Discuss data from the LEAF Battery app, and Comparisons

[GregH]

1/21: AHr=51.38 Hlth=73.02%
2/25: AHr=51.37 Hlth=73%

lol.. If only we could get by in the summer months with 10mAh/month degradation..

 

[LEAFfan]

2/28/14-AH=54.6
G=238
G%=85%

So this is a 5% improvement for the 2013 BP vs. my 2011. Since I lost my first bar 2 months ago, I've been averaging 5.8 m/kW h which still gives me 100 miles of city range.

 

[mwalsh]

lol.. If only we could get by in the summer months with 10mAh/month degradation..

That may have had more to do with me barely needing the car most of February rather than the climate - I was furloughed from work from January 31st to February 25th, and didn't charge the car over 50% for the duration.

 

[mxp]

< cut >
Do you have the P3227 update? I haven't seen any changes in AHr, but then my battery temps might have reached 60F perhaps only a couple times this winter, 65F is more typical compared to 75F in the summer.

I'm still curious about how your AHr is higher than mine (and Jeremy's), but our Hx values are lower.

I wonder if this reflects a difference in usage patterns - you do a lot of freeway miles (more steady state discharges at 60-65 mph with more large cycles of the pack) while Jeremy and I appear to do more city miles (bursty discharge (20-40 kW) with more regen spikes for stop lights). Perhaps it's mainly the additional regen spikes that do it?

Has anyone tried collecting the various bits of data and comparing?

What does my data tell me about my battery condition? (2011 Leaf, without P3227 update nor any sw updates yet)
Thanks.

Mar 10, 2014
Moderate evening (58deg F): 5 temp bars showing.
Data below taken after a day's use and cooled, about 8pm, SOC = 59.17%:
58def F
AHr=56.05 Hlth=81.75%
59.17% SOC ? gids

Oct 25, 2013
Cold morning: 5 temp bars showing before driving.
Data below taken after 100% overnight charge, about 8am:
63def F
AHr=57.87 CAP=87.87%, Hlth= 85.33%
92.4% SOC 240 gids

June 28, 2013
Warm morning: 6 temp bars showing even before drive.
Data below taken after 100% overnight charge, about 8am:
80def F
AHr=58.84 CAP=88.81%
91.5% SOC 242 gids

 

[palmermd]

I can't remember and have not been able to search this thread since it is getting so large. So I'm sorry if this is a repeat question. Can the Leaf App (LeafSpy) read the data when connected to the EVCan as well as the CarCAN? Right now I have it connected to the car can, but I was going to rewire the bluetooth transmitter to the EVCan for other reasons and I was wondering if the LeafSpy will continue to work, or If I need to have a second Bluetooth transmitter for when I'm on the other CAN.

 

[mwalsh]

6/22: AHr=54.07 CAP=81.61%. Lost bar 12.
6/24: AHr=54.01 CAP=81.52%
6/25: AHr=54.12 CAP=81.68%
7/11: AHr=53.16 CAP=80.23%
7/12: AHr=53.30 CAP=80.45% Hlth=76.57%
8/26: AHr=52.54 CAP=79.30% Hlth=75.16%
9/11: AHr=51.49 CAP=78.49% Hlth=73.22%
10/2: AHr=51.81 CAP=78.98% Hlth=73.82%
10/8: AHr=51.58 CAP=78.63% Hlth=73.39%. Lost bar 11.
10/23: AHr=52.12 CAP=79.51% Hlth=74.46%
11/5: AHr=52.68 CAP=80.31% Hlth=75.43%
11/12: AHr=52.47 CAP=79.98% Hlth=74.80%
11/22: AHr=52.74 CAP=80.40% Hlth=75.53%
11/25: AHr=52.89 CAP=80.63% Hlth=75.81%
12/21: AHr=52.74 CAP=80.40% Hlth=75.53%
1/21: AHr=51.38 CAP=78.32% Hlth=73.02%
2/25: AHr=51.37 CAP=78.31% Hlth=73%

3/12: AHr=50.75 CAP=77.37% Hlth=71.86%

 

[Berlino]

Three rare events warmed the battery yesterday:

1) Outdoor temperature above freezing.
2) LEAF parked the night before in a heated garage.
3) 200 miles in one day.

This caused the AHr and Hx readings to move for the first time in a month. Fortunately, they went to the highest values I've seen in my vehicle.

 

[NYLEAF]

I saved some data from the BatLog to a Google Drive spreadsheet. This is from a QC session that I did on March 8th. I also included two lines of data from before I started the QC and two from after I ended it. I can't seem to figure out how much power (kW) the QC station was using, but the charge certainly seemed pretty fast to me. Can anyone do the math for me based on the info provided? Also, how's my battery doing? I haven't kept up with this thread too much so I'm not sure what to look for really. Thanks.

https://docs.google.com/spreadsheet/ccc?key=0AiSAy22m8bFJdHBaaDR3OWp2VlMzQThQZFZwdkNNeXc&usp=sharing

 

[gmikol]

Your car gained 102 GIDs (43 to 145) over the course of 15 minutes, if I read the spreadsheet correctly.

