JuneauLeaf
Posts: 1
Joined: Tue Mar 27, 2018 5:00 pm
Delivery Date: 26 Mar 2018

Accuracy of Charge Timer

Mon Apr 02, 2018 8:28 am

We just took delivery of a used 2015 Nissan Leaf SL (98.4% SOH and 36,000 miles). We only have a trickle charge available at home, since there are free L2 chargers at work and all over town.

I’ve tried setting an end time only for our charge timer to keep the SOC at 80%, but it seems wildly inaccurate. Couple of examples:

1) With the battery SOC at 55% I set the charge timer to end at 9am (intending to leave at 8am). Got a NissanConnect message at 9pm that it had started charging. It reached 100% SOC by 6am and stopped charging.

2) With the battery at 38% SOC I set the timer to end charging at 10am. It started charging immediately and was done at 3am.

I thought the car would calculate a start time so that it would reach full charge when the timer ends. Any suggestions as to what’s going on or how to outsmart it?

Thanks!

WetEV
Posts: 2316
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: Accuracy of Charge Timer

Mon Apr 02, 2018 9:33 am

JuneauLeaf wrote:We just took delivery of a used 2015 Nissan Leaf SL (98.4% SOH and 36,000 miles). We only have a trickle charge available at home, since there are free L2 chargers at work and all over town.

I’ve tried setting an end time only for our charge timer to keep the SOC at 80%, but it seems wildly inaccurate. Couple of examples:

1) With the battery SOC at 55% I set the charge timer to end at 9am (intending to leave at 8am). Got a NissanConnect message at 9pm that it had started charging. It reached 100% SOC by 6am and stopped charging.

2) With the battery at 38% SOC I set the timer to end charging at 10am. It started charging immediately and was done at 3am.

I thought the car would calculate a start time so that it would reach full charge when the timer ends. Any suggestions as to what’s going on or how to outsmart it?

Thanks!


The car is pessimistic on how long to charge, especially for L1.

I set a start and stop time and charge for a bit over a hour maximum on home L2, set to add about 35% to the battery. Try about 6 to 8 hours between start and end time for L1. I don't plug in every day, only when the battery is below 50%. This is about every other day. The timer takes the car from less than 50% to about 80%. My current daily driving is fairly unpredictable, but is also usually fairly short. When I take longer drives, I override the timer when I get up so as to finish off the charge before departure.

I'm in a cool place, not as cool as Juneau but close.
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red

like2bike
Posts: 52
Joined: Sat Mar 23, 2013 9:35 pm
Delivery Date: 19 Mar 2013
Leaf Number: 00581
Location: Long Island, NY

Re: Accuracy of Charge Timer

Mon Apr 02, 2018 6:44 pm

JuneauLeaf wrote:I’ve tried setting an end time only for our charge timer to keep the SOC at 80%, but it seems wildly inaccurate.


I have noticed that the accuracy gets worse as the battery loses capacity. It did end a little early when new but with 80% SOH it is way early. However, I see your battery is doing great in AK. I wish Nissan would just provide us the algorithms they use for these functions and not leave us to reverse engineer them.
2013 Leaf S on Long Island, NY
Delivered 3/18/2013, bought off-lease 2/20/2016 $9619
Schneider EVlink level 2 charging

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IssacZachary
Forum Supporter
Posts: 837
Joined: Fri Jan 13, 2017 9:57 am
Delivery Date: 15 Nov 2016
Leaf Number: 420789
Location: Gunnison, CO, USA

Re: Accuracy of Charge Timer

Wed Apr 04, 2018 12:10 pm

It also changes with battery temperature. When the battery is warm enough the timer starts charging early and so the battery is charged up early. But when the battery is very cold it starts at about the same time but, at least on level 2 charging, takes longer to charge and many times ends up not reaching a full charge by the time it's supposed to.

I think the charge timer was designed merely for taking advantage of lower electric costs during the night. I use it, however, to 1) heat the battery a little more in the morning before taking off by waiting to charge it until the morning and 2) to keep the battery closer to 50% charged when I'm not using the car.
2013 SL SOLD :cry:
1972 VW Beetle SOLD :cry:
1984 VW Golf diesel CURRENT :x
2013 Toyota Avalon Hybrid CONTEMPLATING :shock:

SageBrush
Posts: 2788
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: Accuracy of Charge Timer

Wed Apr 04, 2018 12:21 pm

No problems with the timer in our car.

Perhaps you should post a photo of the settings screen
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
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2018 Tesla Model 3 LR, Delivered 6/2018

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