User avatar
evnow
Moderator
Posts: 11480
Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

What is the Charging efficiency for Leaf ?

Sat Feb 26, 2011 8:00 pm

There have been some sporading discussion of the charging efficiency in various threads. I wanted to get your opinion in one thread.

I drove 32 miles yesterday from the dealer. Blink showed 13.58 kwh of charging at night - so it comes to 2.36 miles/kwh wall to wheels.

Assuming 80% charging efficiency, that would be about 2.95 mpkwh or some 71 miles range. If the efficiency is higher, say 90%, we are looking at just 63 miles of range (2.6 mpkwh). That looks a little low, given my freeway driving was limited to 55 to 60, even though the temperature was 30 deg and the climate control was consuming about 3 kw. I've seen a figure of 85% for charging (like Prof Bossel).
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

Herm
Posts: 3765
Joined: Sun May 23, 2010 3:08 pm
Delivery Date: 29 Aug 2012
Location: Timbuktu, Mali

Re: What is the Charging efficiency for Leaf ?

Sat Feb 26, 2011 8:07 pm

85% is fairly common, low to mid 90's for a good power supply.. is the charger liquid or air cooled?

User avatar
evnow
Moderator
Posts: 11480
Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

Re: What is the Charging efficiency for Leaf ?

Sat Feb 26, 2011 8:42 pm

Herm wrote:85% is fairly common, low to mid 90's for a good power supply.. is the charger liquid or air cooled?
Charger is liquid cooled.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

JRP3
Posts: 404
Joined: Sat Feb 26, 2011 12:04 pm
Delivery Date: 26 Jun 2015
Contact: Website

Re: What is the Charging efficiency for Leaf ?

Sat Feb 26, 2011 8:44 pm

Does LiMn have lower charging efficiency than LiFePO4? Because I'd expect around 90% or better.

User avatar
evnow
Moderator
Posts: 11480
Joined: Thu Apr 22, 2010 11:41 am
Delivery Date: 25 Feb 2011
Leaf Number: 303
Location: Seattle, WA

Re: What is the Charging efficiency for Leaf ?

Sat Feb 26, 2011 8:50 pm

JRP3 wrote:Does LiMn have lower charging efficiency than LiFePO4? Because I'd expect around 90% or better.
When I say charging efficiency, I'm talking about AC-DC conversion + battery charging i.e. wall to battery.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

JRP3
Posts: 404
Joined: Sat Feb 26, 2011 12:04 pm
Delivery Date: 26 Jun 2015
Contact: Website

Re: What is the Charging efficiency for Leaf ?

Sat Feb 26, 2011 9:18 pm

Right, our PFC's do better than 90% wall to pack.

joaobravo
Posts: 5
Joined: Tue Feb 08, 2011 5:26 am

Re: What is the Charging efficiency for Leaf ?

Fri Mar 18, 2011 9:33 am

In a 3.3kW charging assuming AC-DC 97% efficiency, and low internal battery resistance around 0.005 Ohms the total efficiency could be around 95%.
In a quick charge 50kW (assuming constant power) it would be around 90%.

palmermd
Posts: 2616
Joined: Fri Apr 23, 2010 3:19 pm
Delivery Date: 31 Mar 2011
Leaf Number: 1100011011
Location: Hermosa Beach, CA

Re: What is the Charging efficiency for Leaf ?

Fri Mar 18, 2011 9:39 am

This is going to be hard to calculate without a true SOC meter showing Ah available in the pack. I suppose Turbo could use his laptop to read the value on the CAN to compare to his TED meter on the wall outlet. Phil probably has a way to read the SOC with his instrumentation, but for a regular user without this information it is just guessing.
Michael

Leaf from 31 March 2011 - Traded 18 April 2018 for Tesla Model 3 Unicorn
Driving electric since 1996


Leaf Bar Loss

joaobravo
Posts: 5
Joined: Tue Feb 08, 2011 5:26 am

Re: What is the Charging efficiency for Leaf ?

Fri Mar 18, 2011 9:42 am

Of course this is just a small prediction.

User avatar
EVDRIVER
Moderator
Posts: 6753
Joined: Sat Apr 24, 2010 7:51 am

Re: What is the Charging efficiency for Leaf ?

Fri Mar 18, 2011 11:17 am

The charger should be about 90% efficient.

Return to “Batteries & Charging”