P85D trip SF-Portland: detailed data on range and charging

MarcG · Dec 25, 2014

Merry Christmas everyone!

Today I took my first long trip in the P85D from San Francisco to Portland.
The goal of this thread is to dissect the detailed data I gathered on each driving leg and charging session in order to analyze the P85D real-world range.

First, a few common points to all the data points collected:

1. Software version was updated to v6.0 (2.0.81) just before the trip started
2. The trip started with 100% charge showing 252 Rated Miles (RM)
3. I have the base 19" wheels with Michelin Primacy tires
4. My P85D has a sunroof that was fully-closed the whole trip
5. No roof rack was installed on the sunroof during the trip, although I did bring it for later
6. Payload was about 500 lbs (two adults, ski/snowboard gear, etc.)
7. Average speeds are recorded below based on distance traveled divided by driving time
8. The goal was to stay at 10 mph over the speed limit (which varied a bunch) using cruise control
9. My girlfriend drove the last sting and she didn't use cruise control (and drove slightly slower than me)
10. No other stops were made besides supercharing
11. Net elevation difference is in feet

With all that out of the way, here is finally the promised data!

From

To

Miles

Depart

Arrive

Avg mph

Avg temp

RM used

kWh used

Wh/mi

Net elev ≠

Weather

Heating

San Francisco

Corning SC

172.3

9:09

11:31

72.80

12ºC/54ºF

250

74.6

433

26

Dry/sunny

None

Corning SC

Mt Shasta SC

108.7

12:22

1:49

74.97

11ºC/52ºF

176

52.4

482

3218

Dry/sunny

21ºC/70ºF

Mt Shasta SC

Grants Pass SC

118.6

2:26

4:05

71.88

4ºC/39ºF

149

44.3

373

-2401

Wet/Snow/Rain

21ºC/70ºF

Grants Pass SC

Springfield SC

140.1

5:13

7:09

72.47

7ºC/45ºF

192

57.2

408

-666

Dry/dark

21ºC/70ºF

Springfield SC

Portland

108.7

7:41

9:15

70.21

7ºC/45ºF

136

40.6

374

-197

Dry/dark

21ºC/70ºF

And here are the charging stats:

Supercharger	RM start	RM end	RM chg	Energy	Chg time	Chg rate	Temperature
Corning	2 (1%)	202 (90%)	200	59.56 kWh	0:49	72.93 kW	13ºC/55ºF
Mt Shasta	26 (10%)	177 (70%)	151	44.88 kWh	0:35	76.94 kW	9ºC/49ºF
Grants Pass	28 (11%)	240 (95%)	212	63.26 kWh	1:06	57.51 kW	6ºC/43ºF
Springfield	48 (19%)	175 (69%)	127	37.90 kWh	0:30	75.79 kW	11ºC/52ºF

Some interesting findings:

A) Charging to 100% yielded slightly over 250 RM, so I based my SOC % calculations on 252
B) The four trips all indicate that the useable energy is 75.2 kWh
C) Overall consumption seems to be around 400 Wh/mi on average
D) Charging until around 50% emits a loud fan noise under the frunk (cooling the battery?)

There you go, hope this helps!
Now, feel free to discuss away :biggrin:

-Marc

Vger · Dec 25, 2014

I just did that drive myself a few days ago in my Sig P85. I do not have a detailed log, but I recall that while I drove slightly slower (probably averaged 70 mph), more than 50% was in rain, and I averaged about 320 Wh/mi.

Hmmm, it does seem that the P85D is significantly less efficient still at this point.

I dare say, it was a bit risky of you to skip the Vacaville SC and run the car all the way down to 2 RM. The battery calibration can vary. Mine was recently out of whack and I experienced a full shutdown at 2 RM. That is another story to be posted soon...

Burt Court · Dec 25, 2014

You charge quickly, eat slowly (if that's why your stops were so long). My kids now have my S-85, my D comes in next week. Look forward to same kind of trip more southernly.
old geezer

jweinstein · Dec 25, 2014

MarcG said:
B) The four trips all indicate that the useable energy is 75.2 kWh

-Marc

Thanks, Marc!

Does the usable 75.2 kWh include any hidden miles below zero, or is that still a mystery?

I keep going back to this chart/hypothesis:

-Josh

MarcG · Dec 26, 2014

Vger said:
I dare say, it was a bit risky of you to skip the Vacaville SC and run the car all the way down to 2 RM. The battery calibration can vary. Mine was recently out of whack and I experienced a full shutdown at 2 RM. That is another story to be posted soon...

Good to know, thanks! Curious to hear about your 2 RM shutdown at some point.

As for the point about risking the Vacaville skip, I kept a close eye on projected range vs remaining miles from the very beginning of my 80 mph run.
i figured that it would be easy to adjust down to 75, 70, or even 65 mph if I got too close. Didn't need to in the end

- - - Updated - - -

Burt Court said:
You charge quickly, eat slowly (if that's why your stops were so long). My kids now have my S-85, my D comes in next week. Look forward to same kind of trip more southernly.
old geezer

Well, besides the Grants Pass where we actually ordered a meal, all the other stops were just made long enough to charge to a level where I was comfortable knowing we'd make it to the next supercharger while driving 10 mph over the speed limit.

- - - Updated - - -

jweinstein said:
Thanks, Marc!

Does the usable 75.2 kWh include any hidden miles below zero, or is that still a mystery?

