GerryAZ
Gold Member
Posts: 1408
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: when does DCQC cause degradation?

Wed Sep 27, 2017 8:36 pm

DaveinOlyWA wrote:At a public charging station there is an authentication process to verify access. This happens EVERY time the power is cycled. So you CANNOT balance a pack at an L2 or an L3 unless its a station that is free and always on (needs no card, smartphone access, etc.) Now L3's that are free and only require a button to be pushed will also not balance the pack.

To balance a pack, it requires multiple power on cycles.


I don't know about later models, but both 2011 and 2015 will hold L2 (or L1) charging active until charge is complete so cell balancing will function on public L2 EVSEs. Charging current will cycle down to very low levels during balancing so public charging cost could be high if charges are based on time instead of energy. I think the balancing shunts are also active during DCQC so some cell balancing happens, but car will not get a full charge when using DCQC.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

LeftieBiker
Posts: 6943
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: when does DCQC cause degradation?

Wed Sep 27, 2017 8:41 pm

I don't know about later models, but both 2011 and 2015 will hold L2 (or L1) charging active until charge is complete so cell balancing will function on public L2 EVSEs. Charging current will cycle down to very low levels during balancing so public charging cost could be high if charges are based on time instead of energy. I think the balancing shunts are also active during DCQC so some cell balancing happens, but car will not get a full charge when using DCQC.


That was my impression of the 2013+ Leafs as well, but I don't have QC so didn't want to state it as fact.
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.

DaveinOlyWA
Gold Member
Posts: 12085
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: when does DCQC cause degradation?

Wed Sep 27, 2017 8:53 pm

GerryAZ wrote:
DaveinOlyWA wrote:At a public charging station there is an authentication process to verify access. This happens EVERY time the power is cycled. So you CANNOT balance a pack at an L2 or an L3 unless its a station that is free and always on (needs no card, smartphone access, etc.) Now L3's that are free and only require a button to be pushed will also not balance the pack.

To balance a pack, it requires multiple power on cycles.


I don't know about later models, but both 2011 and 2015 will hold L2 (or L1) charging active until charge is complete so cell balancing will function on public L2 EVSEs. Charging current will cycle down to very low levels during balancing so public charging cost could be high if charges are based on time instead of energy. I think the balancing shunts are also active during DCQC so some cell balancing happens, but car will not get a full charge when using DCQC.


My comment was on DCFCs only. L2 operation has not changed but to be honest with you I have never fully charged on an L2 and so dk what it would do.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 24,261.3 miles.363 GIDAhr 80.66Hx95.95%kwh28.1QCs205,L2's 226
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