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Battery voltage confirmed: 400V-450V

kylealden

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Apologies if this had been definitively confirmed elsewhere - I seem to recall some debate about 400 vs 800v batteries.
I saw this snap from the Rebelle R1T (via the auxiliary display manufacturer). Seems to confirm 400-450V.

Rivian R1T R1S Battery voltage confirmed: 400V-450V 1437D4A7-973D-4F81-8B53-49FFBCA46F39
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SeaGeo

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Would never have bet that this post wouldn't get several replies within hours of being posted.
 

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I think really its the fact that this is a screen cap from a Vehicle in the rebelle rally that could have changed a lot by the time production comes. We at least have a baseline which is awesome but hopefully it's not the final number.
 
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kylealden

kylealden

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I do appreciate that things can change, but if they’re changing configuration this close to production, that would be pretty surprising.

I think it’s reasonable to assume they locked suppliers and major component decisions like this last year or earlier, and the Rebelle car seems pretty close to production intent in most respects - enough so that they permitted extensive write ups and reviews of the experience.
 

CommodoreAmiga

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I thought we already knew it was a 400V battery?

The question: is can it charge at 400/800V or only 400V? We don’t know, yet.
 

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Rhidan

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I do appreciate that things can change, but if they’re changing configuration this close to production, that would be pretty surprising.

I think it’s reasonable to assume they locked suppliers and major component decisions like this last year or earlier, and the Rebelle car seems pretty close to production intent in most respects - enough so that they permitted extensive write ups and reviews of the experience.
Emme Hall’s write-up literally said they had a R1T with an “extremely pre-production” version of the battery that was not final production-intent.

Maybe this is another “clue” on the final voltage, but I would not use the word “confirmed”
 

azbill

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All the numbers Rivian has published in writing so far, 140miles in 20minutes, are a sure indicator of 400V/200KW charging. But I have some ocean front property for sale in Arizona for those who do not want to believe that.
 

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All the numbers Rivian has published in writing so far, 140miles in 20minutes, are a sure indicator of 400V/200KW charging. But I have some ocean front property for sale in Arizona for those who do not want to believe that.
Yeah, pretty sure that LE buyers will get only 400V, but 200kW is still damn fast.

I do wonder when they *might implement the 400 to 800 switch for charging, and whether the max packs might have it. If equipped on the max packs, that might make me consider moving off my LE.

Thermal management will be key, and I'm curious how long speeds around/above 200kW would be sustainable even with 800V charging...
 

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The second data point that confirms 400V is the story on the cold weather testing. They stated in the video testing at 400A and going next to testing at 500A. 500A is not possible with 800V charging.
 

Rhidan

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All the numbers Rivian has published in writing so far, 140miles in 20minutes, are a sure indicator of 400V/200KW charging.
We all keep quoting the 140 miles in 20 minutes figure that is a reference to the RAN, but the website also just says 200kW charging:

Battery pack

Our battery packs are engineered and tested for extreme hot and cold temperatures. Optimized thermal control allows towing of up to 7,700 lbs on steep grades, high-power DC fast charging at over 200kW for sustained periods to ensure the shortest possible charging times and controlled cell temperatures to enhance battery performance and extend driving range. Our packs are also designed for long life with a smart battery management system built on Rivian’s proprietary control algorithms. The system is designed to adapt and optimize performance based on charging habits, driving behaviors and climate conditions.
 

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timesinks

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It also says "over" and "sustained" implying room for a higher peak.

It may well be the case that the pack is only 400V and maxing out at 200kW, but the language used, rally photo, and omitted info doesn't actually rule out the 400V/800V switching technology. If they can switch, why couldn't they charge in either 400V or 800V mode if one is deemed more advantageous than the other for winter conditions?

It seems slim, I just think we should acknowledge the difference between what has been authoritatively published by Rivian and what is just a (albeit likely) logical extrapolation from that information.
 

DucRider

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We all keep quoting the 140 miles in 20 minutes figure that is a reference to the RAN, but the website also just says 200kW charging:
Both of those figures line up with the likely pack structure of 108 cells in series with a nominal voltage of ~400 and a max charging voltage of ~450.

It may well be the case that the pack is only 400V and maxing out at 200kW, but the language used, rally photo, and omitted info doesn't actually rule out the 400V/800V switching technology. If they can switch, why couldn't they charge in either 400V or 800V mode if one is deemed more advantageous than the other for winter conditions?
There is no point in implementing 500A charging if the vehicle is capable of accepting 800V.
200kW @ 800V is 250A versus the 500A needed for 400V. All equipment currently installed (EA, etc) and/or on the market (including the proposed RAN in Saldia) that can do 200 kW at 400V can also do it at 800V. The beefier everything needed to handle double the amperage means they did not implement 800V charging.

400V vs 800V charging is not a factor in cold weather.
 

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We all keep quoting the 140 miles in 20 minutes figure that is a reference to the RAN, but the website also just says 200kW charging:
The math is simple and has direct correlation. We know the vehicle is about 425-450W per mile, or 2.2-2.35 mile per KW.

Charging at 200KW for 20 minutes = 67KWH. 67KWH * 2.2mile/KWH = 147 miles, assuming no charging loses. There will be charging losses, so 140 miles in 20 minutes is equal to 200KW charging rate. Below 50% SoC (400V nominal) the rate will be slightly less than 200KW, and above 50% SoC it will be slightly more.

So yes, the web site makes two independent statements, but those statements are completely consistent with each other.
 

kanundrum

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The math is simple and has direct correlation. We know the vehicle is about 425-450W per mile, or 2.2-2.35 mile per KW.

Charging at 200KW for 20 minutes = 67KWH. 67KWH * 2.2mile/KWH = 147 miles, assuming no charging loses. There will be charging losses, so 140 miles in 20 minutes is equal to 200KW charging rate. Below 50% SoC (400V nominal) the rate will be slightly less than 200KW, and above 50% SoC it will be slightly more.

So yes, the web site makes two independent statements, but those statements are completely consistent with each other.

I guess in reality that isn't too bad I just wonder what the charging curve will be, if it can sustain 200KW for at least 80% SOC or will it take 1.5 hours+ to to get to at least 80% SOC for long travel.
 

MReda

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I guess in reality that isn't too bad I just wonder what the charging curve will be, if it can sustain 200KW for at least 80% SOC or will it take 1.5 hours+ to to get to at least 80% SOC for long travel.
I'm going to guess that it sustains 200kW (over, at, or near) for 20 minutes, and that's why we have a "140 miles in 20 minutes" quote. If it was sustaining those speeds for significantly longer, we'd be looking at "200 miles in 30 minutes" or something like that.
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