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TomT
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 10:37 am

Very shortly after I got my Leaf, I accidentally left it on in the parking structure at work... When I came back out 12 hours later, it was down to four bars (they were real bars in those days so indicated about a bar and a half less actual remaining charge than what we see today). I knew I'd not make it home (it was 26 miles and uphill) on that so I had to stop and charge en-route for about and hour (not an easy task to find an EVSE in those days)...
lpickup wrote:I was at a hockey game about a month ago. I had the car in ON mode playing music as we tailgated. I thought I turned it off when we left, but maybe I didn't.
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
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Nubo
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 11:25 am

Staque wrote:I'm guessing, after searching the forum for "12V", that it was the fact that I left it plugged into the EVSE for 2 days.

Any thread where people mention a problem leaving it plugged in, the phrase "for more than a day" is used. :)

What is the 12V load when the EVSE is plugged in? I must be close to 1A? (I don't have an ammeter.)
If you search, I'm pretty sure Ingineer quantified that drain profile somewhere along the way.

Iirc, the "dark current" with the car plugged in (but not charging the traction pack) was considerably higher than being unplugged, with the added insult that being plugged-in inhibits 12V top-off charging via the DC-DC converter, which otherwise occurs every 5 days.

If the 12V battery has already undergone one or more instances of being deeply drained, it may already have suffered permanent loss of capacity, so time before dying can get shorter and shorter.
I noticed you're still working with polymers.

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lpickup
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 12:24 pm

sorphin wrote:
lpickup wrote:
DanBaldwin wrote:Out of curiosity I checked my 2012 SL, and it doesn't run the dc/dc converter in accessory mode, or in on mode, only in ready mode.
...

I suppose it is possible that my recollection is not good, but I'm pretty sure the car was not in READY, but rather just ON.
Being in 'On' does the same thing as being 'in Ready" (it's like being in 'ignition mode' on an ICE, but not starting the engine..) the computer and everything else are still sitting there running... the blue light was on because the DC to DC converter was recharging the 12v battery so it didn't die.
Yes, I understand. I frequently put the car into ON mode when I do things like adjust my timers, etc.

The point is, however, that assuming my LEAF was in ON mode (and not READY), then that would run contrary to DanBaldwin's statement that the DC/DC converter does not run in ON mode.

AND, I'd like to add that had I done that in an ICE I would've needed a jump...as it was though I probably was only down a bar (if even that).
...Lance

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sorphin
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 12:46 pm

lpickup wrote: The point is, however, that assuming my LEAF was in ON mode (and not READY), then that would run contrary to DanBaldwin's statement that the DC/DC converter does not run in ON mode.

AND, I'd like to add that had I done that in an ICE I would've needed a jump...as it was though I probably was only down a bar (if even that).

The DC to DC doesn't run if you're _plugged in_.

"Iirc, the "dark current" with the car plugged in (but not charging the traction pack) was considerably higher than being unplugged, with the added insult that being plugged-in inhibits 12V top-off charging via the DC-DC converter, which otherwise occurs every 5 days. "

Phatcat73
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 1:01 pm

If you leave the car in accessory mode, then open the door, the car will provide a continuous door ajar alert. I find that leaving the car in accessory is difficult to overlook. Prior to the Leaf I had an Infiniti M35 with the same keyfob / push to start button. I never left it in accessory.

Anyway, since my dead car incident on 4/29 the car's been fine. The only variables, are that I'm much more aware to ensure my car is off, prior to exiting. I also turned off the carwings auto-download at powerup feature (I got tired of google send-to-car updating the same addresses each time i powered up the vehicle)
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Ingineer
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 1:31 pm

sorphin wrote:The DC to DC doesn't run if you're _plugged in_.

"Iirc, the "dark current" with the car plugged in (but not charging the traction pack) was considerably higher than being unplugged, with the added insult that being plugged-in inhibits 12V top-off charging via the DC-DC converter, which otherwise occurs every 5 days. "
The DC-DC runs anytime the main contactor is closed. This means, Ready mode, Active charging, remote/timer climate mode, or when the automatic 12v battery charge mode is activated. One suggestion I've made is to set a short charge timer once a day that would offset this, but it still then cycles the 12V a lot. The simplest and easiest is to simply disconnect the 12v negative terminal.

-Phil
Easily Learn Electricity HERE! - - - - Website: http://evseupgrade.com/[/size] - - - - Like us on Facebook: EVSE Upgrade

cliff
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 2:00 pm

My first thought when I read about the battery constantly going down,
was that the the radiator fans might be running. If the fan termperature
sensors are not connected, then the sensor values may float enough to
cause the fans to come on. Just a guess about the float, may not be true.

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Ingineer
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon May 13, 2013 4:40 pm

cliff wrote:My first thought when I read about the battery constantly going down,
was that the the radiator fans might be running. If the fan termperature
sensors are not connected, then the sensor values may float enough to
cause the fans to come on. Just a guess about the float, may not be true.
The radiator fans will not do this, in addition, if they were somehow running, it would be immediately obvious, as they are noisy.

-Phil
Easily Learn Electricity HERE! - - - - Website: http://evseupgrade.com/[/size] - - - - Like us on Facebook: EVSE Upgrade

Phatcat73
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Thu May 30, 2013 7:48 am

Interesting anomaly occurred the other day- I parked, shut off the car, opened the door and heard the door ajar chime. I looked at the dash and the nav screen and they were black, suggesting the car was powered off. As I'm hyper sensitive to approaching the car the following day and discovering a dead battery, I'm more aware of how I exit the vehicle these days.

Upon powering off & exiting, the door ajar warnings should NOT sound (unless you have the car on, in accessory or have the headlights on)

My workaround was to power on the car, then shut it off again. This time, no chime with the door open. Haven't had a dead battery since 4/29.
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davewill
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Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Thu May 30, 2013 8:51 am

Phatcat73 wrote:Interesting anomaly occurred the other day- I parked, shut off the car, opened the door and heard the door ajar chime. I looked at the dash and the nav screen and they were black, suggesting the car was powered off. ...
The usual reason this happens t me is because of clicking the door handle just a tiny bit before hitting the power button. I never had it cause a dead battery, though.
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