Standard pack R1T DCFC curve

[Glstr]

Here’s the other side of this: if it’s really a large pack and batteries loses say 15% of their available life over a few years, if the standard is really a large, would that lose 15% of the 136kw or whatever it is? If so, that’s going to take a larger chunk out of the usable of the standard battery.

15% reduction in range on 350 mile range (based on large pack) would be around 50 miles lost. If that’s applied to 270 mile range on the SP usable, that would bring it down to around 220 max.

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[Glstr]

I don't think so, I think it's all top end buffer.

From Rivian the usable capacity of the large is 131 kWh and standard 106 kWh.

If you look at the charge curves for the large pack here:
https://www.rivianforums.com/forum/...48-recent-dc-fast-charging-l3-sessions.22635/

The large pack actually hits 100 kw charge rate around 68%

68% of 131 is 89 kWh
85% of 106 is 90 kWh

If there was bottom end buffer on the standard pack, you would expect it to hit 100 kw charge rate at a number less than 85% SOC

As far as my every day use for my standard pack, I am charging to 90% which nets me about 250 miles, if I need the full 270 miles I wouldn't hesitate to charge to 100%

So it seems that the 270 range on 100% SOC is accurate for you? Rivian has been accurate with their range estimates on the large battery. Curious what conditions you are driving in (flat vs hilly, weather temps, lead foot vs hyper miler).

 

[EvAdventure13]

So it seems that the 270 range on 100% SOC is accurate for you? Rivian has been accurate with their range estimates on the large battery. Curious what conditions you are driving in (flat vs hilly, weather temps, lead foot vs hyper miler).

Yes pretty spot on for mixed driving. Large pack DM gets about 2.4 mi/kwh at 70 mph with 21 inch wheels so at 106 kWh should net about 250 miles on the highway

 

[Supratachophobia]

Its pretty good considering the 70% starting soc

Makes you wonder if that battery isn't really at 70%....

Which would of course be the Holy Grail of battery marketing I've spoke about, "this battery won't degrade during the lifetime of your ownership".

 

[Tarponman85]

So has it been discovered if the standard pack is just a software locked version of one of the larger packs?

 

[edman007]

Here’s the other side of this: if it’s really a large pack and batteries loses say 15% of their available life over a few years, if the standard is really a large, would that lose 15% of the 136kw or whatever it is? If so, that’s going to take a larger chunk out of the usable of the standard battery.

Depends on how the SW limits it, but I would expect it just limits it based on voltage or whatever so if the pack loses 15% you lose 15% usable (so less real miles lost and an equivalent large pack).

And the truth is, battery wear is heavily related to voltage, if the cap functions as just never letting you charge past 80% it's going to wear slower anyways because you can't charge to 100%

So has it been discovered if the standard pack is just a software locked version of one of the larger packs?

Yes, I think so, the EPA docs specifically say it's SW limited

I suspect this is because the battery changes for a real standard pack are part of the battery improvements that they are implementing in the refresh. They did the SW limit to get it out the door faster and boost sales. Newer ones will likely have an actual smaller battery.

 

[EvAdventure13]

Depends on how the SW limits it, but I would expect it just limits it based on voltage or whatever so if the pack loses 15% you lose 15% usable (so less real miles lost and an equivalent large pack).

And the truth is, battery wear is heavily related to voltage, if the cap functions as just never letting you charge past 80% it's going to wear slower anyways because you can't charge to 100%



Yes, I think so, the EPA docs specifically say it's SW limited

I suspect this is because the battery changes for a real standard pack are part of the battery improvements that they are implementing in the refresh. They did the SW limit to get it out the door faster and boost sales. Newer ones will likely have an actual smaller battery.

Can you link to the epa document indicating it's a software limited battery?

 

[edman007]

Can you link to the epa document indicating it's a software limited battery?

Read in the blue box on page 10

The doc (PDF)

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