gmcjetpilot
Posts: 42
Joined: Mon Oct 30, 2017 6:45 pm
Delivery Date: 07 Oct 2017
Leaf Number: 305601
Location: Memphis TN

How Do I Charge To 95%

Sun Dec 03, 2017 11:30 pm

I know my 2015 has newer battery design. Nissan says it's OK to charge to 100% every time. However some experts still recommend you don't, limit charge to 95% (and they give technical facts to back it up). The advice to not leave battery at 100% for extended time is still valid I assume.

Does anybody have any clever idea on how to do charge to 95%. I know you can use the charge timer to limit the amount of time you charge, but calculating the exact time to shut it off is kind of tricky. I've tried it a couple times to reduce charging time. Apparently not enough, it ends up at 100% anyway. Is there some way to set shut off at 95%? Is there a time to charge chart based on temperature and starting charge to get to 95%?

LeftieBiker
Posts: 8883
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: How Do I Charge To 95%

Sun Dec 03, 2017 11:45 pm

There is no way to set the car to charge to 95%. If it makes you feel any better, 100% indicated charge is likely more like 96% actual charge. You can get a charging station with a timer or even a remote start-stop feature, and estimate when you want it to stop.

Yes, it does suck.
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.

alozzy
Posts: 1004
Joined: Fri Jan 20, 2017 4:25 pm
Delivery Date: 18 Jan 2017
Location: Vancouver, BC
Contact: Website

Re: How Do I Charge To 95%

Mon Dec 04, 2017 12:09 am

I've mentioned it a few times now in these forums but haven't seen any posts by anyone who owns one. For $200, I think it's a little pricey, but the JuicePlug will do the trick, based on the sales copy:

https://emotorwerks.com/products/chargi ... /juiceplug
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV :D

lkkms2
Gold Member
Posts: 323
Joined: Wed Jul 20, 2011 8:10 am
Delivery Date: 30 Dec 2016
Leaf Number: 302025
Location: San Diego/National City, CA

Re: How Do I Charge To 95%

Mon Dec 04, 2017 4:08 am

When you come home you take a few moments to plug in your vehicle. Just make it a habit to set the timer so you get around 95% or whatever percent you want.

How do you do this? Simply. First do a one hour charge and note the change in battery state of charge. If the battery State of charge changed about 20%, then you have a multiplier for how many hours to charge based on your starting point.

The last 5 or 10% to 100% takes a little longer than when Charging from a state of charge in the middle (say 30 of 40%), but you can do a few trail Charging to find something your happy with.

Yes, it’s an extra step. Only you can decide how much you really want to do this. But once you develope the habit, it is not that hard.

Note: once a year or so you may want to reconfirm the % Change in state of Charge for one hour charging as this may change slightly over time if the battery degrades. Also, be aware of how temperature may affect this.
2011 Leaf SL purchased 6-22-2011, sold 1-18-2017 with new battery.
2017 Leaf SV with Premium Package purchased 12-30-2016

baustin
Posts: 621
Joined: Tue Feb 24, 2015 1:23 pm
Delivery Date: 09 Mar 2015
Leaf Number: 402162
Location: North Las Vegas, NV

Re: How Do I Charge To 95%

Mon Dec 04, 2017 4:33 am

If you are driving the car after every charging session, there is no valid reason to not charge to 100%. Trying to calculate when it will hit a specific % during the charging process is almost impossible, especially above 80%. The charging rate is varied based on pack temperature and resistance, and slows down as it gets closer to full. The final part of the process is balancing the cells, and that varies in time based on cell state. The resistance of the pack increases with age and degradation, but there is no chart to spell it out as it is different for every pack. Charging to around 80% should be fairly easy to estimate, based on the SOC and EVSE Charge Rate. Above that is a guessing game.

Charge it and drive it and don't worry about it. There is no hard evidence that regularly charging to less than 100% significantly extends the life of the battery pack. Just don't let it sit at 100% for extended periods, especially in high heat. That is known to speed up degradation, as experienced by those living in hot climates, and is a method used by those with marginal packs to help ensure the necessary drop to get a warranty replacement. If the car is going to be sitting idle for extended periods, it is best to keep the charge state between 20% and 80%.

I live in a hot climate, and just recently had the battery pack replaced under warranty. I have the 80% charge option, and use that with the timer to delay the start of charging until 2:00am. I do that because I don't drive the car every day. On the days that I know I will drive enough to get below 80%, I charge to 100% to balance the cells. Since I have a separate work vehicle, the Leaf can sometimes sit idle for a week. Not letting it go above 80% will help keep degradation in check (along with the dirt parking space under the trees). If I did not have the 80% option, I would have to get a much more expensive EVSE with the ability to control charging.
2013 Leaf SV - Cayenne Red - QC Port - LED Headlights

gmcjetpilot
Posts: 42
Joined: Mon Oct 30, 2017 6:45 pm
Delivery Date: 07 Oct 2017
Leaf Number: 305601
Location: Memphis TN

Re: How Do I Charge To 95%

Mon Dec 04, 2017 9:11 am

Thanks all for the great replies. I understand. The comments cover all bases...

SageBrush
Posts: 2481
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: How Do I Charge To 95%

Mon Dec 04, 2017 10:36 am

If you have LeafSpy (LSpy), this is pretty easy to figure out:

1. Read from LSpy your battery capacity at 100%
2. Let us know your EVSE volt and amp specs

Then we can tell you the battery % charging increase per time.

As an example,
My EVSE charges up the car 1% every two minutes (an L2 240 volt, 30 Amp device that sends ~ 6 kWh per hour to the battery)
If I return home at a SoC of 30% and want to leave the car at 80%, I set the timer to charge 100 minutes.

---
If you do not like arithmetic, then do this:
Note the starting and ending SoC after an hour charge.
The difference is the percent increase per hour.
NOTE that different EVSEs may have different charging rates, so the results may not be transferable.
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Car is now enjoying an easy life in Colorado
3/2018: 58 Ahr, 28k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

powersurge
Posts: 979
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: How Do I Charge To 95%

Mon Dec 04, 2017 11:56 am

There is no reason to make extra effort to charge to 95%, or even to 90%. Charge up to 100% and be done with it..

SageBrush
Posts: 2481
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: How Do I Charge To 95%

Mon Dec 04, 2017 12:10 pm

powersurge wrote:There is no reason to make extra effort to charge to 95%, or even to 90%. Charge up to 100% and be done with it..

Bad advice, if the battery is going to sit at 100% charge at higher temperatures
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Car is now enjoying an easy life in Colorado
3/2018: 58 Ahr, 28k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

gmcjetpilot
Posts: 42
Joined: Mon Oct 30, 2017 6:45 pm
Delivery Date: 07 Oct 2017
Leaf Number: 305601
Location: Memphis TN

Re: How Do I Charge To 95%

Wed Dec 06, 2017 7:37 pm

I recorded charge time to between 90-95% from different starting charge states. I notice charge rate starts to slow down above 91%.

Image
Last edited by gmcjetpilot on Wed Dec 06, 2017 10:24 pm, edited 1 time in total.

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