It’s installing right now. I’ll report back after trying it out.
This is nothing to do with tesla chargers, Rivian are quietly via unofficial channels admitting there’s an issue (it’s impacting employees as well) - but they also may never be able to fully resolve these issues via software alone on the gen2 max packs. hopefully that’s proved wrong and they find a way; my suspicion right now is that they can’t both power the battery heating system sufficiently and l2 charge simultaneously. This speculation comes from @MarkNorman ’s observations on dc charging preconditioning to mitigate the issue, I’m struggling to think of another reason they wouldn’t just run the heater whist charging: like they do on the gen1 models… if so I wonder if they will end up doing somthing like cycling between periods of l2 charging and battery heating in low weather; would be weird, but would cut the overall charge time.
I’ll bet it is pulling some power for heating the pack, there is a 0.5 to 1.5 Kw delta between the consumption reported by the app and the charge rate reported by ABRP.
When did the L2 charging speed start to throttle? 80%? Higher? How much throttling did you see this time? Any throttling is unacceptable, IMO. But if starts later, and isn't as severe, it might be livable. Maybe.
I didn’t take a screen shot this time, but it definitely started throttling at <80%. I’ll do a better job tracking next time and charge above 90% to see where the stair steps are now.
this is why I’m starting to think it could be about being able to put sufficient heat where it’s required. in gen1 there was simple resistive heater in the pack afaik, whist in gen2 I think they have a heating element inline with the heat pump? All speculation of course, as these trucks are wonderfully opaque
It's the same cell as the Gen1 max pack.Gave 2024.51.31 another try this afternoon and didn’t see much, if any difference. In the screenshot you can see the classic Gen 2 cold-pack, high-SoC, stair-step L2 throttle. The amperage offset from 2024.51.30 does make a slight difference by bringing up the throttled rate by about 1 Kw.
My hope that 51.31 would bring up the pack temp does not seem to be born out since it didn’t get above 46F.
I sure hope Rivian got a screaming deal from the Gen 2 NMC cell provider because they suck!!! Boohoo for me, I know. I’ll live.
Interesting, so do you think it’s just the switch to the heat pump that’s causing the L2 throttling issue at lower temps and high SoC or is there another variable in this equation?
Replugged the car in, now charging at 1.2kw instead of 0.7kw. Battery is still same temp (43 to 44°F) at 97% soc.Tried charging from <60% to 100% soc last night after hot fix 51.31 was installed a couple days ago (large pack). Looks like I'm at 0.7kw instead of 0.5kw when over 90% soc. A little improvement but nothing like we should have. Battery was 44°F this morning when I unplugged after the screenshot so the charging didn't add heat to the battery (garage was at 44°F as well).
I don't whyot would be the heat pump
