Some Range Learnings from preproduction R1T

jtshaw

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I took a screengrab of the Motortrend video when the driver was cycling through the charging screen.

This was a pre-production truck with AT tires on it. The three pre-set charging levels show ranges of 301 miles, 252 miles, and 200 miles which I assume are roughly equal to 100% charged, 84% charged, and 67% charged.

There is a bunch of things that this doesn't tell us. We don't know if the range is dependant on the current driving mode (or what mode it's in), whether it considers behavior from the past, or whether it considers the current ride height. It does suggest, encouragingly I think, that they thing the lowest range version of the large pack R1T can do 300 miles though.


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aw113sgte

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I can only assume mototrend wasn't allow to share their range experience. Who knows how close this one is to the "production" one.
 

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I like the ability to turn off 120V outlet.
 

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Those values may well have also been hardcoded for the Pre-Prod/Press trucks.

"301" and "200" are awful suspicious to me, especially if it was (like every other system) calculating in past driver behavior and/or Watts/Mile consumption over the last X miles.
 

nfrank

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If the indicator says that the range currently on the batter is 190 miles and it's charging at 15mi/hr for 5hrs 40min:

15mi/hr *5.667hr+190miles = 275 miles

Let's hope that range is rated, but based on driving behavior. Or maybe it is, but this is pre-production. We won't know until real people get it I guess
 
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jjwolf120

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15mi/hr *5.667hr+190miles = 275 miles

Let's hope that range is rated, but based on driving behavior. Or maybe it is, but this is pre-production. We won't know until real people get it I guess
There are other at least two other variables to consider. We don't know what state of charge it is charging to and the charging rate might not be constant all of the way to 100%.
 

sevengroove

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There are other at least two other variables to consider. We don't know what state of charge it is charging to and the charging rate might not be constant all of the way to 100%.
For state of charge, 'Trip' seems to be selected on the menu on the right, so I would assume that's the max available. That leaves charging rate as the remaining variable.
 

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There are other at least two other variables to consider. We don't know what state of charge it is charging to and the charging rate might not be constant all of the way to 100%.
Let us assume charging rate is constant up to 90% and this truck isn't charging higher than that. If it's charging goal is to 80% then the range is 344 miles. If it's charging to 90% then the range is 305 miles.
 

LeoH

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Let us assume charging rate is constant up to 90% and this truck isn't charging higher than that. If it's charging goal is to 80% then the range is 344 miles. If it's charging to 90% then the range is 305 miles.
Also we do not know if this battery is new or has been a test bed for the past few years which might affect the range.
 

Lobstahz

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Gerolsteiner

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This is great stuff. Some spitball guesses here - Assuming the trip charge is 90-100% that suggests that the R1S with these 20” wheels (the worst for range) will have ~310-315mi range and the 21” wheels a bit more than that. (325?) 22” somewhere in between.
 

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There could be a number of things at play. It could be estimating the 5:40 based on the vehicle using all of the 48 amps for charging, but the rate of charge at that moment was only 15 mi/hr because of the overhead for the A/C and seat heater etc. Granted consuming ~4.6 kw for just the A/C should be excessive, but just an example. Bjorn showed an ID.3 pulling 3.1 kw/h just sitting in the cold overnight, and Kris Rifa showed the Etron pulling 2.3 kw at the same time. If you take the 190 + 25mph*5.23 hours you end up at 331 miles. At another point in that screenshot I think you see it pulling "18 mph" with the car on so that would equate to like 292 miles.



Let's come at this from another way:
Let's assume it's it's doing this silly "mph" charge rate computation based on the 301 mile range. Let's also assume that's based on 135 kWh. (conveniently 301 miles/135 kwh *(48amps*240v) =~25 miles charge per hours). You can infer a rated efficiency of 2.22 miles/kwh.

So, 301 miles - 190 miles = 111 miles to charge. At 135 kwh/301 miles that's 49.8 kWh. Over 5.67 hours you'd need to average 8.78 kw (or 19 mph). that 18 mph from another frame in the video is probably that value with the car running and no A/C or heat. Or, subtracting the 2.3 kw consumption overhead Kris observed with the etron from a 220/48 connection and you have 8.2 kw (or 15 mph). If the outlet they're plugged into just happens to run at 205v instead of 240, that drops you down to 9.8 kw. 220v is 10.5kw. So the electrical source could account for most of the variability there as well.


At the end of the day there are a lot of variables, and you can easily walk into how to get to 5h 40 min charge time to get to 301 miles, while also showing 15 mph momentarily.
 
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