The 40KWH Battery Topic

[Dala]

Very nice data here, my 2018 pack is still sitting at 95.x%SOH, and I'm extremely curios to see what the next incoming 2018 40kWh pack I ordered will sit at. It's really cold here :lol:

 

[EnigmaEV]

My question is what technique do you use to stop the charge at 70%?

I have been going to 100% then driving shortly there after but the last two times I caught it at 90% and stopped the charging. I want to charge to 80% from around 40%.

I set up a daily timer with an end time of 10:30 AM, a start time of 10:00 AM, and "full charge has priority" turned on. With these settings I can plug in the car at any state of charge the night before and it will automatically decide when it needs to start charging to be at 100% by 10:30. By 8:00, when I normally leave, the car is usually right around 80%. On the days I'm not heading out, I simply unplug it at 8:00 and it can sit for the day at a happy 80%. The times may need to be varied a bit based on temperature and depending on the type/amperage of the plug you are using. I use the EVSE that came with the car with the NEMA 14-50 plug on a 40A circuit. I use 15%/hour as a rough estimate if I need to calculate charge times rather than using the timer. Also, I do not have time of use billing so that is one less complication I need to worry about. Happy charging!

 

[GaleHawkins]

My question is what technique do you use to stop the charge at 70%?

I have been going to 100% then driving shortly there after but the last two times I caught it at 90% and stopped the charging. I want to charge to 80% from around 40%.

I set up a daily timer with an end time of 10:30 AM, a start time of 10:00 AM, and "full charge has priority" turned on. With these settings I can plug in the car at any state of charge the night before and it will automatically decide when it needs to start charging to be at 100% by 10:30. By 8:00, when I normally leave, the car is usually right around 80%. On the days I'm not heading out, I simply unplug it at 8:00 and it can sit for the day at a happy 80%. The times may need to be varied a bit based on temperature and depending on the type/amperage of the plug you are using. I use the EVSE that came with the car with the NEMA 14-50 plug on a 40A circuit. I use 15%/hour as a rough estimate if I need to calculate charge times rather than using the timer. Also, I do not have time of use billing so that is one less complication I need to worry about. Happy charging!

OK that sounds simple enough that I can do it. Some have complex math systems. After I lost the 4 bar and before I got the battery replaced under warranty I drove 50 miles to Walmart twice and did some DC charge cycles. They will get a battery serious hot and I never 'plan' to use one. If I do use a DC charge I plan just to add about 10 miles more than I need to get home if the temperature rise concerns me.

My 2016 came with the 120 volt EVSE so I bought an NEMA 14-50 40 amp EVSE that is on a 40 amp circuit but the max the 6.6 amp charger can draw is 26 amps.

Thanks

 

[lorenfb]

My question is what technique do you use to stop the charge at 70%?

I have been going to 100% then driving shortly there after but the last two times I caught it at 90% and stopped the charging. I want to charge to 80% from around 40%.

It's very simple with my 40 kWh Leaf:

1. In your case the additional capacity needed is 40%, or 16 kWh (.40 X 40), assumes 100% SOH.
2. My L2 EVSE results in about 5 kW of power added to the battery via the Leaf's inverter, i.e. checked over time.
3. So the timer is set to charge for about (16 kWh / 5 kW = 3.2 hr) 3 hr & 15 minutes.

Typically, the target capacity is within 2-3% of my goal at the end of the charging session.

 

[RicW]

Lately, I've been using this free Android app EV Charging Time Calculator:
https://play.google.com/store/apps/details?id=com.ev_charging_time_calculator.v_1

When I'm on a public charger or the chargers at work, I set a phone timer for about 10 minutes before the predicted time, then use Nissan Connect to check the charge level before heading out to unplug. You can fine tune it by adjusting the battery size in the app.

 

[LeftieBiker]

I did my (just short of) two year LeafSpy reading a few minutes ago. I'll post the details later, but the Spoiler is: 91.69% SOH. My Leaf seems to have finally stopped the rapid decline in SOH. Either that, or it still thinks it's Winter.

 

[DaveinOlyWA]

I did my (just short of) two year LeafSpy reading a few minutes ago. I'll post the details later, but the Spoiler is: 91.69% SOH. My Leaf seems to have finally stopped the rapid decline in SOH. Either that, or it still thinks it's Winter.

Is this the first sign of a significant slowdown in degradation? Mine all but stopped after 15 months?

 

[Learjet]

I have the 62 kWh battery...but to charge to 75% the other day....I just took the time to 75% from the dash read out...it was showing 3.5 hours....so I set the timer to charge from 3:00 am to 6:30 am...3.5 hours...and the car charged perfectly to 75%. Seems like easy way to calculate.

