Superchewie
Posts: 13
Joined: Mon May 01, 2017 9:28 pm
Delivery Date: 29 Apr 2017

12v Battery Charging on L1?

Sat Oct 07, 2017 7:51 am

Hi folks,

So sorry if this is covered here in the forum already; did my best on the search function to find the info I’m asking here, but it’s likely “my best” is a pitiful effort...

I’m curious as to if the 12v battery charges (or at least floats) on L1. I trickle charge my ‘13 at work for 3-4 hours per day using the stock EVSE. Am I also providing a slight conditioning benefit to the 12v battery?

It’s my understanding that the DC-DC converter is activated on L2 charges. Not sure about L1, though.

This affects how often I will schedule myself to put a battery tender on my 12v.

Thanks!
2013 S with Quick Charge
~50,000 km, 85% SOH
South-West British Columbia, Canada

User avatar
RegGuheert
Posts: 5544
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: 12v Battery Charging on L1?

Sat Oct 07, 2017 8:28 am

Yes, the LEAF charges then floats the 12-V battery when charging at an L1 rate. In very cold temperatures (below about 20F), it does not drop down to its float voltage of 13.1V. Rather, it stays at a temperature-compensated charging voltage of around 14.5V.
RegGuheert
2011 Leaf SL Demo vehicle
2011 miles at purchase. 10K miles on Apr 14, 2013. 20K miles (55.7Ah) on Aug 7, 2014, 30K miles (52.0Ah) on Dec 30, 2015, 40K miles (49.8Ah) on Feb 8, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

Superchewie
Posts: 13
Joined: Mon May 01, 2017 9:28 pm
Delivery Date: 29 Apr 2017

Re: 12v Battery Charging on L1?

Sat Oct 07, 2017 11:54 am

Thanks! That’s great info.

So my daily L1 charge cycles are likely giving the 12v battery some good conditioning time. I’ll still use a battery tender once a month or so, but will have less stress knowing that my L1 charges are helping out!
2013 S with Quick Charge
~50,000 km, 85% SOH
South-West British Columbia, Canada

LeftieBiker
Posts: 6938
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12v Battery Charging on L1?

Sat Oct 07, 2017 12:01 pm

If you drive a pre-2015 leaf, and especially a 2013, that L-1 charging likely isn't enough for the 12 volt battery. Please add your year and model to a signature line.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

Superchewie
Posts: 13
Joined: Mon May 01, 2017 9:28 pm
Delivery Date: 29 Apr 2017

Re: 12v Battery Charging on L1?

Sat Oct 07, 2017 12:05 pm

My first post indicates that my car is a ‘13.

I’ll add it to my signature, though, once I figure out how!
2013 S with Quick Charge
~50,000 km, 85% SOH
South-West British Columbia, Canada

LeftieBiker
Posts: 6938
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12v Battery Charging on L1?

Sat Oct 07, 2017 4:15 pm

Signature line is in the use control panel. I haven't done it lately, so don't remember the details. I suggest you measure the rest voltage of the 12 volt battery, by releasing the hood latch and then leaving the car off for 15-30 minutes, then opening the hood (but no doors) and checking voltage with a multimeter. Anything over 12.6 volts is fine, 12.5-12.6 is marginal, and anything below that indicates a very low battery. Many of us trickle charge our 2013's battery with a battery maintainer when plugged in. I added a hardwired connection through the charging port compartment. You especially want to avoid leaving the car plugged in but not charging for more than an hour or two, unless you know the 12 volt battery is above 12.6 volts or a maintainer is connected. The battery will eventually get drained otherwise.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

cwerdna
Gold Member
Posts: 7067
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: 12v Battery Charging on L1?

Sat Oct 07, 2017 6:46 pm

Superchewie wrote:I’ll add it to my signature, though, once I figure out how!

ucp.php?i=ucp_profile&mode=signature should work.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

Superchewie
Posts: 13
Joined: Mon May 01, 2017 9:28 pm
Delivery Date: 29 Apr 2017

Re: 12v Battery Charging on L1?

Sun Oct 08, 2017 8:29 am

Thank you! Hopefully that did it!
2013 S with Quick Charge
~50,000 km, 85% SOH
South-West British Columbia, Canada

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