If we assume 1 GID = 80 Wh (I know, I know, it's probably less than that), then your gar gained 8160 Wh in 15 minutes.

8160 Wh / 0.25h = 32640 W (32.64 kW) average over that time period. The rate looks a litttle higher in the first couple of minutes.

BTW--With an Ahr reading of 66.0 at ~24000 miles, your battery is practically new, still.

--G

 

[ttweed]

I can't remember and have not been able to search this thread since it is getting so large. So I'm sorry if this is a repeat question. Can the Leaf App (LeafSpy) read the data when connected to the EVCan as well as the CarCAN? Right now I have it connected to the car can, but I was going to rewire the bluetooth transmitter to the EVCan for other reasons and I was wondering if the LeafSpy will continue to work, or If I need to have a second Bluetooth transmitter for when I'm on the other CAN.

IIRC, the early beta editions of the LBA (up to ver.26c, maybe?) worked with the EV-CAN bus, except that Gids could not be reported accurately because they were carried on the CAR-CAN bus. It even had a setting to choose EV vs. CAN. Later development took the app exclusively down the CAR route, so I'm not sure what the current Leaf Spy versions will do with the EV-CAN.

No need to convert yours though--I still have an ELM device wired for the EV bus I don't need if you want it--just PM me.

TT

 

[lorenfb]

My Data:

Vehicle - 2013 SL, Mileage - 3771, Production # - 416635, Date of Pur - 11/22/2013

GIDS - 263, Capacity - 20.3 kWH, SOC - 97%, SOH - 92%, Hx - 92.81%, AHr - 60.49
QCs - 21, L1/L2s - 110, Tire Pressure - 42psi, Average Range - 5.1-5.2miles/kWH
Driving Speed < 55-60mph, Vcell(nominal) - 4.12 volts

 

[Pipcecil]

I know it has been discussed before that Leaf Spy only outputs, at max ~95% SoC due to the reserved capacity that cannot be accessed. BUT does this mean that it is still reporting the 2% at the bottom and if I drive the car to dead, it will not drop below 2% SoC or will the car bottom out at 0% SoC on the Leaf Spy app?

 

[GregH]

The SOC is coming from the car itself.. When it tops out at 95% or 96% and doesn't go below 2% or 3% that's a number direct from the lithium battery controller on the car. It's NOT a calculated value by LeafSpy or LeafDD. The SOC displayed on the 2013/14 dashboard is (as has been discussed elsewhere) different. Personally I'd rather use the hard number from the LBC than a user friendly synthesized number that just shows 100 when full and goes to --- rather than display the last few percent.

Since the lowest cell drops like a rock in the last few Gids before turtle, hitting as low as 2.7 or 2.8V my guess is that reporting 2% is accurate... going down to 0% would kill your battery. On the top end the Leaf cells could be charged beyond the 4.12V as far as 4.2 or even 4.3V (which I did on the bench with a Leaf module) and that would take you up to about 102% or 103%... So I'm not sure what "100%" would represent. But for reasons of longevity Nissan decided that 4.12V was as high as they wanted to go and in their language that's about 96 or 97%

 

[kevinleaf]

The most I have seen in my MY2013 car is 284 GIDS at 96.7728 SOC
Most cells were at 4.1 volts.
I'm sure the dash said 100%

 

[Berlino]

I've had the average voltage over 4.13, with individual cells as high as 4.136. SOC: 97.3%, Max Gids 284, but voltage was always ~4.13, even at the beginning when I was between 263 and 276 Gids.

 

[mwalsh]

6/22: AHr=54.07 CAP=81.61%. Lost bar 12.
6/24: AHr=54.01 CAP=81.52%
6/25: AHr=54.12 CAP=81.68%
7/11: AHr=53.16 CAP=80.23%
7/12: AHr=53.30 CAP=80.45% Hlth=76.57%
8/26: AHr=52.54 CAP=79.30% Hlth=75.16%
9/11: AHr=51.49 CAP=78.49% Hlth=73.22%
10/2: AHr=51.81 CAP=78.98% Hlth=73.82%
10/8: AHr=51.58 CAP=78.63% Hlth=73.39%. Lost bar 11.
10/23: AHr=52.12 CAP=79.51% Hlth=74.46%
11/5: AHr=52.68 CAP=80.31% Hlth=75.43%
11/12: AHr=52.47 CAP=79.98% Hlth=74.80%
11/22: AHr=52.74 CAP=80.40% Hlth=75.53%
11/25: AHr=52.89 CAP=80.63% Hlth=75.81%
12/21: AHr=52.74 CAP=80.40% Hlth=75.53%
1/21: AHr=51.38 CAP=78.32% Hlth=73.02%
2/25: AHr=51.37 CAP=78.31% Hlth=73%
3/12: AHr=50.75 CAP=77.37% Hlth=71.86%

3/24: AHr=51.93 CAP=79.16% Hlth=72.36%

You can really tell the hit all the values take once the heat starts to kick in. Now our abnormal hot spell has been done for a while, things are on the up again.

