anyone experience long term reduction in regen

[hayduke]

I am not sure if there is anything particularly wrong with my truck (14 months old, 16k miles) but over the last month or two I've noticed that I am not able to regen nearly as much as I used to. Unlike complicated range tests that are difficult to repeat, I live in a very hilly area and routinely travel up and down 1000s of feet on shorter, routine drives. I've always been impressed on how I can drop down a steep mountain pass and never touch the brake while ICE cars need to downshift and pump the brakes.

Given that the weather here this time of year is fairly constant and mild, and I typically charge to the same amount (70%) I thought the fact that I now need to use the brakes significantly toward the bottom of long hill descents (but didn't used to) was somewhat telling. The audible "ding" of regen being reduced now happens earlier, more severely (in terms of the bar shown on the dash) and often than it used to.

Based on what I know about batteries, I might have assumed that if I happened to be at a low state of charge, regen ability might be more available (we all experience how it is reduced at high state of charge). At least anecdotally, I haven't noticed this. The other day I left home with ~60% state of charge and within just a mile or two on a downhill but not a steep one regen got limited fairly noticeably.

Intuitively it just seems very strange, since even under heavy regen the battery is getting charged at a rate slower than a DCFC, so I'm wondering why I get limited so much.

Of course this could be the result of a software update but if there is some issue it seems like it would be difficult to go to a service center and say either way something is wrong or not, and if so, by how much and if that is covered by the warranty. I guess there is no regen degradation clause in the warranty.

Anyone else experience this? Realizing I might be a corner case with so much vertical driving in my daily routine. i tried posting this in the general degradation thread here but seemed like it was long enough it just sparked some new replies to much older replies. wondering if i’m the only one. added a pic with the bottom part of the regen bar being flat rather than rounded.

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[jollyroger]

In my experience, regen is dependent on batteries not being full, and the battery being at a good temperature. If it cold out where you are then maybe that could explain it? I didn't see a temp reading on your picture.

If the regen is not working like it used to and the temps are not cold, then I would open a ticket explaining that you used to not have to hit the brakes, but now you do.

Also one last thing to check is that if you are intending to be on high regen and for some reason it got reset to standard regen, then it might also explain the change in behavior.

Lots of guesses on my part so hopefully something stands out.

 

[hayduke]

i have had my truck set in high regen since day 1.

you’d have to define cold but it’s sunny and hot during the day. no snowflake icon shows up on the battery.

thanks for the guesses. i’ll create a service ticket but absent them coming out here and driving up and down mountain passes with me not sure how we’d reproduce it.

as our batteries age i sure hope rivian is thinking about releasing transparent info about the state of health of our batteries.

 

[willferrel]

Actually an issue for me as well. This is my second R1T and the second one has noticeably weaker regen that my original truck. It’s actually at the service center for this issue. Will update if anything comes of it.

 

[Electrified Outdoors]

If possible charge to 50-60% and set regen to normal vs high. In some scenarios normal may provide more Regen than high in very hilly areas by allowing a lower amount of Regen for a longer period of time.

Above 60% software will not allow to hold Regen as long. Not sure how much range you use daily but if it's 30% or less I would charge to 50-55% with normal regen to see how much more energy you can capture.

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