adnan1980
Posts: 19
Joined: Mon Jun 08, 2015 12:48 pm
Location: Dallas, Texas

Re: Max kWh on new 2017 pack?

Thu Nov 30, 2017 2:55 pm

davideos wrote:After I had my 2012 battery replaced with a 2017 battery, I used the trip-o-meter to determine the battery capacity to be 30KWhs. I recently completed a round trip of 92miles with 10 miles to spare. Relatively flat ground at a constant 65mph. My 2012 battery did suffer significantly from degradation...at least 15% over 4.5 years and 45k miles.
davidoes : How does the battery meter look when you had 15% degradation, does it like not show up fully charged? I am at 47500 miles on my 2015 FFE, I am trying to see if any degradation, I am not sure how to truly figure it out. When I run battery health it says good.
2015 Focus Electric Tectonic Region 4 adnan1980

tkdbrusco
Posts: 19
Joined: Mon Nov 20, 2017 9:13 am

Re: Max kWh on new 2017 pack?

Thu Nov 30, 2017 9:11 pm

spirilis wrote:The calculated value I was getting at 5K miles was ~28.08kwh or so. Haven't done a run-down test yet. It's already at 12K now... on target to do probably 30K by the end of the 1st year!
Just ran mine using the Forscan app and here's what I got. I think I was actually at 99% for some reason. Probably cause the car had been sitting at 100% charge for about 10 hours and I had pulled it out of the garage and moved it around for us to charge our Leaf...

Anyways, found how to get the readings in the App and it was 27.85 kWh at 99%, which should correspond to about 28.13 at 100% or just about what you had after 5K miles. From what others were saying, there's no way that this car has 10% buffers above and below. First and foremost, I found a setting in the app that gave me total charge and it was just over 93% (when the car was displaying 99%), so call it 6-7% top buffer. 28.13 as a ratio of 33.5 is 84%, so that's about 16% extra split between the top and bottom of the pack.

What I find strange is the amount of power it takes when charging compared to what I've actually used. For example, I drove to work today just after taking the reading and left home with 99% and arriving to work with 74% (25% decrease) but the car took 9.19 kWh from the charger while I was there to get back to 100% charge. Well that corresponds to 36.76 possible if charged from 0-100%. Granted I know that when plugged in it will pull power for other purposed and be less than efficient for cell balancing, etc... Just wondering why the extra draw if I clearly didn't use 9.19 kWh to get from home to work. According to myfordmobile I drew 7.7kwh over that same distance.

I don't want to get crazy with these stats like I was with my Leaf. My main goal is to get a baseline and then to measure my degradation over the three years of leasing the car. If my degradation is <8% or so at 45k miles, I'll consider buying it at lease end, but if it's >10% maybe not. My leaf degraded by 11% between the day I bought it and the 54K miles and 3.5 years I drove it.

bettyinverter
Posts: 1
Joined: Thu Nov 30, 2017 10:16 pm

Re: Max kWh on new 2017 pack?

Thu Nov 30, 2017 10:22 pm

hi, everybody, i am a new memeber, also interested in Focus cars, but not know much about the car. I hope to learn more from here.

Betty
http://www.yiyen.com

campfamily
Posts: 438
Joined: Tue Apr 21, 2015 8:07 am
Location: Southern California

Re: Max kWh on new 2017 pack?

Fri Dec 01, 2017 7:03 am

tkdbrusco wrote:
spirilis wrote: What I find strange is the amount of power it takes when charging compared to what I've actually used. For example, I drove to work today just after taking the reading and left home with 99% and arriving to work with 74% (25% decrease) but the car took 9.19 kWh from the charger while I was there to get back to 100% charge. According to myfordmobile I drew 7.7kwh over that same distance.
Don't forget that the charging process is not 100% efficient. For each kWh you take from the charger, you should only expect about 85% of that to actually end up "filling" your battery. 9.19 * .85 = 7.81.....

Keith
GONE - 2015 FFE, Magnetic with leather interior, debadged & tinted
38,500 miles (since May 2015), average 246 Wh/mile

REPLACED WITH - 2018 Tesla Model3, LR RWD, Obsidian Black
11,000 miles (since Nov 2018), average 235 Wh/mile

spirilis
Posts: 154
Joined: Fri Jul 14, 2017 4:53 am
Location: Maryland

Re: Max kWh on new 2017 pack?

Fri Dec 01, 2017 7:13 am

campfamily wrote:
tkdbrusco wrote:
spirilis wrote: What I find strange is the amount of power it takes when charging compared to what I've actually used. For example, I drove to work today just after taking the reading and left home with 99% and arriving to work with 74% (25% decrease) but the car took 9.19 kWh from the charger while I was there to get back to 100% charge. According to myfordmobile I drew 7.7kwh over that same distance.
Don't forget that the charging process is not 100% efficient. For each kWh you take from the charger, you should only expect about 85% of that to actually end up "filling" your battery. 9.19 * .85 = 7.81.....

Keith
Yeah I figured that out eventually... and at least during the hot weather, DC fast charging at 125A ends up being only ~80-82% efficient (probably due to the chiller running a lot).
edit: lol I didn't write that apparently, but the quote made it look like I did? Either way... good to know
2017 Ford Focus Electric (Magnetic)
2017 Ford C-Max Energi SE (Kona Blue)

cecil-t
Posts: 37
Joined: Thu Dec 28, 2017 3:16 pm
Location: PA

Re: Max kWh on new 2017 pack?

Mon Jan 15, 2018 4:11 pm

I don't think there is a built-in "buffer zone" like people think. I think it's the difference between the max kWh rating and the nominal rating. Nominal is what you'll actually see / measure. Battery guys I talk to in the industry seem to feel the max rating is pretty much a made up number for the purposes of claiming tax credits and such. I mean not literally made up but it doesn't relate to the usable capacity in any sense. That's the one manufacturers advertise.
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2017 Ford Focus Electric
2014 Zero S (motorcycle)

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