 

[DaveinOlyWA]

I have the 62 kWh battery...but to charge to 75% the other day....I just took the time to 75% from the dash read out...it was showing 3.5 hours....so I set the timer to charge from 3:00 am to 6:30 am...3.5 hours...and the car charged perfectly to 75%. Seems like easy way to calculate.

Your method requires adjusting the setting daily depending on your daily remaining SOC. The other method stated above is actually quite effective for the predominant "set it and forget it" crowd.

 

[danrjones]

I did my (just short of) two year LeafSpy reading a few minutes ago. I'll post the details later, but the Spoiler is: 91.69% SOH. My Leaf seems to have finally stopped the rapid decline in SOH. Either that, or it still thinks it's Winter.

Mine just keeps ticking down. As of this AM I'm at 90.18%. Also today for the first time this year the temp bar went above the middle. Sumner is here.

 

[danrjones]

I should add, I do it the same way as EnigmaEV. Set to full charge has priority. Departure time set several hours after I leave for work. I just dialed it in by adjusting that departure time until I was around 75 to 80% at the actual departure time.

 

[DaveinOlyWA]

I have the 62 kWh battery...but to charge to 75% the other day....I just took the time to 75% from the dash read out...it was showing 3.5 hours....so I set the timer to charge from 3:00 am to 6:30 am...3.5 hours...and the car charged perfectly to 75%. Seems like easy way to calculate.

Easy math; On the Plus, I gain just about 10% SOC for each hour of charge.

 

[danrjones]

Mine just keeps ticking down. As of this AM I'm at 90.18%. Also today for the first time this year the temp bar went above the middle. Sumner is here.

I know some of you don't think heat impacts the 2018s but as soon as it got hot, my SOH started dropping faster again.

This AM I'm at 90.15%. I'll drop into the 80s before I hit my next major adjustment. No sign of any increase others have had.

 

[DaveinOlyWA]

Mine just keeps ticking down. As of this AM I'm at 90.18%. Also today for the first time this year the temp bar went above the middle. Sumner is here.

I know some of you don't think heat impacts the 2018s but as soon as it got hot, my SOH started dropping faster again.

This AM I'm at 90.15%. I'll drop into the 80s before I hit my next major adjustment. No sign of any increase others have had.

define "fast"

 

[danrjones]

Mine just keeps ticking down. As of this AM I'm at 90.18%. Also today for the first time this year the temp bar went above the middle. Sumner is here.

I know some of you don't think heat impacts the 2018s but as soon as it got hot, my SOH started dropping faster again.

This AM I'm at 90.15%. I'll drop into the 80s before I hit my next major adjustment. No sign of any increase others have had.

define "fast"

Faster than it was during the winter.

During the winter it was dropping about 0.01 every 14 days, plus or minus. Not including the 3 month adjustment.
Now its dropped .01, four times, in a span of two weeks since its started to get hot outside.

In my book that's a lot faster, YMMV.

 

[DaveinOlyWA]

I know some of you don't think heat impacts the 2018s but as soon as it got hot, my SOH started dropping faster again.

This AM I'm at 90.15%. I'll drop into the 80s before I hit my next major adjustment. No sign of any increase others have had.

define "fast"

Faster than it was during the winter.

During the winter it was dropping about 0.01 every 14 days, plus or minus. Not including the 3 month adjustment.
Now its dropped .01, four times, in a span of two weeks since its started to get hot outside.

In my book that's a lot faster, YMMV.

ok so that is .08% per month? I think I could live with that.

I have to put myself on record as saying I am not on board with daily readings having any major significance and yeah, this is coming from someone who has recorded stats EVERY day my LEAFs have been driven for a few days short of 7 years.

 

[Marktm]

....Date.......SOH.......HX......AH.....Chg
03/09/2018 99.10 98.86 115.00
07/14/2018 97.13 111.58 112.13 -1.97
09/21/2018 96.15 111.74 111.00 -0.98
10/18/2018 94.91 112.07 109.56 -1.24
12/31/2018 94.77 111.47 109.40 -0.14
01/15/2019 93.69 111.75 108.16 -1.08
01/21/2019 92.21 111.97 106.45 -1.48
03/01/2019 92.14 112.26 106.37 -0.07
04/06/2019 92.09 112.27 106.31 -0.05
06/13/2019 91.34 113.00 105.44 -0.75
07/01/2019 91.25 113.66 105.34 -0.09
07/10/2019 91.20 113.80 105.28 -0.05
07/12/2019 91.67 113.83 105.83 +0.47
07/28/2019 91.60 114.00 105.74 -0.07
09/10/2019 91.40 113.57 105.51 -0.20
10/13/2019 91.92 113.52 106.11 +0.52
11/11/2019 91.86 111.66 106.04 -0.06
12/10/2019 91.84 111.83 106.02 -0.02
01/10/2020 91.80 112.26 105.97 -0.04
02/10/2020 91.77 112.07 105.94 -0.03
03/10/2020 91.74 112.16 105.90 -0.03
04/10/2020 92.12 111.46 106.34 +0.38

I plotted your amphour history and the difference in the "Lizard" (replacement) pack in my 2012 is stark ! I'm sure that your Atlanta climate vrs Houston has some influence, however, there is essentially no "repeat" of summer/winter swings is evident in your 40 amphour pack.