 

[mwalsh]

6/22: AHr=54.07 CAP=81.61%. Mileage: 30,455 miles. Lost bar 12.
6/24: AHr=54.01 CAP=81.52%
6/25: AHr=54.12 CAP=81.68%
7/11: AHr=53.16 CAP=80.23%
7/12: AHr=53.30 CAP=80.45% Hlth=76.57%
8/26: AHr=52.54 CAP=79.30% Hlth=75.16%
9/11: AHr=51.49 CAP=78.49% Hlth=73.22%
10/2: AHr=51.81 CAP=78.98% Hlth=73.82%. Mileage: 34,507
10/8: AHr=51.58 CAP=78.63% Hlth=73.39%. Mileage: 34,813. Lost bar 11.
10/23: AHr=52.12 CAP=79.51% Hlth=74.46%. Mileage: 35,220
11/5: AHr=52.68 CAP=80.31% Hlth=75.43%. Mileage: 35,723
11/12: AHr=52.47 CAP=79.98% Hlth=74.80%. Mileage: 36,071
11/22: AHr=52.74 CAP=80.40% Hlth=75.53%. Mileage: 36,445
11/25: AHr=52.89 CAP=80.63% Hlth=75.81%. Mileage: 36,509
12/22: AHr=52.74 CAP=80.40% Hlth=75.53%. Mileage: 37,596
1/21: AHr=51.38 CAP=78.32% Hlth=73.02%. Mileage: 38,471
2/25: AHr=51.37 CAP=78.31% Hlth=73%
3/12: AHr=50.75 CAP=77.37% Hlth=71.86%
3/24: AHr=51.93 CAP=79.16% Hlth=72.36%. Mileage: 40,228

4/17: AHr=50.81 CAP=77.46% Hlth=71.97%. Mileage: 41,232

 

[essaunders]

I did (my wife, actually) did a 100% charge yesterday. So i got my first 'full' GID reading on my 2012 (13000 miles). 265Gids. I have a screenshot with AHr and CAP and Hlth that i'll update later.

 

[Pipcecil]

Ok a few questions I was unable to find (although this thread is long, so I could have missed it):

- My SOH value has always been whole numbers but other users (and older screen captures) have this value up to 2 decimal places. Is this something in the settings to change or was it a change in the a version of leaf spy (I have the pro version).

- Is the SOH number rounded or truncated? It can make a big different between the two since the data for the whole numbers could be shifted by 0.5 Ahr depending on what technique is used.

- How is SOH though the app calculated? In older versions (and on the wiki) it was stated the number was gotten from a percent of a full Ahr battery, set at 66.2556 which the user could change. This option to change has been removed and it is unclear now how SOH is being calculated. Is it the same? Does it use the same value (but cannot be changed) as it previously? I can't find a consistent Ahr value that is being used that would work with the truncated or rounding method 100% of the time (hence why I can't guess which is right). If it is divided by a fixed value, something else must be affecting it. I reached a bottom out Ahr value awhile back and had a 67% SOH display. After that we had a cold snap and my Ahr value raised significantly (about 0.5 in a couple of days) as my battery Ahr value dropped, I reached my previous low Ahr value, yet the app maintained a 68% SOH, it wasn't until I reached about 0.05 Ahr below the previous low reading that my SOH dropped back to 67%. This would indicated that the computation for SOH is not using a fixed value (although I thought it did).

Just curious. Also - 67% capacity - YEA only 0.75% left to go (assuming my gauge reads correctly and isn't optimistic - that would suck)

 

[lorenfb]

"How is SOH though the app calculated? In older versions (and on the wiki) it was stated the number was gotten from a percent of a full Ahr battery, set at 66.2556 which the user could change."

The GID values are data read from the LBC which relates to the battery capacity. It has been assumed
that the typical maximum battery capacity is 284 GIDs. From the 284 GID number and the value reported
by the LBC, the SOH is calculated. Since it's highly unlikely that all production Leaf batteries when installed
have the exact same initial capacity of 284 GIDs, the SOH of all new zero mileage Leafs will vary. Some
Leafs may initially actually have GIDs exceeding 284. One might expect that the distribution of production
battery capacities vary 2-3%. Additionally, one might expect that battery capacity may initially drop 2-3%
after its first operation of a hour and then stabilize to its long term capacity loss. The key point to be aware
of is the change in GIDs over time and as a function of temperature and not the initial GID value.

Here're my updated data after 1851 miles:

GIDS - 264, Capacity - 20.5 kWH, SOC - 97%, SOH - 94%, AHr - 60.92 QCs - 24, L1/L2s - 162

The data indicate that battery is basically unchanged after 1851 miles and is in its long term capacity
loss mode. The battery has always been charged to 100% with L1/L2.