CHARGING IN THE WINTER

[21st Century Truck]

Completed the weekly charging of my Lightning just now, 45% to 90% took about 3.6 hours.
Emporia log shows 70.27 kWh for all of today's activities, conditioning battery, cabin and charging.
The FCSP log shows 69.995 kWh and ~$27.30 cost.

My weekly driving amount to a whopping 62 miles, lot's of departure timed warming or remote starts to ensure a comfortable ride for Mrs. Taxman, my miles per kWh {0.9} drops through the floor in winter for these reasons, resulting in 44.2 cent per mile cost of driving, which is well above my old PowerStroke, but the creature comforts of a warm vehicle is a winner with the Lightning, the old diesel was cold blooded beast in winter.

Some health statistics for the battery pack just after finishing the charging session.
The heat from earlier in the morning and heat generated during charging maintained well, it will be interesting to see how much is lost by Monday morning, we will be driving the Mrs. ICE vehicle Sunday. SOH is 98.5%, the LVB has been topped up to 99%, will be interesting to see where that's at Monday as well, I'm leaving the OBD2 plugged in to see if that causes severe impact.

The gross energy stored on the HVB is calculated to be 83% vs. dash indication of 90%
GOM range value of 270 miles imputed 100% value would be about 300 miles out of 320 theoretical miles, which we all know is impossible in this climate, especially how I operate and drive my truck.

Yes, the drop in the retained heat curve within the traction battery will be of interest. I have a SWAG estimate but I'll hold my fire to see how far off my SWAG will be. Thanks for doing this.

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[RickLightning]

Completed the weekly charging of my Lightning just now, 45% to 90% took about 3.6 hours.
Emporia log shows 70.27 kWh for all of today's activities, conditioning battery, cabin and charging.
The FCSP log shows 69.995 kWh and ~$27.30 cost.

Interesting the discrepancy between the FCSP log and Emporia. I think it shows that Emporia isn't exactly accurate, measuring with the clip on connectors.

69.995/70.27 = .996

 

[P-38]

Interesting the discrepancy between the FCSP log and Emporia. I think it shows that Emporia isn't exactly accurate, measuring with the clip on connectors.

69.995/70.27 = .996

I think the Emporia is accurate. Probably capturing power loss due to voltage drop losses between the Emporia connection point and the FCSP.

ASSuming Taxman's setup pulled exactly 80 amps and that it was 4awg wire...his charger is about 5 foot of wire away from his emporia. Please note exactly 80 amps is a large assumption and I have ignored termination points.

 

[TaxmanHog]

Yes, the drop in the retained heat curve within the traction battery will be of interest. I have a SWAG estimate but I'll hold my fire to see how far off my SWAG will be. Thanks for doing this.

This morning at ~07:30 am, just before departure time start began, about 36 hours of cold soak.
The LVB SOC dropped 10%, 10 amps outflow for lights and running modules, the ambient and outdoors temps is a data error which will correct with another unlock command.

The truck started warming up around 07:33 am, the PTC (coolant heater) is drawing 8.47 KW, interior temp is 35.6°, most traction temperatures are still chilly, note that I'm unplugged so we should not see the HVB temps go up. The LVB is recharging at 13.25v

HVB thermal mode remains off as expected.

Tuesday 12/9 I will pull data for the anticipated 11° cold soak.

 

[TaxmanHog]

I think the Emporia is accurate. Probably capturing power loss due to voltage drop losses between the Emporia connection point and the FCSP.

ASSuming Taxman's setup pulled exactly 80 amps and that it was 4awg wire...his charger is about 5 foot of wire away from his emporia. Please note exactly 80 amps is a large assumption and I have ignored termination points.

I have never seen 80 amps in real time, mostly I will see 75 to 77 amps measured by Emporia.

The wire length from the load center in the motorcycle shop to the EVSE in the truck/car garage is about 24 feet, wire size is copper appropriate for 100 amp breaker with continuous max load of 80 amps.

 

[TaxmanHog]

Interesting the discrepancy between the FCSP log and Emporia. I think it shows that Emporia isn't exactly accurate, measuring with the clip on connectors.

69.995/70.27 = .996

This sample was out of the norm, usually the Emporia measures a few more watts than the FCSP.

Here is a list of recent charging sessions showing the random variation.

The 12/06 entries are the departure timed warming of the battery and cabin first then the end of week charging session.

 

[TaxmanHog]

December 8th about 5PM when I parked the truck in the garage for the night these were the conditions, note that it had been sitting outside in the driveway for about 90 minutes since the last drive. Exterior temp is 26.6°, the HVB is still holding some of the mornings battery prep warming at 32-35.6°, the coolant temp is 181.4 from the move to the garage.

The departure times main switch was turned off in the Sync screen, and 'Home' charging parameters was changed from 90% to 50% SOC to prevent charging while plugged in, I wanted to eliminate any heat generated from either activity.

Dec 9th at 06:35 am, the temperature outside is 14° but the truck is reporting the garage temp is around 23° per car scanner data, as you see the temp's in various systems have chilled overnight, but the HVB is showing slightly warmer!!

The Lightning decided it needed a little dose of energy to warm the battery at 11:56 PM the warming cycle ran until 00:09 AM, total run time ~13 minutes, using 1.61 kWh of energy, the PTC ramped up to around 8KW energy draw.

The FCSP measured 1.61 kWh of energy

The tests I did last year, showed spontaneous warming cycle lasting similar time frames, I don't recall it repeating more than once over night, but folks living in ]brutally cold areas may observe longer and more frequent cycles.

 

[PJnc284]

did you happen to get readings on what the temps were after?

 

[TaxmanHog]

did you happen to get readings on what the temps were after?

I wasn't awake at the time to sample the pack temp's immediately after the warming cycle completed, it's hard to predict when this activity will occur, in the past it's happened at various times, I could pull an all night Emporia watch to see what the values are when the next severe cold night comes around. Next opportunity is Monday the 15th, with another 11 degree morning.

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