Kermit
Posts: 61
Joined: Mon Feb 04, 2019 10:47 am

Re: Questions and Data tracking

Fri Aug 16, 2019 12:06 pm

I had my GOM range down to 11 miles with the last bar flashing yellowish/orange for the first time by forgetting to plug in several times this week.
When I got home I used Torque pro to read the individual cell voltages and they were at 3.50 volts and it was showing 10% battery charge left.

With the cells at 3.50 Volts the discharge is at about 95%. So the upper and lower end buffer on what is usable in the battery is only about 3% on both ends from my measurements. These voltages are the same as our Gen 2 Volt.

I wanted to add that when my car got low enough to ask if I wanted to turn the radio off that it did not cool the battery even though it was hot outside and has been cooling when properly charged every day.
2016 Spark EV

Kermit
Posts: 61
Joined: Mon Feb 04, 2019 10:47 am

Re: Questions and Data tracking

Thu Sep 12, 2019 8:26 am

Data from this month's 100% charge (September.)
Previous Charge to 100% was 92 miles. This charge to 100% and the GOM is at 99 miles.
Previous Charge to 100% kWh was 16.5666676. This charge to 100% and the kWh remained at 16.5666676 kWh (odometer is at 15,279). The average was 5.4 mi/kWh this past month over 451.5 miles.
Temperatures have been in the upper 90's with car reading over 100F most days.
I was seeing as high as 7+mi/kWh in the mornings when the car didn't need battery cooling and as low as 3.1mi./kWh when the car was hot from sitting in the sun all day.

Fuel is $2.29/ gallon here now and electricity is $0.074 per kWh so I am getting about 125.3 miles out of what it costs for a gallon of gas right now (after assuming 75% efficiency of the electricity actually into the battery.)

181.98 MPGe (1 Gallon of Gas = 33.7kWh)

Energy Details before the full charge showed:
67% Driving and accessories, 10% climate setting, 9% battery conditioning with 84.0 kWh used.
2016 Spark EV

Kermit
Posts: 61
Joined: Mon Feb 04, 2019 10:47 am

Re: Questions and Data tracking

Fri Sep 27, 2019 1:52 pm

Today torque shows my capacity has gone up again to 16.733333 kWh
2016 Spark EV

Kermit
Posts: 61
Joined: Mon Feb 04, 2019 10:47 am

Re: Questions and Data tracking

Wed Oct 09, 2019 12:06 pm

Data from this month's 100% charge (October.) 10/05/19
Previous Charge to 100% was 99 miles. This charge to 100% and the GOM is at 108 miles.
Previous Charge to 100% kWh was 16.5666676. This charge to 100% and the kWh went up to 16.7333336 kWh (odometer is at 15,771). The average was 5.8 mi/kWh this past month over 492.4 miles.
Temperatures have still been in the 90's with car reading over 100F most days but some days were cooler this past month.

Fuel is $2.39/ gallon here now and electricity is $0.074 per kWh so I am getting about 140.5 miles out of what it costs for a gallon of gas right now (after assuming 75% efficiency of the electricity actually into the battery.)

195.46 MPGe (1 Gallon of Gas = 33.7kWh)
2016 Spark EV

Kermit
Posts: 61
Joined: Mon Feb 04, 2019 10:47 am

Re: Questions and Data tracking

Fri Nov 01, 2019 10:13 am

Today's battery capacity reading was 16.5 kWh via EngineLink.
A couple other data points since we have now had our first night of below freezing temperatures (our car is parked outside not in a garage.)
When the car is remote started while plugged in it will heat the battery to 12C (53.6F) before the battery heater turns itself off.
When the battery was hot it would cool the battery to 28C (82.4F) before the battery coolant pump would shut off.
Last edited by Kermit on Wed Nov 13, 2019 11:41 am, edited 1 time in total.
2016 Spark EV

RSC
Posts: 38
Joined: Thu Sep 20, 2018 5:45 am

Re: Questions and Data tracking

Sat Nov 02, 2019 7:11 am

November readings (previously posting in another thread):