My 2012 plot:

 

[DaveinOlyWA]

....Date.......SOH.......HX......AH.....Chg
03/09/2018 99.10 98.86 115.00
07/14/2018 97.13 111.58 112.13 -1.97
09/21/2018 96.15 111.74 111.00 -0.98
10/18/2018 94.91 112.07 109.56 -1.24
12/31/2018 94.77 111.47 109.40 -0.14
01/15/2019 93.69 111.75 108.16 -1.08
01/21/2019 92.21 111.97 106.45 -1.48
03/01/2019 92.14 112.26 106.37 -0.07
04/06/2019 92.09 112.27 106.31 -0.05
06/13/2019 91.34 113.00 105.44 -0.75
07/01/2019 91.25 113.66 105.34 -0.09
07/10/2019 91.20 113.80 105.28 -0.05
07/12/2019 91.67 113.83 105.83 +0.47
07/28/2019 91.60 114.00 105.74 -0.07
09/10/2019 91.40 113.57 105.51 -0.20
10/13/2019 91.92 113.52 106.11 +0.52
11/11/2019 91.86 111.66 106.04 -0.06
12/10/2019 91.84 111.83 106.02 -0.02
01/10/2020 91.80 112.26 105.97 -0.04
02/10/2020 91.77 112.07 105.94 -0.03
03/10/2020 91.74 112.16 105.90 -0.03
04/10/2020 92.12 111.46 106.34 +0.38

I plotted your amphour history and the difference in the "Lizard" (replacement) pack in my 2012 is stark ! I'm sure that your Atlanta climate vrs Houston has some influence, however, there is essentially no "repeat" of summer/winter swings is evident in your 40 amphour pack.

My 2012 plot:
battery log 5.3.20.jpg

You are spot on except the climate comment. Look at people in Phoenix for guidance. They are seeing much the same. Despite having only initial data sets on newer packs, it seems to be quite the foregone conclusion that Nissan has made great progress addressing heat issues.

 

[danrjones]

define "fast"

Faster than it was during the winter.

During the winter it was dropping about 0.01 every 14 days, plus or minus. Not including the 3 month adjustment.
Now its dropped .01, four times, in a span of two weeks since its started to get hot outside.

In my book that's a lot faster, YMMV.

ok so that is .08% per month? I think I could live with that.

I have to put myself on record as saying I am not on board with daily readings having any major significance and yeah, this is coming from someone who has recorded stats EVERY day my LEAFs have been driven for a few days short of 7 years.

No its not. You are completely forgetting the 3 month adjustments. My last one was 1.47% just by itself.

I have now had the car for a year. It has lost 7.48% since I bought it.

I don't yet buy into the idea the new batteries are better in heat. This summer should tell me a lot.
I certainly have seen no sign of my SOH adjusting up as others have seen. TBD.

 

[DaveinOlyWA]

Faster than it was during the winter.

During the winter it was dropping about 0.01 every 14 days, plus or minus. Not including the 3 month adjustment.
Now its dropped .01, four times, in a span of two weeks since its started to get hot outside.

In my book that's a lot faster, YMMV.

ok so that is .08% per month? I think I could live with that.

I have to put myself on record as saying I am not on board with daily readings having any major significance and yeah, this is coming from someone who has recorded stats EVERY day my LEAFs have been driven for a few days short of 7 years.

No its not. You are completely forgetting the 3 month adjustments. My last one was 1.47% just by itself.

I have now had the car for a year. It has lost 7.48% since I bought it.

I don't yet buy into the idea the new batteries are better in heat. This summer should tell me a lot.
I certainly have seen no sign of my SOH adjusting up as others have seen. TBD.

I guess you just need more time. My pack was in lockstep with yours. Nearly identical along with several others. After a year, I had lost 6.73% (must be that cooler climate, right?)

9+ (yeah, 3 adjustments later) months later, I had lost another .61%

Reread this forum. Compare losses in the first year against losses since then. We have people approaching 2½ years here.