R2 prototypes spotted in Moab, charging at Tesla supercharger

[VandalSibs]

Very few today, but there will probably be more in the coming years. I've stopped at a few curbside chargers in Kansas City.

The front-end also allows for chargers in diagonal parking stalls. Those are fairly common, and you don't back into those.

You say that as I walk past two curb side chargers next to my work building lol.

My apologies, I didn't mean to imply that curbside charging was a bad idea - they are just much more of a Europe thing. Which considering R2 will eventually make it there would be nice, but they are currently designing for the market they are selling in...

Port location is also based on proximity to one of the motors (so that AC charging can use the inverter to charge the DC pack), and the single motor version of R2 is going to be rear-wheel drive. Saves on copper not having to run extra HV wiring from a front port to a rear motor.

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[JeepEVer]

I want my R2 "trail rated" ... it's a Jeep thing!

 

[Ilovejunebugs]

Pack has 768 cells split across three modules. Only way to configure this less than 500V per module means 8s32p to hit the 256 cells per module. Max charging voltage at 4.2V per cell means it's 403.2V max. 403.2V * 500A is 201.6kW, but charge rates never really hit the max voltage here, so I'm guessing it's probably more like 180kW max charging. Which, with higher efficiency, probably fairly close to R1 at a percentage or mileage based rate.

I'll wait to see the official specs but this would be very disappointing to me, if it was the case.

 

[VandalSibs]

Pack has 768 cells split across three modules. Only way to configure this less than 500V per module means 8s32p to hit the 256 cells per module. Max charging voltage at 4.2V per cell means it's 403.2V max. 403.2V * 500A is 201.6kW, but charge rates never really hit the max voltage here, so I'm guessing it's probably more like 180kW max charging. Which, with higher efficiency, probably fairly close to R1 at a percentage or mileage based rate.

Where did you get pack specs from? Didn't think anything had been announced....

 

[Dark-Fx]

Where did you get pack specs from? Didn't think anything had been announced....

RJ.

 

[VandalSibs]

RJ.

Nice! Missed this post (as I'm not on the site formerly know as Twitter).

 

[BigSkies]

My apologies, I didn't mean to imply that curbside charging was a bad idea - they are just much more of a Europe thing. Which considering R2 will eventually make it there would be nice, but they are currently designing for the market they are selling in...

Port location is also based on proximity to one of the motors (so that AC charging can use the inverter to charge the DC pack), and the single motor version of R2 is going to be rear-wheel drive. Saves on copper not having to run extra HV wiring from a front port to a rear motor.

I hear that the new NACS standards are designed with future curbside charging in mind, with more options for "bring your own cable" style charge ports. This should work better with curbside chargers, where driving over the cable is a real thing.

I don't really know the details and the market clearly isn't there today. But it's at least being thought about.

 

[TexasBob]

RJ.

This is what worries me most about R2. I think it needs a 110 kwh pack to be competitive on range and this looks like a 100kwh pack to me. If R2 is not in the 330 mile club with AWD, the rotund lady is going to sing. IMO

 

[HaveBlue]

No desert camo? Not many trees about.

Next time you are in Moab, look up to the La Sal Mountains,

Hope they brought lots of extra tie rods on their Moab excursions.

 

[HaveBlue]

This is what worries me most about R2. I think it needs a 110 kwh pack to be competitive on range and this looks like a 100kwh pack to me. If R2 is not in the 330 mile club with AWD, the rotund lady is going to sing. IMO

By my napkin math: LG 2170 cell is 5ah (5000mah). The 2695 is supposed to have (at least) 6x the capacity so let's say 30ah * 768 cells * 4.2v = 96.7KWH.

Based upon small car based SUVs, efficiency varies from about 3.1mi/kwh BYD Sealion/EV3/Skoda up to the Model Y at 4.4mi/kwh. The R2 would be gifted to get 3.5 IMO so that could be an EPA 340miles or 300 miles at the low end of the group.

 

[Viking80]

Pack has 768 cells split across three modules. Only way to configure this less than 500V per module means 8s32p to hit the 256 cells per module. Max charging voltage at 4.2V per cell means it's 403.2V max. 403.2V * 500A is 201.6kW, but charge rates never really hit the max voltage here, so I'm guessing it's probably more like 180kW max charging. Which, with higher efficiency, probably fairly close to R1 at a percentage or mileage based rate.

You’ve got your s’s and p’s backwards but based on your assumptions it doesn’t matter. Why do you assume 500A is the maximum? NACS can do up to 325kW currently. If we are assuming the R2 will run 400V architecture, theoretically it’ll take 800A but that is heavily based on system design and the cell max charge rate.

 

[TexasBob]

By my napkin math: LG 2170 cell is 5ah (5000mah). The 2695 is supposed to have (at least) 6x the capacity so let's say 30ah * 768 cells * 4.2v = 96.7KWH.

Based upon small car based SUVs, efficiency varies from about 3.1mi/kwh BYD Sealion/EV3/Skoda up to the Model Y at 4.4mi/kwh. The R2 would be gifted to get 3.5 IMO so that could be an EPA 340miles or 300 miles at the low end of the group.

FWIW:
4.2 is max voltage. I think gross pack should be calculated at nominal ~3.65. I was running 35 Ah and 98kwh gross, 93 kwh usable. At 3.1 =294 (assuming this for tri) and 3.3 = 314 AWD and 333 RWD.

I fear this is coming in light on range and we already know its coming in light on charging speed because of the 400V.

Assumption	Voltage	Ah/cell	Gross kWh (768 cells)
Nominal (realistic)	3.65 V	35 Ah	98 kWh
Max (4.2 V)	4.2 V	35 Ah	113 kWh

 

[HaveBlue]

You’ve got your s’s and p’s backwards but based on your assumptions it doesn’t matter. Why do you assume 500A is the maximum? NACS can do up to 325kW currently. If we are assuming the R2 will run 400V architecture, theoretically it’ll take 800A but that is heavily based on system design and the cell max charge rate.

The R1 does 500A and RAN cables as well as EA also can. ie 500A * 400V = 200KW

 

[HaveBlue]

FWIW:
4.2 is max voltage. I think gross pack should be calculated at nominal ~3.65. I was running 35 Ah and 98kwh gross, 93 kwh usable. At 3.1 =294 (assuming this for tri) and 3.3 = 314 AWD and 333 RWD.

I fear this is coming in light on range and we already know its coming in light on charging speed because of the 400V.

Assumption	Voltage	Ah/cell	Gross kWh (768 cells)
Nominal (realistic)	3.65 V	35 Ah	98 kWh
Max (4.2 V)	4.2 V	35 Ah	113 kWh

A full Li cell is 4.2v. 3.7v is about as low as you want the cell to go. I don't think it's possible to extract 98kw from a battery at 3.65v

 

[kurtlikevonnegut]

MT article I read recently specifically stated 330. They have some pretty good sources at Rivian, so I'd expect the EPA range to come in right around 330.

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