Date.......... Miles. Capacity (kWh)
05/5/2019 18601 16.1
06/1/2019 18905 15.9
07/3/2019 19259 15.9
08/1/2019 19669 16.3
09/1/2019 19878 16.4
10/2/2019 20190 16.0
11/1/2019 20611 16.0

Looks like the increase to 16.4 kWh was temporary.
Ray
2015 Spark EV 1LT, DCFC

MrDRMorgan
Posts: 1015
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Questions and Data tracking

Sat Nov 02, 2019 1:40 pm

RSC wrote:
Sat Nov 02, 2019 7:11 am
November readings (previously posting in another thread):

Date.......... Miles. Capacity (kWh)
05/5/2019 18601 16.1
06/1/2019 18905 15.9
07/3/2019 19259 15.9
08/1/2019 19669 16.3
09/1/2019 19878 16.4
10/2/2019 20190 16.0
11/1/2019 20611 16.0

Looks like the increase to 16.4 kWh was temporary.
I think the temporary jump may be mostly due to warmer ambient temperature. I saw a similar temporary jump last year too. But.... the overall trendline is still in a downward direction.
May 2019 - 18665 miles 15.4 kWh
July 2019 - 22476 miles 15.8 kWh
Nov 2019 - 25918 miles 15.2 kWh

Kermit
Posts: 61
Joined: Mon Feb 04, 2019 10:47 am

Re: Questions and Data tracking

Wed Nov 13, 2019 12:02 pm

Kermit wrote:
Fri Nov 01, 2019 10:13 am
Today's battery capacity reading was 16.5 kWh via EngineLink.
A couple other data points since we have now had our first night of below freezing temperatures (our car is parked outside not in a garage.)
When the car is remote started while plugged in it will heat the battery to 12C (53.6F) before the battery heater turns itself off.
When the battery was hot it would cool the battery to 28C (82.4F) before the battery coolant pump would shut off.
We've had some cold nights (last night was 17F) and I have been looking to see if the battery heater was on while charging. The battery heater did not come on until I remote started the car to condition it this morning (~8am with departure set for 2PM which gets me to about 86% charged and closer to 80% charged after a remote start). I believe it must have come on at sometime because the outside air temp according to the car was 25.7F and the battery temp was 2C (35.6F) (Battery coolant temp was 33.8F). After the remote start it got up to 12C (53.6F) before turning off the battery heater.

I returned home from a short trip (still below freezing temps) and plugged it in to keep it charging while I was working on something else and when I checked again at 1PM the battery heat was on and the temperature was at 12C (55.4F on torque pro) as it approached 94% charged (again set at a 2pm departure.)

Compared to our Gen 2 Volt it's battery temp was 59F as it was nearing the end of it's charge.

It is interesting to see how low of a temperature it will charge at. The next night it is below freezing I will do an immediate charge instead of delayed to confirm if the battery heat turns on to get it to 2C and if it shuts off there or continues to heat or just just turns off until it nears the end of the charge.

With the car sitting out in the cold and not plugged and running the remote start the battery heater did not turn on with the battery reading was 3C.
2016 Spark EV

SparkE
Posts: 342
Joined: Tue Sep 06, 2016 1:18 am
Location: SF Bay Area (San Jose, CA)

Re: Questions and Data tracking

Wed Nov 13, 2019 11:01 pm

Shamelessly stolen from another forum :
Temperature has a large effect on the relative capacity of the cells. Take a Samsung ICR18650-26F cell as an example - not the same cells used in the Bolt but it is a Lithium based cell. The official datasheet from Samsung specifies the 100% capacity rating at 25C, but when the temperature is 0C (32F) or 40C (104F) the relative capacity drops to 80%. At -10C (14F) the capacity drops to 50%. If you want to log relative capacity data for the pack you also need to record the cell temperature because the relative capacity data will be skewed if the temperatures are all over the place.
So, I suggest that people collecting data on their EV batteries (with Torque Pro or similar) also start recording the cell temperature when the reading was taken.

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