WetEV
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Re: 12 volt Battery dying while charging leaf

Thu Aug 16, 2018 9:03 am

jimmol wrote:LeafSpy shows that my car has 22.6 kW


LeafSpy shows the correct units for me, currently 12.7 kWh.


jimmol wrote:Thanks for the point back to the correct terminology, though sometimes is has been easier to call it a charger when talking to someone who knows nothing about electric cars, but now I could call it the conduit for electricity to go into the car charger. Truthfully, I forget what EVSE stands for...Electrical Vehicle S______ E_____. Getting older and more forgetful.


Me too. The old and forgetful part.

I usually use the phrase "charging station", which is easier to remember, especially with someone that knows nothing about electric cars.

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cwerdna
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Re: 12 volt Battery dying while charging leaf

Thu Aug 16, 2018 9:24 am

jimmol wrote:I guess I was trying to be thorough. LeafSpy shows that my car has 22.6 kW available at the end of a full charging session. The kW info was added in case someone reading the post had an Aha! moment, realizing that ___________ was the reason the leaf would stop charging, or receiving electricity to covert to charge, before it usually does. Obviously that did not happen.

Huh? 22.6 kW available still sounds like the wrong units. Look again.

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Sondy132001
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Re: 12 volt Battery dying while charging leaf

Thu Aug 16, 2018 9:38 am

I plug my battery in on Friday evening say 6pm and I do not unplug it until I leave for work at 7:30am Monday and I have no issues. I trickle charge every night Mon-Fri and my car is plugged in for 12 hours at least every night, for the past 3 years, not sure what the prior owner did (they had it 2012-2015) ? But I have no issues with my battery.

And I live in Southern CA, it's HOT, my car at home is on the driveway, but at work it's in a parking structure.

I'd say you have a bad battery.
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BrockWI
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Re: 12 volt Battery dying while charging leaf

Thu Aug 16, 2018 11:34 am

I would recommend using an external charger to make sure the new 12v is fully charged at least initially.

I also weekly charge the 12v battery.
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DanDietrich
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Re: 12 volt Battery dying while charging leaf

Mon Aug 27, 2018 9:39 am

Just tagging on to this. I have been through all of this repeatedly with my 2014. Can anyone tell me if Nissan has changed anything in the system for the new 2018 or 2019 cars? Can the EVSE also finally top off the 12 volt battery? Or is it more of the same after years of problems?

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Re: 12 volt Battery dying while charging leaf

Mon Aug 27, 2018 1:33 pm

DanDietrich wrote:Just tagging on to this. I have been through all of this repeatedly with my 2014. Can anyone tell me if Nissan has changed anything in the system for the new 2018 or 2019 cars? Can the EVSE also finally top off the 12 volt battery? Or is it more of the same after years of problems?


I don't know if the 2018 charges the 12 volt battery while connected, but I do know it now charges the accessory battery much more effectively. I think this is because with the automatic lights they need for the car to be aggressive about charging it, especially while it's off. So even if it doesn't charge that little battery while connected, it will try harder to recharge it when it's disconnected.
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Re: 12 volt Battery dying while charging leaf

Mon Aug 27, 2018 1:49 pm

It is good to hear that they are addressing half of the problem. Too bad about the other half. I did some hard looking at a Bolt for this info and it appears that the 12 volt battery on that car can be topped off by the main battery even when plugged in. That is a big thing. I am waiting to see what cars come out in the next year or so so I can replace the Leaf I have. So far nothing is perfect.

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Sondy132001
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Re: 12 volt Battery dying while charging leaf

Tue Sep 04, 2018 1:36 pm

BrockWI wrote:I would recommend using an external charger to make sure the new 12v is fully charged at least initially.

I also weekly charge the 12v battery.


Why do you charge the 12v battery ? I never have, do you have the solar panel on the back top of your Leaf ?
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Lost my 4th bar @ 49,474 miles 11-19-17

BrockWI
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Re: 12 volt Battery dying while charging leaf

Tue Sep 04, 2018 1:51 pm

I charge the 12v battery becasue the charging stages the Leaf uses isn't not good at charging a dead or weak 12v battery. It bulk charges at 50+ amps which pushes up the voltage prematurely in a smaller battery which makes he car "think" the 12v is full when it isn't actually fully charged yet. A larger or healthy 12v battery won't pop up in voltage as much and accept more of a charge.

I always use an external charger to fully charge a new or a run dead 12v battery for any vehicle. I had been charging our Leaf at least once a week and often it takes 5 to 25 amp hours to fully charge the aux battery which implies the car isn't correctly charging the 12v battery.

For the last two week I have disconnected the current shunt at the 12v battery and both of the last two weeks the 12v would top off in 5 minutes of external charging, I might be overcharging the 12v but it looks like it is floating about 13.9v when ever I look at it, which should be ok.

The Leaf S, does not have a solar panel on it, I believe it is just the SV or does the SL have a panel as well? Not that it does much, but better than nothing, although our Leaf is garaged so it wouldn't help much anyway.
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tobleafornot
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Re: 12 volt Battery dying while charging leaf

Mon Sep 10, 2018 2:13 pm

Been having this problem too after years of no problems. New battery did not help at all. This is absolutely stupid that you have to charge two batteries. Definitely something faulty with the whole thing. Time for a recall Nissan.

BrockWI wrote:I charge the 12v battery becasue the charging stages the Leaf uses isn't not good at charging a dead or weak 12v battery. It bulk charges at 50+ amps which pushes up the voltage prematurely in a smaller battery which makes he car "think" the 12v is full when it isn't actually fully charged yet. A larger or healthy 12v battery won't pop up in voltage as much and accept more of a charge.

I always use an external charger to fully charge a new or a run dead 12v battery for any vehicle. I had been charging our Leaf at least once a week and often it takes 5 to 25 amp hours to fully charge the aux battery which implies the car isn't correctly charging the 12v battery.

For the last two week I have disconnected the current shunt at the 12v battery and both of the last two weeks the 12v would top off in 5 minutes of external charging, I might be overcharging the 12v but it looks like it is floating about 13.9v when ever I look at it, which should be ok.

The Leaf S, does not have a solar panel on it, I believe it is just the SV or does the SL have a panel as well? Not that it does much, but better than nothing, although our Leaf is garaged so it wouldn't help much anyway.

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