150kW Supercharging for Model 3

[SageBrush]

@Zoomit,

I decided to head over to the Albuquerque Supercharger 4a stall (or was it 4b ?) for some testing. A post above suggested that the faster taper than what has been reported in a V3 is due to a thermal limit so I thought it would be useful to see charging speeds on the fuller half of the battery before it, the car electronics, or the supercharger had time to heat up. Unfortunately, I pulled into a spot that had just been vacated so my last requirement was not met although that car stayed for quite a while which suggests that the SC station was working at a low(er) rate for a while.

Tesla Model 3 LR
16k miles
Software 2019.12.1.2
Testing at 77F ambient, 1 kWh driving before Supercharger
Other half of station unoccupied



Google SS:
Sagebrush Supercharger May 2019

RM/322 = SOC    kW
54%    48
56%    44
57%    42
59%    38
61%    37
62%    37
64%    37
65%    37
70%    39
71%    38
73%    39
75%    39
76%    37
78%    37
79%    35
81%    33
82%    31
84%    30
85%    28
87%    26
89%    25
90%    22

 

[Big Earl]

@Zoomit,

I decided to head over to the Albuquerque Supercharger 4a stall (or was it 4b ?) for some testing. A post above suggested that the faster taper than what has been reported in a V3 is due to a thermal limit so I thought it would be useful to see charging speeds on the fuller half of the battery before it, the car electronics, or the supercharger had time to heat up. Unfortunately, I pulled into a spot that had just been vacated so my last requirement was not met although that car stayed for quite a while which suggests that the SC station was working at a low(er) rate for a while.

Tesla Model 3 LR
16k miles
Software 2019.12.1.2
Testing at 77F ambient, 1 kWh driving before Supercharger
Other half of station unoccupied

View attachment 405245

Google SS:
Sagebrush Supercharger May 2019

RM/322 = SOC    kW
54%    48
56%    44
57%    42
59%    38
61%    37
62%    37
64%    37
65%    37
70%    39
71%    38
73%    39
75%    39
76%    37
78%    37
79%    35
81%    33
82%    31
84%    30
85%    28
87%    26
89%    25
90%    22

At 77F and 1 kWh of driving before plugging in, I don't think your battery was warm enough for a proper test.

 

[SageBrush]

At 77F and 1 kWh of driving before plugging in, I don't think your battery was warm enough for a proper test.

Perhaps, but I can think of three reasons why I doubt that is the case:

1. I activated the battery pre-warming routine 2 miles before I reached the supercharger and did not see any increase in consumption so I don't think the car decided to warm the battery.

2. My maximum charge rate was only 48 kW. Even if the battery was only 50 - 60F I think that would have been enough to not limit charging to 48 kWh.

3. The car charge rate tapered from the get go. That would not be the behaviour of a battery that was only limited by temperature.

 

[THX723]

Perhaps, but I can think of three reasons why I doubt that is the case:

1. I activated the battery pre-warming routine 2 miles before I reached the supercharger and did not see any increase in consumption so I don't think the car decided to warm the battery.

2. My maximum charge rate was only 48 kW. Even if the battery was only 50 - 60F I think that would have been enough to not limit charging to 48 kWh.

3. The car charge rate tapered from the get go. That would not be the behaviour of a battery that was only limited by temperature.

48kW @54%SOC looks to be batting way below average. I too think your battery was not sufficiently warmed. Optimal battery charging temperature is believed to begin at ~90ºF. On-Route Battery Warmup draws ~4kW in drive (~7kW parked) or ~1.10ºF/minute. You're 2 miles drive likely took minutes and only raised the battery by a few more ºF from.

Source from the ever informative measurements by Wugz on Reddit.

 

[SageBrush]

You're 2 miles drive likely took minutes and only raised the battery by a few more ºF from.

Sure. I was saying that my Wh/mile did not increase during those two miles -- it stayed at 60 Wh/mile (a slight decline.) I activated it to see if the car thought the battery should be warmed up.

 

[apacheguy]

Perhaps, but I can think of three reasons why I doubt that is the case:

1. I activated the battery pre-warming routine 2 miles before I reached the supercharger and did not see any increase in consumption so I don't think the car decided to warm the battery.

2. My maximum charge rate was only 48 kW. Even if the battery was only 50 - 60F I think that would have been enough to not limit charging to 48 kWh.

3. The car charge rate tapered from the get go. That would not be the behaviour of a battery that was only limited by temperature.

Not sure about the first two points, but I definitely agree with 3. If the pack is cold, the rate should increase over time as it warms up. The fact that it dropped significantly indicates something else was amiss.

 

[Big Earl]

A cold pack will make the taper more aggressive.

 

[mike123abc]

%   KWH
5    60
6    61
7    61
8    65
9    67
10    70
11    79
12    101
13    113
14    114
15    144
16    144
17    145
18    145
19    145
20    145
21    146
22    146
23    146
24    146
25    145
26    146
27    147
28    148
29    148
30    149
31    149
32    149
33    149
34    150
35    150
36    150
37    150
38    150
39    150
40    150
41    150
42    149
43    150
44    149
45    149
46    147
47    143
48    140
49    135
50    131
51    124
52    119
53    116
54    111
55    108
56    104
57    99
58    94
59    88
60    83
61    82
62    80
63    78
64    76
65    75
66    73
67    72

LR AWD. Was 62 degrees, just finished a 90 mile drive (230 overall this morning). I like that it did not go below 100 until 57%. Interesting that it goes up to 145ish and pokes around and does not hit the full 150 until about 10% later.

