the replacement. It was almost 2 years when the first bar dropped on my 2015 and a year after that when the second bar dropped. According to information read from the CAN Bus via LEAF Spy and other tools, the 2015 battery has more remaining capacity after 37 months and 57,000 miles than the 2011 had after 15 months and 14,500 miles when the data was read the morning of the Phoenix Range Test (September 15, 2012--car identified as Silver 679). The lower LEAF Spy numbers you see compared to what others post is likely due to your gentle driving and slow charging. The LEAF Spy numbers on my 2015 drop if I drive gently on surface streets and charge at lower current. The numbers increase back to where they were when I return to my normal driving pattern. The numbers also increase for a while after quick charging from very low battery warning (VLBW) to full.

4. The 2011 and 2012 models have some nice features that are missing on the later cars (adjustable headlights, electric parking brake, non-leather interior on SL, etc.). Enjoy your car and don't worry too much about your battery.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

powersurge
Posts: 971
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: 2012 Leeaf - Need help with some data

Wed Mar 07, 2018 5:51 am

Overall, don't worry.

You got the new battery almost 1 1/2 years ago. That replacement battery may have been in storage for one, or two years.... While holding its charge. So, 91% SOH is within reason, and will stay strong for a long time. I don't think that you had 100% SOH when the battery was installed... That would have been the time to complain.

Also, why do you need more precise measurements of how many miles per kilowatt you are getting than by using the dash display? Your other calculations will never be exact... And it really don't matter... 4.5 miles per kilowatt is great..

Relax
Don't worry
Be happy

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