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How Do You limit charging to 80%???

Posted: Fri Jun 20, 2014 5:19 am
by Recycledoug
I saw an earlier post by someone asking how do you stop charging at 80% since 80% appears to be an optimal level for long battery life? Is there a fast answer to this (Other than look at the owners manual)?

Re: How Do You limit charging to 80%???

Posted: Fri Jun 20, 2014 5:35 am
by Recycledoug
I think I just found the answer from earlier posts... Leafs prior to 2014 had a software option where you could limit the charge to 80%.... In 2014 there is not such option... The charge is 100%... And I guess Nissan's rationale for this is that they have improved the "internal" cooling of the battery cells. IE battery degradation (less) has been improved and therefore Nissan does not see the 80% limit as being necessary especially in "hot" climates....

Feel free to correct me if I am wrong here....

Re: How Do You limit charging to 80%???

Posted: Fri Jun 20, 2014 6:47 am
by pchilds
Recycledoug wrote:I think I just found the answer from earlier posts... Leafs prior to 2014 had a software option where you could limit the charge to 80%.... In 2014 there is not such option... The charge is 100%... And I guess Nissan's rationale for this is that they have improved the "internal" cooling of the battery cells. IE battery degradation (less) has been improved and therefore Nissan does not see the 80% limit as being necessary especially in "hot" climates....

Feel free to correct me if I am wrong here....

Nissan removed the 80% option to get a higher EPA miles range rating, it went from 75 miles to 83 miles.

To charge to 80%, when charging at 3.3 kWh subtract 1:20 off the 240V charge time estimate, for 6.0 kWh subtract 0:40.

If it says 3:30, for 3.3 kWh, set the start time for 12:00 am and the end time for 2:10 am, for 6.0 kWh, set the start time for 12:00 am and the end time for 2:50 am.

Re: How Do You limit charging to 80%???

Posted: Fri Jun 20, 2014 8:30 am
by Recycledoug
Well, I stand corrected... On page CH-30 of the 2014 Leaf Owner's Manual it shows how to move between 100% and 80% charging....:

How to set the long life mode (models
without navigation system)
1. Push the switchA on the left side of
the combination meter panel.

2. Push the switch B to highlight
“Charge %” on the dot matrix liquid crystal
display and then push the switch.

3. Use the switch to highlight “80%” or
“100%” and then push the switch to
finalize the selection.

Re: How Do You limit charging to 80%???

Posted: Fri Jun 20, 2014 12:44 pm
by dgpcolorado
Recycledoug wrote:Well, I stand corrected... On page CH-30 of the 2014 Leaf Owner's Manual it shows how to move between 100% and 80% charging....:

How to set the long life mode (models
without navigation system)
1. Push the switchA on the left side of
the combination meter panel.

2. Push the switch B to highlight
“Charge %” on the dot matrix liquid crystal
display and then push the switch.

3. Use the switch to highlight “80%” or
“100%” and then push the switch to
finalize the selection.
The manual is incorrect for USA 2014 cars. They didn't update the language from the 2013 manual. So, no, there should be no 80% option for 2014 LEAFs.

It isn't clear that charging to 80% helps all that much with battery life, assuming that the "100%" charging finishes just before you leave home (leaving the battery at 100% for days at a time is very likely not good for it).

But if you want to charge to a lower level you can do that by using end-time charging with the end-time set to after you plan to leave. Since charging finishes a bit early, it will take some experimentation to get the right time. A bit of a kludgy workaround, but it can be done.

Re: How Do You limit charging to 80%???

Posted: Sat Jul 05, 2014 7:11 pm
by Recycledoug
I asked my dealer if Limiting the charge to 80% is beneficial for better battery longevity? The service department stated that the 100% charge level will not adversely impact the life of the battery.

Re: How Do You limit charging to 80%???

Posted: Sat Jul 05, 2014 7:24 pm
by cwerdna
Recycledoug wrote:I asked my dealer if Limiting the charge to 80% is beneficial for better battery longevity? The service department stated that the 100% charge level will not adversely impact the life of the battery.

We've had many instances of lack of dealer knowledge. It's funny how Nissan had all sorts of warnings before about leaving the car at high SoC for the '11 thru '13 model years and then changed their tune w/the '14+. As many of us believe, it was done in order to artificially boost their EPA range rating, to make it look more competitive/better than others.

It really sucks that plug-ins get bitten by that. The rules need changing so that either ALL plug-ins are bit by the 80%/100% averaging rule (http://www.greencarreports.com/news/108 ... -standard; Rav4 EV got bit by that too) or NONE are, to get rid of these shenanigans.

Nissan previously made all sorts of statements about what predictions on battery capacity remaining (e.g. https://www.youtube.com/watch?v=DShtvd5jJHQ at ~1 min mark, where they claim over 10 year life, 70 to 80% remaining or http://green.autoblog.com/2012/06/15/ni ... leaf-batt/) and not needing thermal management (http://green.autoblog.com/2010/01/25/is ... ngineered/ and http://www.wired.com/2010/01/nissan-leaf-2/).

Obviously, they turned out to be not true for those in Phoenix and hot climates (viewtopic.php?f=30&t=9694), where some folks lost 20 to 30+% in less than 2 years. And, it seems like it's not going to turn out to be true for many folks in the US (see some thoughts at viewtopic.php?f=27&t=16236).

Re: How Do You limit charging to 80%???

Posted: Sat Jul 05, 2014 10:00 pm
by johnrhansen
I drive a 2013. Lets say my time to charge to 80 percent says 1 hour. If I set my charge limit to 100 percent, it goes to 3 hours, 2 hours more than 80 percent. That last hour, the light is still blinking, but nothing really is happening. It's already at 100 percent. So if I wanted 80 percent, I'd just set your charge timer to 2 hours after you really want to leave. See where that gets you, and adjust your time say 2 minutes for every percent you want to change. Really if you could stop the charge at 95 percent or less you would be alright.

Re: How Do You limit charging to 80%???

Posted: Sat Jul 05, 2014 10:36 pm
by gbarry42
johnrhansen wrote:...set your charge timer to 2 hours after you really want to leave...
If you are charging the battery, and then going somewhere, then charging to 100% makes almost no difference with respect to battery health. It only matters if it sits at 100% without being used for an extended time.
...you could stop the charge at 95 percent or less you would be alright.
If you are going near 100% charge, then it is worth letting it go all the way. The time spent during the "nothing really is happening" part is used for balancing the battery.

Re: How Do You limit charging to 80%???

Posted: Sat Jul 05, 2014 10:49 pm
by johnrhansen
At 100 you get no regeneration.