I videoed it and the KWh is at the start of the percentage.

 

[Zoomit]

Hot damn—Looks like we have a new winner! @mike123abc

I definitely need to add this to the graph.

Was your HVAC off during the session?

 

[mike123abc]

Hot damn—Looks like we have a new winner! @mike123abc

I definitely need to add this to the graph.

Was your HVAC off during the session?

The HVAC was on, but it was 62 outside and I had it set at 68. It was not really doing anything (had been driving 90 minutes so it was at temp).

I did notice the cooling fan kicked into high gear around 50%, loud enough to hear it inside with doors closed. When I heard it running full blast, I turned off the HVAC, but it did not make a difference.

I mostly filmed it (ramp up and down), but I did not have a tripod and it is not the best video.

It was a 25 minute session.

 

[craigcabrey]

Going to do a test of my own today

 

[MarcG]

It was a 25 minute session.

Now we're talking! About 190 miles added in 25 minutes, that's awesome.
A small nit-pick, but in your "code" table of SoC versus Power, you wrote kWh for power -- should be kW
Thanks for adding your data!

 

[mike123abc]

I recorded up to 17 % when I thought it had stopped going up. But, it slowly crept up and I took photos as it went up and a couple of short vids. Then I recorded 39% down waiting for the taper.

 

[Big Earl]

I got a video of my first 150 kW Supercharging session. I started the day with about 41%, drove around a bunch, parked in the sun for a few hours, drive around some more, then navigated to my local Supercharger (Springfield, VA).

I plugged in at 9% and started out around 60kW. The ramp up occurred between 11% and 14%, topping out around 145kW up to 45%. It maintained over 100 kW until 55%. The taper seemed to be slightly more aggressive than in previous sessions, particularly between 55 and 60%.

Items noted: the cooling exhaust air from the Supercharger unit was warm, but not hot. The entire Supercharger cable got warm to the touch. The car did not seem to be overly stressed by the amount of heat, as you can glean from my occasional commentary in the video.

 

[THX723]

Another good data point, @Big Earl. Looks pretty close to @mike123abc. Here's a quick visual ...

 

[Zoomit]

Alright, here we go folks. Another round with a few more datasets. I tried to get some data myself this evening but likely didn't have a warm enough battery. I updated the LR chart with @mike123abc and @Big Earl data. @SageBrush and my charge sessions were too constrained to be noteworthy (but thanks for trying Sage). Also added a "zoom" chart to make it easier to pick out the different lines. I must say that I'm pretty happy with how the @mike123abc data nicely overlaps my predicted taper point! I also updated the SR+ chart with much higher resolution data from @Legen---dary. Enjoy all

 

[SageBrush]

An 'A' for effort.
Great ;-)

@Zoomit,
The data is getting too noisy for me. How about using error bars ?

 

[mike123abc]

The local power plant must fluctuate voltage a lot. Big Earl's display looked much more steady. Mine flickered continuously at this point it would mostly stay 150 but would flash down to 149 for half a second or so, then on occasion flicker up to 151... I took this frame out of the video. It would say 151 for less than half a second off and on (and of course flash down to 149).

 

[Big Earl]

The power differences are interesting. It should be right around 145 kW by the numbers, so it's interesting to see some people getting 150 or even a little higher. I suppose stronger voltage at some sites (closer proximity to big generating stations) could account for the additional power.

 

[mokirtap]

Hello, first time posting here but wanted to share my experience.

I did a first road trip with my SR+ and I just wanted to add new data from my last supercharging. Sorry for the metric units!

Also I did 335 km (208 miles) from 95% to 13% battery which I am pretty happy with.

So I arrived at the Drummondville,QC,Canada SC after a long highway drive but at moderate speed, around 110km/h (68mph) with 13% SOC. Weather was nice, 24°C(75F). Used navigation to SC, am on 19.12.1.2

Max power reached 110kw (best I have seen on SR+) but for very brief moments, most of the time was at 104-105kw with small peaks(that is when I took my pictures so the data is overestimating the speed) before tapering.

My display was in km instead of % but you can divide it by 386km to get the %.

In total I did a 20 min charge and went to 238km of range (61,6%)

This is the data that I retrieved from my pictures, unfortunately I was at the bathroom when it started tapering…


15h42, SOC 12,6-%, start
15h43 SOC 14,5% 70kw
15h43 SOC 15,2% 81kw
15h43 SOC 16% 101kw
15h44 SOC 17% 104kw
15h45 SOC 20% 107kw
15h46 SOC 25% 108kw
15h48 SOC 30% 105kw
15h 48 SOC 31% 110kw
15h49 SOC 35% 104kw

15h56 SOC 51% 69kw
15h58 SOC 55% 60kw
16h00 SOC 59% 51kw