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Ability to stop charging on 2014 to avoid 100%

Posted: Thu Jun 12, 2014 11:43 am
by achewt
Nissan, I understand the apparent reason that you removed the ability to have the 2014 model car stop charging at 80% (to avoid the way EPA tested range on the earlier model[s]); however, I REALLY NEED THIS FEATURE!

Scenario: I drive to a mountain town a few times per week and have to charge my car in order to complete the return trip. However, I only need 60%-80% of my battery available when I leave. Unfortunately on the 2014, there is no way to have my car stop charging at a certain %. I either have to fiddle with the car charge timer each time and try to anticipate how long it will take to reach a certain %, or I start doing whatever I need to do and send a command to my car to charge via the smart phone app when I think I am 1 - 1.5 hours from being done my activity. This is incredibly cumbersome. I don't want to charge to 100% (or even 85%), because the hill back down to the valley is almost 600m (2000ft) and is only 9km long (average grade of 7%). I need the "head-room" in my battery to be able to use regeneration to slow me down - ideally at 30kW (which only seems possible under about 85%); otherwise I have to use the mechanical brakes on this long hill. I can't be the only person stuck with this scenario.

My suggestions:
1) Reimplement whatever software used on the 2013 or earlier model that allows the driver to select the maximum % that they want the car to be charged to
2) Change the smart phone app such that you can STOP charging remotely, as well as start it

Thank you for your consideration.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Sun Jun 29, 2014 7:53 pm
by Metalman
I agree, I have a similar situation on a smaller scale. If I could go to 90% I could be close to 100% by the time I'm off my hill. I would suggest they have it selectable in increments of 5 starting at say 60%. If they are not suggesting that you charge to other than 100% it shouldn't concern the EPA.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Sun Jun 29, 2014 8:56 pm
by johnrhansen
All they need to do is make the 80 percent charge feature an option you can choose when you buy the car, or an optional update you can pay the dealer to install if you already own the car. I'm sure this feature can be added with a simple software update if Nissan chooses to make it available.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Fri Aug 01, 2014 8:33 pm
by Zurc
One thing you can do is monitor the charge via app or whatever and when it gets to the desired value, just pull the plug.

Zurc.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Fri Aug 01, 2014 9:57 pm
by Stoaty
I use this simple rule of thumb:

Every 10 minutes of L2 charging (3.3 kw charging, if 6.0 kw charging need to make an adjustment) adds 3% Gids. Example:

Your Leaf has 30% Gids (from Leaf Spy, in my signature or LeafDD) and you want to charge to 70% Gids - charge for 130 minutes. Pretty accurate, but not as convenient as having 80% charge.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Mon Oct 06, 2014 3:08 pm
by a2t
whats wrong with charging to 100%? I just got my 2015 leaf and plug it in frequenty cuz I never know how far im going next. is it bad to always top it off to 100 ?

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Mon Oct 06, 2014 3:29 pm
by donald
a2t wrote:whats wrong with charging to 100%? I just got my 2015 leaf and plug it in frequenty cuz I never know how far im going next. is it bad to always top it off to 100 ?
You don't appear to have read the OP.

Try again, and this time read to the end of the 2nd paragraph before giving up reading what someone else has written.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Mon Oct 06, 2014 7:07 pm
by johnrhansen
I noticed how the charging current tapers off as the battery fills. I wonder if that characteristic could be used to shut off the EVSE when the current starts to taper over a long period, say 5 minutes.

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Mon Oct 06, 2014 7:43 pm
by Randy
It's not a perfect world, but why not use the end of charge time setting on the timer, and rig it by telling the system you're going to leave later than you actually are...

Example, set the timer end of charge to 10am, and plan on leaving at 9am or so...

Re: Ability to stop charging on 2014 to avoid 100%

Posted: Mon Oct 06, 2014 8:51 pm
by achewt
Randy wrote:It's not a perfect world, but why not use the end of charge time setting on the timer, and rig it by telling the system you're going to leave later than you actually are...

Example, set the timer end of charge to 10am, and plan on leaving at 9am or so...
Well I'm embarrassed to write that I thought that using the End Timer by itself was only an option on 2013 or older Leafs. I hadn't read the user manual, and when I set the Timer via the Nav system initially, it had a Start Time and an End Time. Imagine my surprise when I just went out to my car to find a line in the manual that noted that if only and End Timer was set, the car would automatically figure out when to start charging! However, it says nothing in the manual on how to accomplish this - a few seconds of fiddling around and I figured it out though, just push the 'Clear' button and it replaces whatever Start Time was set with a bunch of wild card characters (*).

So, for my regular morning commute, I will 'trick' the system by setting the charge timer for 0:40 after I actually plan to leave - my home EVSE allows my car to charge at ~30%/hr, so I should be right around 80% most mornings when I leave.

Still won't solve my initial situation where I go to the mountain town in the afternoon and have varied departure times that I don't know in advance... but less math involved now if I do try to guess. That's something anyways.