Unexpected regen dots

[CharleyBC]

This surprised me the other day. We went for a hike, and left the car parked at the trailhead, elevation 5249 ft. I failed to note the temp on arrival, but it was cool, let's say 60s F. The car was in full sun, toasting nicely while we hiked for almost 3 hours. Upon our return to the car, the outside temp was up to 84 F. The battery was at 66%. Driving down the mountain, we had regen dots for about 3.5 letters (PRND). What the heck? Plenty warm, battery not too full. Why limited regen? Any theories?

 

[CharleyBC]

Wow. I stumped the masses.

 

[RayK]

Wow, okay I'll bite.

How about you had regen set to Low?

edit: How's the fires up there? My wife just postponed her trip up to Tualatin for a couple of weeks.

 

[mswlogo]

Maybe because it was such a long regen run it had to throttle it.

 

[Ravire]

I’ve been noticing regen dots a lot more than usual in SoCal where it’s been over 100 on and off for the last two weeks. I’ll get in my car and see the dots when at 80% even.

 

[nvx1977]

I have seen this on my LR RWD when doing a lot of downhill driving. My guess is that the battery is not really preconditioned to take sustained high charging yet, so the car is nerfing the regen to keep the battery within healthy specs.

I've also seen this right after I transition to winter tires. The car needs to get used to the difference in slippage of the tires.

Also, anyone with SR/SR+, you'll see regen dots way more than other trims due to your battery size. Smaller battery means more charge per cell during regen, so your regen nerf kicks in a lot earlier.

 

[Candleflame]

This surprised me the other day. We went for a hike, and left the car parked at the trailhead, elevation 5249 ft. I failed to note the temp on arrival, but it was cool, let's say 60s F. The car was in full sun, toasting nicely while we hiked for almost 3 hours. Upon our return to the car, the outside temp was up to 84 F. The battery was at 66%. Driving down the mountain, we had regen dots for about 3.5 letters (PRND). What the heck? Plenty warm, battery not too full. Why limited regen? Any theories?

its part of the regen nerf patch from march. likely something to do with battery warmth and stress i presume. i guess the 60kw of regen down a hill shouldnt matter that much when the battery is at 60% but who knows....

 

[WarpedOne]

It's the 60s F ... battery was to cold to push full charging current through it.

 

[GtiMart]

Yep, temperature's the issue. You started at 60F. Even if the top of the car is toasting, the underside isn't getting any sun. The battery is dense and needs a lot of energy to warm up.

 

[KenC]

If it's in the 60s all night, even if it's in the mid-80s by the time I get in the car, like yesterday was here, I always get regen dots. Always.

 

[sightman]

Are you on software 36.3? I noticed since then even when it’s 75-80 my car starts driving with 4 Regen dots. Seems to go solid within 30-60 seconds of driving though.

 

[Daniel in SD]

Dendrites!
I swear they’ve dialed back the regen with software updates. I drive up and down a big hill (600 ft) when I leave my house and get lots of dots coming down the hill even in fairly mild weather (60F). I just hope we don’t get #chargegate like the older Model S.