Question for Large+ pack owners - how's your experience been?

[jrothman]

Calling all Large+ pack owners (which I believe is for the 2025 Dual motor vehicles only) - how has your experience been? I'm seriously considering a Large+ pack - I found one in inventory - and was wondering if the rumors are true.

• Can you charge to 100% (ie. 78% of the Max pack) without battery degradation?
• All gen 2 duals come with a silicon carbide motor in the front, but the max pack has one in the front and rear. Does the Large+ have them in the front and rear, too?
• Anything else that you've noticed that could help me decide? Good or bad?

Thanks so much for any and all help!

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[Megaman0025]

Why are you calling it Large + (plus). Is that a new config? Or an old one? I don’t Mean to be annoying but trying to clarify for the sake of understanding which pack you mean.
I don’t think anyone knows yet if this is a software locked max pack as of yet.

 

[jrothman]

Thanks for bringing this up, Megaman0025! It makes sense that the Large+ isn't a well-known thing. Here's piece about them from RivnTracker.

In brief, early into the release of the Gen 2 vehicles Rivian wasn't able to produce the Large battery pack, so they decided to take Max pack (140 kWh) vehicles and software lock them to the Large pack range (330 miles). Once the true Large pack (109 kWh) went into production, the Large+ went away, but there's still some Large+'s out there that make their way into inventory from time to time.

I'm hoping that some Large+ owners out there see this post and are willing to share their experience. Seems like one of the few places where I might find folks with this unicorn of a vehicle.

 

[Megaman0025]

Cool, I figured that’s what you meant, but How are you so sure it is a software locked Max pack? Of course I’ve seen the rumors but no one has ever confirmed this to my knowledge.

 

[Megaman0025]

Nevermind i just read the Rivian tracker post. I would love to see some kind of tear down confirming this! Thanks for the update.

 

[R1Yes]

We've had a Large+ for about six months. We charge to 100% frequently, but I don't think there's any way to know (yet) if it's adversely affecting the battery.

I'm choosing to trust Rivian's statements that it's "safe" to charge to 100% with the Large+

 

[jrothman]

We've had a Large+ for about six months. We charge to 100% frequently, but I don't think there's any way to know (yet) if it's adversely affecting the battery.

I'm choosing to trust Rivian's statements that it's "safe" to charge to 100% with the Large+

Thank you, R1Yes! That's super helpful to know.

What kind of efficiency are you getting out of it?

I ask because the Max pack has two Silicon Carbide motors on it - unlike the Standard and Large which have a Silicon Carbide in the front and a less efficient motor in the rear. So the Max has a better efficiency rating than the Large and Standard. I've heard that the Large+ is the Max in pack size and motors, so if your efficiency is on the higher side, that would add some strength to that claim.

 

[R1Yes]

I haven’t really paid much attention to efficiency, sorry! Is there a way to tell which motor is in the back?

 

[f1racer328]

If you have a Gen 2 Rivian you have the in house motors.

 

[jrothman]

If you have a Gen 2 Rivian you have the in house motors.

True. They're both enduro motors. But there's two types:

From here
"There’s a silicon carbide power module for the front unit inverter but a less-expensive silicon power module for the rear inverter. Silicon carbide has an efficiency of more than 99% compared to about 98% efficiency with silicon, according to Silva Hiti, Rivian senior director of electric power conversion. At peak efficiency, Hiti said this translates to 3.5% more range than if Rivian used silicon power modules for both inverters. It makes more sense to use more efficient (but more expensive) silicon carbide on the front unit that is used more in Dual-Motor models."

And the dual motor max has motors with the Silicon Carbide motors in the front and rear, which is why they have a higher efficiency rating (92 mpge combined in the max vs 83 mpg combined for the large and standard).

R1Yes. I don't know of a way to confirm which motor type you have! Sorry....

 

[R1Yes]

If I were betting, I’d bet the Large+ has the same config as the Max, since it’s supposedly a Max configuration they just software locked.

 

[mpshizzle]

I wouldn't get too hung up on the inverter... While there is indeed a measurable efficiency gain, in the real world it won't make too much of a difference. During Highway cruising, when efficiency matters most, the rear motor will be disengaged anyway.

 

[TomServo2112]

Calling all Large+ pack owners (which I believe is for the 2025 Dual motor vehicles only) - how has your experience been? I'm seriously considering a Large+ pack - I found one in inventory - and was wondering if the rumors are true.

• Can you charge to 100% (ie. 78% of the Max pack) without battery degradation?
• All gen 2 duals come with a silicon carbide motor in the front, but the max pack has one in the front and rear. Does the Large+ have them in the front and rear, too?
• Anything else that you've noticed that could help me decide? Good or bad?

Thanks so much for any and all help!

1. As far as I know, we can charge to 100%. Over 21k miles I have charged to 100 semi-regularly. (RivianTrackr and other sources discussed)
2. I have no knowledge of this motor difference. (Just read the rest of the thread so would like to believe we have the same config as the Max as well, but don’t know.)
3. Rumor has it that at some point Rivian will offer us the option to purchase the software unlock that gives us the Max Pack capacity. I’ll purchase if they do this.
The bad: There really is no day-to-day difference in having the Large+ versus a true Large, as far as i can tell, except for charging to 100%, which people with a true Large could do anyway if they really wanted (just with degradation risk). They don’t give us a better charging curve, which to me is a no-brainer. If we had the charging curve that the Max Pack has, it would free up every DCFC sooner if there’s a line, so why not do it? To me there’s no downside to just giving us that as part of having the Large+.

I am glad I have it, just for the possibility of unlocking the Max Pack at some point. Otherwise I don’t really feel like I have a tangible benefit.

My lifetime efficiency so far is 2.6mi/kWh. Since I got mine in September and temperatures plummeted quickly afterwards, I expect at the 1-year mark it’ll be higher than that. Electrafi.com reports that my Large+ capacity is 120.5kWh.

 

[jrothman]

1. As far as I know, we can charge to 100%. Over 21k miles I have charged to 100 semi-regularly.
2. I have no knowledge of this motor difference.
3. Rumor has it that at some point Rivian will offer us the option to purchase the software unlock that gives us the Max Pack capacity. I’ll purchase if they do this.
The bad: There really is no day-to-day difference in having the Large+ versus a true Large, as far as i can tell, except for charging to 100%, which people with a true Large could do anyway if they really wanted (just with degradation risk). They don’t give us a better charging curve, which to me is a no-brainer. If we had the charging curve that the Max Pack has, it would free up every DCFC sooner if there’s a line, so why not do it? To me there’s no downside to just giving us that as part of having the Large+.

I am glad I have it, just for the possibility of unlocking the Max Pack at some point. Otherwise I don’t really feel like I have a tangible benefit.

My lifetime efficiency so far is 2.6mi/kWh. Since I got mine in September and temperatures plummeted quickly afterwards, I expect at the 1-year mark it’ll be higher than that. Electrafi.com reports that my Large+ capacity is 120.5kWh.

Thank you, Tom! This is incredibly useful. I'm leaning pretty hard on getting it. Just seems like these are rare, charging to 100% without degradation is a great benefit, and the possibility of unlocking is significant.

Agree on the charging curve! It's bizarre that the pack wouldn't follow the same curve as a typical Max.

 

[R1Yes]

Yeah, being able to charge to 100% regularly is a huge benefit—I feel like I’m getting most of the benefit of having the Max (assuming I’d charge a Max to only ~80% normally) for a lot less money

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