specialgreen
Posts: 29
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

slow DCFC in winter

Fri Nov 10, 2017 3:44 pm

In August, at about 70F, I was charging at 12.9 watt-hours/second doing DCFC. Yesterday at 16 degrees F, I was getting 5.75 watt-hours/second at the same charge station. The amount I can charge in a half-hour appears to have dropped from 23kw-hrs to 10.

GerryAZ
Gold Member
Posts: 1454
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: slow DCFC in winter

Sat Nov 11, 2017 7:20 am

Internal resistance of battery is higher at low temperatures so lithium battery controller (LBC) limits maximum charging current to keep cell voltages below the maximum allowable. The LBC also limits regeneration for the same reason.
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

specialgreen
Posts: 29
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Re: slow DCFC in winter

Mon Nov 13, 2017 10:17 pm

Would charging at the end of the commute help? I had gotten into the habit of DCFC charging every other day (my commute is only 14 miles). I'm not surprised to see charging slow-down, but 57% slower? Yowza.

This reminds me that I saw a used Leaf on Craigslist, and the previous owner said he'd added a battery warmer. If I were driving, and knew I was headed to a DCFC in 10 miles, I wouldn't mind using some juice to warm the battery into a state where it would accept a fast charge.

LeftieBiker
Posts: 7170
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: slow DCFC in winter

Mon Nov 13, 2017 11:38 pm

That was likely a 2011 Leaf, and the warmer was added just to protect the battery from freezing.
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.

arnis
Posts: 743
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: slow DCFC in winter

Thu Nov 16, 2017 3:30 am

With cold battery having lower state of charge helps to speed up quick charging.
Visiting DC station at 10-20% would be perfect.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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