Gen2 Tri poor DCFC speeds

[BCondrey]

How do you know the Truck was the limit here and not the charger? I've had a really wide variety of DCFC experiences. RAN is not always 200kwh below 70%....

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[hammick]

How do you know the Truck was the limit here and not the charger? I've had a really wide variety of DCFC experiences. RAN is not always 200kwh below 70%....

In the service menu you can see how many amps the charger is providing. It showed 500 amps when it initially ramped over 200kw and was still showing 500 amps when it dropped to 137kw. Additionally the dash screen in front of the steering wheel will show "charge limited by charger" if the charger is not providing the power the truck is requesting.

 

[Donald Stanfield]

I fast-charged today at an EvGo, and that charger screamed electrons into my tri. I was pulling 204 from 20-35% and didnt drop below 150 until almost 70%.

 

[hammick]

I fast-charged today at an EvGo, and that charger screamed electrons into my tri. I was pulling 204 from 20-35% and didnt drop below 150 until almost 70%.

You held 150kw or above until close to 70%? That's incredible. What was the outside temp and what was your SOC when you started the charge?

 

[Donald Stanfield]

You held 150kw or above until close to 70%? That's incredible. What was the outside temp and what was your SOC when you started the charge?

It was 70 degrees, and I started with 20%. It was probably the best charge I've gotten in either Rivian I've had. I had a Gen 1 for a couple of years before I got my trimax.

 

[SPITmadFIRE]

Plugged in around 32% and it ramped to 204kw which is great and shortly thereafter dropped to 138kw and held there until I unplugged at 45% (was at 139kw). Tried a different charger and it would only ramp up to 138kw at 45%. Not happy.

The Gen2 Dual Max I demoed for several days charged much better.

I promise you it didn't. These vehicles, especially the Max Packs, do not charge well at all. You'll get nowhere near the max charge rate when the SOC is above 30% starting a charge. It doesn't matter how fast or empty the charger is.

If any of the following are true, you won't hit your max charge rate at all, and the overall charge will take ages:

• starting SOC above 30%
• starting battery temp outside of optimal range (78F to 85F)
• AC or heat on inside the vehicle
• a million other reasons

 

[PaythePiper]

Ah Rivian thermals. They suck. Get used to it. You’ll get all the excuses, but it’s fact. If you have no other EV to compare it to, you might think they are fine. Nope. Charging still works though so that’s good!!

 

[Donald Stanfield]

Ah Rivian thermals. They suck. Get used to it. You’ll get all the excuses, but it’s fact. If you have no other EV to compare it to, you might think they are fine. Nope. Charging still works though so that’s good!!

It charges as well as my wife's BMW. Too many of you act like Rivian is some massive outlier in performance when that simply isn't the case.

 

[PaythePiper]

It charges as well as my wife's BMW. Too many of you act like Rivian is some massive outlier in performance when that simply isn't the case.

Really wish we didn’t have to use adapters with Tesla. That definitely doesn’t help

 

[Donald Stanfield]

Really wish we didn’t have to use adapters with Tesla. That definitely doesn’t help

Never seemed to cause me any issues.

 

[emoore]

Really wish we didn’t have to use adapters with Tesla. That definitely doesn’t help

I get over 200kw with the Tesla adapter so I don’t understand how that hurts charging speed.

 

[SeaGeo]

I have found that the Rivian max packs gets too hot when preconditioning in the winter, especially in winter when its mild. I have a "23 R1S Dual Perf Max and a Tri and they both do this. My trick when preconditioning, once battery temp gets to 75-80 disable charger destination in nav and if u still need it for directions select another address right next door so it doesn't continue preconditiong. If left unchecked the motors will transfer heat for it to get up to 95-100 degrees or more when mild in winter. Rivians don't have the best thermals, they only have 1 cooling plate so when the pack comes in toasty hot and when charging > 200 kw it will thermal throttle relatively quickly because the cooling can't keep up which is why you see that yo yo affect. When coming in 15-20 degrees cooler It sustains higher charging speeds deeper into the SOC; it still gets hot and thermal throttles but not as fast. I'm hopeful software will fix this; I've shared my experience with my Atlanta experience space and SC and they said this is being looked into on a future update.

That's not a winter behavior, it's just what they are preconditioning to on purpose. My R1S just did 6 to about 45% at ~200kw on Friday with it preconditioned to 95F. It did derate a bit, but it also hit their rated 41 minutes for 10-80%.

Conversely on Sunday I showed up at the same RAN with a pack in the 70s and starting at 27% and never exceeded 185kw, nor did it sustain speeds as well. On the following charge it preconditioned to the mid 90s again and held ~200kw from 19% to 51% before it started tapering due to voltage.

Thanks. No RANs anywhere near us but we will be using 4 of them on our trip.

I'm still skeptical that something is up with the Tri vs the MAX. Here are my notes from the G2 Dual Max Performance we demoed for several days.


5% to 80% preconditioned Supercharger results (20 degrees out)


5 to 45 in 20 min

5 to 63 in 30 min

5 to 70 in 35.30 min

5 to 75 in 39:50 min

5 to 80 in 45:30


203 at 25%
190 at 26%
191 at 29%
192 at 30%
206 at 31%
207 at 33%
208 at 34%
192 at 35%
189 at 39%
197 at 40%
196 at 42%
178 at 45%
181 at 47%
163 at 49%
164 at 50%
165 at 53%
156 at 54%
157 at 56%
142 at 58%
142 at 59%
142 at 60%
136 at 62%
136 at 65% then fell to 110
108 at 67%
108 at 69%
100 at 70%
100 at 71%
85 at 73%
84 at 75%
84 at 76% then fell to 67
67 at 77 %
67 at 78%
67 at 79%
67 at 80%

This is roughly what I see with my Dual. I've also compared Jose's Tri-max charging data and the OOS tri-max charging data and they provide the same overall charging curve. The pack is the same, they packs are just sensitive to temps. At least using RIvian's logic with them.

This was at a RAN charger with a "warm" battery (only around 70f):

This was at the same RAN charger with a battery that was preconditioned to 95F:

 

[PaythePiper]

I get over 200kw with the Tesla adapter so I don’t understand how that hurts charging speed.

Here in the Arizona summer the adapter kills my charging. But that’s not any fault of the car. Still seems Rivians throttle a lot more. My Y never throttles in the garage on L2. The Rivian does all the time (summer)

 

[azbill]

I get over 200kw with the Tesla adapter so I don’t understand how that hurts charging speed.

I have seen the charge rate drop after 1-2 minutes using the adapters. They send the pin temps to the Tesla chargers and the charger throttles the rates. Yes, starts at 210kw then right way drops to 120kw. Happens with my Hummer also, and both trucks show limited by charger.

FYI, GM published the specs for the Tesla adapter, rated at 500A for 10 minutes (@80F), then only 300A continuous. In the summers I charge at 90-110F and it never provides 500A for 10 minutes.

 

[emoore]

I have seen the charge rate drop after 1-2 minutes using the adapters. They send the pin temps to the Tesla chargers and the charger throttles the rates. Yes, starts at 210kw then right way drops to 120kw. Happens with my Hummer also, and both trucks show limited by charger.

FYI, GM published the specs for the Tesla adapter, rated at 500A for 10 minutes (@80F), then only 300A continuous. In the summers I charge at 90-110F and it never provides 500A for 10 minutes.

My last big trip in August where temps were in the 90s, I didn't see much derating using the A2Z adapter on Superchargers. Maybe the A2Z adapter is better at holding 500A than the Tesla adapter?

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