campfamily
Posts: 448
Joined: Tue Apr 21, 2015 8:07 am
Location: Southern California

17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 6:51 am

My car is about to turn over 20,000 miles this week, so I decided to run a battery run-down test once I returned home from work last night. I am showing 17.1 kWh capacity. How does that compare with what other people are seeing at this point?

No problems with the car, just two recalls (software update and modem replacement) and three tire rotations. Averaging right around 247 Wh/mi in mostly highway driving.

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
20,000 miles (since Nov 2018), average 235 Wh/mile

triangles
Posts: 1096
Joined: Tue Aug 16, 2011 11:40 am
Location: Toledo, Ohio

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 8:55 am

I'm at 2 years and just under 10K miles and I get about 18kWh - 18.5kWh. With winter I'm in the upper 300's of Wh/mi. :( What average freeway speeds are you getting just under 247Wh/mi??? I know you said "mostly" so you have some slow driving bringing the number down. With average freeway speeds near 70MPH around here it would be hard to match your numbers doing mostly freeway.
Last edited by triangles on Fri Jan 06, 2017 10:15 pm, edited 1 time in total.
2014 Blue Candy FFE
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jmueller065
Posts: 2398
Joined: Tue Feb 12, 2013 4:36 am
Location: Southeastern MI
Contact: Website

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 9:22 am

Yeah I used to get closer to 275 Wh/mile with freeway driving (and 300+ in winter).
2018 Cajun Red Chevy Bolt
2016 Magnetic C-Max Energi (lease returned)
2014 Sunset Escape
2014 Thor Axis (V-10)
2013 Focus Electric (lease returned Jan 2016 for the C-Max above)
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fbitz777
Posts: 172
Joined: Mon Jul 14, 2014 6:05 am
Location: Wexford, PA

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 10:16 am

I was still getting 20kwh a few months ago at 12,000 miles
Now I am only getting 19Kwh or less at 16000miles. NOTE: if I only get 17Kwh or so at 20,000 then I will be upset.

I know it's colder but I think the fact that I kept depleting it all the time adversely affected the capacity!

Unfortunately I am always running close the limit of the range in my trips...I kind of stopped using the car in the cold as I would run short by a few miles

time to move to the '17 FFE
2014 FFE ..replaced with a 2016 FFE by Ford. Loved it...sold early 2017
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michael
Posts: 1113
Joined: Sun Sep 22, 2013 9:55 am
Location: Los Angeles, CA

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 10:47 am

campfamily wrote:My car is about to turn over 20,000 miles this week, so I decided to run a battery run-down test once I returned home from work last night. I am showing 17.1 kWh capacity. How does that compare with what other people are seeing at this point?

No problems with the car, just two recalls (software update and modem replacement) and three tire rotations. Averaging right around 247 Wh/mi in mostly highway driving.

Keith
That's right in line with my experience.
2013 FFE Returned after 3 years with 52,000 miles and battery down to 15.2 kWh
2014 Volt returned with 43,000 miles
2014 Volt 26,000 miles
1967 Corvette 427
1962 Corvette 327
Awaiting a Bolt

cpwl
Posts: 71
Joined: Fri May 09, 2014 5:35 am
Location: Gatineau, QC, Canada

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 11:01 am

Ok, Yes I should know this after 18 months plus with Montgomery but what screen displays the battery capacity and what is the “buttonology” to get there? I’ve looked through the readily accessible screens several times and have yet to find this information. Obviously I’m missing something quite “simple” and I suppose I really should know my current battery capacity and monitor it even though it "seems" to be giving me the original range and charging performance.

Thanks and Cheers
Carl

campfamily
Posts: 448
Joined: Tue Apr 21, 2015 8:07 am
Location: Southern California

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 12:16 pm

cpwl wrote:Ok, Yes I should know this after 18 months plus with Montgomery but what screen displays the battery capacity and what is the “buttonology” to get there? I’ve looked through the readily accessible screens several times and have yet to find this information. Obviously I’m missing something quite “simple” and I suppose I really should know my current battery capacity and monitor it even though it "seems" to be giving me the original range and charging performance.

Thanks and Cheers
Carl
Carl - here's what I did. I reset one of my trip odometers (I do this every Monday anyway, after recording the data from the previous week). Then, I drove to work and back. I still had about 15 miles range remaining. So, I parked the car in the garage, rolled the windows down, and turned the heater up to full blast. I left the car "running" in the garage while I had dinner in the house. When I was done, the car showed 1 mile remaining. At 0 miles remaining, I noticed the heater stopped blowing hot, and the energy useage screen showed that the Climate control was no longer using power. The car showed that it had consumed 17.1 kWh. So, I figured this was the max capacity that the battery had (maybe an extra tenth or two remaining, but not worth it to me to go any further).

For average consumption, I track my electrical consumption on a weekly basis using the trip odometers.

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
20,000 miles (since Nov 2018), average 235 Wh/mile

michael
Posts: 1113
Joined: Sun Sep 22, 2013 9:55 am
Location: Los Angeles, CA

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 2:23 pm

You might (or might not, I'm not sure) get a slightly different answer if you used the heater to do the entire rundown (from fully charged). The reason it might be different is that this approach uses a constant load, about 6 kW. Driving adds the variable of changing power loads and regeneration.

For laughs, you might try it once with a pure heater drawdown, compare the result.
2013 FFE Returned after 3 years with 52,000 miles and battery down to 15.2 kWh
2014 Volt returned with 43,000 miles
2014 Volt 26,000 miles
1967 Corvette 427
1962 Corvette 327
Awaiting a Bolt

WattsUp
Posts: 2113
Joined: Mon Jan 07, 2013 2:58 am
Location: SF Bay Area, CA

Re: 17.1 kWh @ 20,000 miles

Thu Jan 05, 2017 9:50 pm

michael wrote:Driving adds the variable of changing power loads and regeneration.
True, but the energy measured by the trip meter will indeed "run backwards" due to regeneration (or charging), so the net result should still reflect total energy used. In theory, the "extra variables" should not matter.

I do agree, though, simply running the entire battery down via the heater is a more "constant" approach. But, I don't think anybody has any idea whether it produces a more accurate answer than just driving around to deplete the battery.

Probably any two "run-down" tests are more affected by ambient temperature than anything else. Possibly driving around will also affect internal and (clearly) external temperatures.

The best bet is to do a few run-down tests under similar circumstances and average them.
2013 FFE, Platinum White, Delivered January 2013
2017 MS, Midnight Silver Metallic, Delivered February 2017
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michael
Posts: 1113
Joined: Sun Sep 22, 2013 9:55 am
Location: Los Angeles, CA

Re: 17.1 kWh @ 20,000 miles

Fri Jan 06, 2017 11:19 am

Agreed... I said that it wasn't clear there would be a significant difference.

However, the run forward-run backward is not symmetrical. Each round trip energy is lost to heat, it's not zero sum. For example, if you regen 1 kWh, the battery will not gain that full 1 kWh but rather something less. Unless, of course, the trip meter has a fudge factor to adjust for this. Does it? Who knows?

Enough to notice? I don't know...that's why I said "maybe" and why I suggested a test. And, as you pointed out, temperature is important. Ideally this should be done with battery at or near 98 F
2013 FFE Returned after 3 years with 52,000 miles and battery down to 15.2 kWh
2014 Volt returned with 43,000 miles
2014 Volt 26,000 miles
1967 Corvette 427
1962 Corvette 327
Awaiting a Bolt

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