Gen2 Max 0-100% DCFC

[ElGuano]

I've dished out more than my fair share of (good natured) ribbing at OOS, but I really enjoyed this piece they just released:



A relatively brief analysis of two side by side 0-100% charging sessions, one on Tesla Supercharger and one on EA, for a new Gen2 TriMax. Good, repeatable results that provide some interesting and actionable data.

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[iamnid]

Saw this too. It takes about the same time to go from 0-80% as it does to go from 80-100%.

 

[SadHill]

he should have done it on a RAN charger too to see the difference Rivian throttles at.

 

[VSG]

Amazing, a short video from OOS!

TL;DR: Both that specific Tesla charger and that specific EA charger charged at about the same rate, with slight variation at different points in the charging curve.

IMO this is an obvious conclusion. In the CCS protocol, the vehicle is requesting a specific voltage and a specific current from the charger. If the charger can't supply that, it will negotiate a lower number with the vehicle. So the only way a charger can deviate from the requested Rivian charging curve is if the charger itself throttles back. With different charger hardware, the internals may heat up different rates, or may have different discrete voltage levels it can deliver (vs. a continuous variable voltage) or other hardware-specific limitations. Individual pedestals can also have variations which allow one to charge slightly faster than an other.

So if the chargers are delivering what the Rivian is asking for, then there should be no difference in charging speed.

 

[ElGuano]

IMO this is an obvious conclusion. In the CCS protocol, the vehicle is requesting a specific voltage and a specific current from the charger. If the charger can't supply that, it will negotiate a lower number with the vehicle. So the only way a charger can deviate from the requested Rivian charging curve is if the charger itself throttles back. With different charger hardware, the internals may heat up different rates, or may have different discrete voltage levels it can deliver (vs. a continuous variable voltage) or other hardware-specific limitations. Individual pedestals can also have variations which allow one to charge slightly faster than an other.

So if the chargers are delivering what the Rivian is asking for, then there should be no difference in charging speed.

It's also instructive to see that in two separate charging sessions, the car seems to be requesting the same voltage/charge curve; it's not always the case that it does (due to temp, preconditioning, any other kind of x factor). And there are some reports here and on the internet that some people never see 200kw on any charger. So this video also lends some evidence to show that Rivians can be consistent in the rate they request.

 

[C12farmer]

he should have done it on a RAN charger too to see the difference Rivian throttles at.

The problem with RAN chargers is each 300 kW power cabinet power shares between two or three dispensers. On a busy weekends when RAN actually fill up, this can make a tangible difference in charging time. It's all luck who will end up next to each other. This is the one situation where I would consider using the gimmicky charge status light bar on my Gen2.

One of the impressive things about Supercharger stations is they can power share 250kW between pretty much all the dispensers within a site. Pretty much not possible to hit the power share limit when it's split between 12, 16, 20+... stalls.

 

[hammick]

Anyone have a theory why the Tri Max charges slower than the Dual Max? Car and Driver said the Tri Max charged slower and I called BS until I experienced it myself. We had two separate overnight test drives and I tested both the Dual Performance and the Tri. Charged at the same supercharger location and confirmed in the service menu chargers were giving 500 amps. Dual Max charge was at 20 degrees Fahrenheit and Tri Max was at 24 degrees. Both were fully preconditioned before my testing. Results below.

Dual Max (20 degrees Fahrenheit):

5% to 45% in 20 minutes

5% to 63% in 30 minutes

5% to 70% in 35.30 minutes

5% to 75% in 39:50 minutes

5% to 80% in 45:30 minutes


Tri Max 24 degrees Fahrenheit)

5% to 45% in 21:37 minutes +1:37

5% to 63% in 34:19 minutes +4:19

5% to 70% in 39:11 minutes +3:41

5% to 75% in 43.08 minutes +3:18

5% to 80% in 48:54 minutes +3:24


Three and a half minutes longer isn't the end of the world but it adds up on a 1,200 mile road trip which is the distance we often travel. I would love to see Rivian get the 5% to 70% down to 20 minutes.

 

[hammick]

Here are my findings on the Dual Max. I didnt' keep a detailed log on the Tri but it dropped low at 37% and then fell off a cliff at 55% then slowly regained some.

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%

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