I think it's still a mystery. I'd like to know the origins of this chart and how it applies to the P85D, if at all.

tom66 · Dec 26, 2014

MarcG said:
I think it's still a mystery. I'd like to know the origins of this chart and how it applies to the P85D, if at all.

I'm not sure that graph is correct.

~76kWh is the usable capacity.

~80kWh is the design capacity. This is the maximum discharge point, at which the contactors will probably disengage to protect the pack. Or it's the point at which Tesla declare the pack beyond repair if it's been deep discharged.

~85kWh is the capacity when using the raw Ah figure x 3.7V x number of cells. Purely theoretical.

Zero mile figure is hidden by elevating Wh/mile. So the 265 mile range for S85 includes the zero mile protection, but the internal Wh per mile is set slightly lower so that if you go at the rated Wh/mile you will hit zero miles after travelling ~250 miles, at that point the pack is nearly fully discharged and is likely to stop driving the car shortly.

Burt Court · Dec 26, 2014

Sorry Marc, I was mixing up arrive and depart times in the upper chart. Will learn how to do this soon, I hope.
old geezer

WarrenInCA · Dec 26, 2014

Hey Marc, where are you skiing?

MarcG · Dec 26, 2014

WarrenInCA said:
Hey Marc, where are you skiing?

Mt Hood and Mt Bachelor!

MarcG · Jan 2, 2015

Happy new year everyone!

I'm back in SF and have more data to share:

From	To	Miles	Depart	Arrive	Avg mph	Avg temp	RM used	kWh used	Wh/mi	Net elev ≠	Weather	Heating
Portland	Detroit Lake	56.2	2:29	3:35	51.1	4ºC/39ºF	91	27.0	480	1,289	Wet/Rain	21ºC/70ºF
Detroit Lake	Bend	78.6	4:16	5:53	48.6	1ºC/34ºF	125	37.5	477	1,922	Wet/Snow	21ºC/70ºF
Bend	Klamath Falls	136.0	9:29	12:01	53.7	-12ºC/10ºF	167	49.7	365	613	Snow/Sunny	21ºC/70ºF
Klamath Falls	Mount Shasta	84.9	1:15	2:35	63.7	-3ºC/27ºF	104	30.5	359	-640	Wet/Sunny	21ºC/70ºF
Mount Shasta	Corning	109.1	3:15	4:43	74.4	5ºC/41ºF	121	35.3	323	-3,218	Dry/Sunny	21ºC/70ºF
Corning	Vacaville	113.7	5:18	6:51	73.4	8ºC/46ºF	146	43.7	384	-177	Dry/Dark	21ºC/70ºF
Vacaville	San Francisco	58.1	7:30	8:21	68.3	11ºC/52ºF	72	21.5	370	151	Dry/Dark	21ºC/70ºF

It got really cold in Bend the last 2 days we were there... great for the snow though!

And here are the charging stats:

Supercharger	RM start	RM end	RM chg	Energy	Chg time	Chg rate	Temperature
Detroit Lake	10 (4%)	189 (75%)	179	53.23 kWh	0:39	81.89 kW	2ºC/36ºF
Mt Shasta	12 (5%)	179 (71%)	167	48.98 kWh	0:38	77.33 kW	0ºC/32ºF
Corning	58 (23%)	187 (74%)	129	37.83 kWh	0:32	70.93 kW	9ºC/48ºF
Vacaville	41 (16%)	186 (74%)	145	42.52 kWh	0:35	72.90 kW	12ºC/54ºF

kennedyseattle · Jan 4, 2015

Thanks Marc for posting this data. Did you also charge up in Bend and/or Klamath Falls? If so could you share details? Thank you!

MarcG · Jan 5, 2015

Yep I charged several times in Bend using the Tesla HPWC at the hotel we were staying at. I didn't record those charging events but remember I got at most just under 17kW (208V x 80A) of charge rate.

As for Klamath Falls, I stopped at an RV park and used one of their NEMA 14-50 plugs. I charged for 1 hr 7 min at an average rate of 8.26 kW, so I got a total of 9.23 kWh (31 rated miles). The ambient temperature was -4ºC / 25ºF.

stevezzzz · Jan 5, 2015

Even with descending 3200' over 109 miles I see you didn't manage to achieve Rated range: we really need Normal mode!

MarcG · Jan 5, 2015

Yep, Normal mode / torque sleep mode can't come soon enough. Although, I wonder what ambient temperature rated miles are based on (in my case it was still pretty cold, just over freezing).

DrGuest · Jan 5, 2015

MarcG said:
Mt Hood and Mt Bachelor!

Off Topic - Let me know if you ever come to Big Sky or Bridger Bowl in Montana, I can show ya around. We got 19 inches Yesterday at Bridger, they call our Powder snow, the Cold Smoke! Good quality light stellar dendrites!

Zextraterrestrial · Jan 5, 2015

DrGuest said:
Off Topic - Let me know if you ever come to Big Sky or Bridger Bowl in Montana, I can show ya around. We got 19 inches Yesterday at Bridger, they call our Powder snow, the Cold Smoke! Good quality light stellar dendrites!

:love: jealous

(I am planning on Bachelor the first week of February, hopefully it's cold)

MarcG · Jan 5, 2015

Definitely jealous as well!!

I'd like to first try the drive out to SLC if/when they ever put the superchargers on 80 in Nevada.

Then maybe a trip to Montana from there is possible

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P85D trip SF-Portland: detailed data on range and charging

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