Mitigating Limitations of Regenerative Braking?

[Sgt Beavis]

Just curious, what road are you coming down? It looks like Lee Hill Dr or Sunshine Canyon. I haven't come down Sunshine yet but I've driven Lee Hill both ways and have never touched my brake pedal.

Let me know and I'll try driving it this weekend and let you know what happens with my R1T. Feel free to PM me if you want to keep it private.

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[Phrogz]

I’ve seen this routinely on local steep descents. My guess is that it’s a heat issue. I’m highly confident it has nothing to do with the battery’s charge level as I’ve had it at 30 to 70%.

The incongruous thing is that on a 21°F morning it behaved roughly the same, except that a snowflake icon appeared next to the regenerative braking curve and instead of “Regenerative braking reduced. Use brake to slow down” the message said “Acceleration and regenerative braking are reduced until the battery warms up”.

 

[Phrogz]

Just curious, what road are you coming down? It looks like Lee Hill Dr or Sunshine Canyon. I haven't come down Sunshine yet but I've driven Lee Hill both ways and have never touched my brake pedal

This is the last mile of Magnolia.

 

[Phrogz]

I video’d it yesterday for those curious. I’d climbed in the truck a minute prior at 43°F, drove a few hundred feet, stopped to take out the garbage, and then started videoing. The reduced braking starts around 0:54; I repeatedly had to use the brake pedal for safety.

 

[Zorg]

I assumed that regen goes through the main inverter (motors are AC, pack is DC). At least, that's how it worked on my RC cars.

On my Tesla (R1T should arrive soon), regen peaks at 50KW, so that's definitely not going through on board charger.

 

[SeaGeo]

The incongruous thing is that on a 21°F morning it behaved roughly the same, except that a snowflake icon appeared next to the regenerative braking curve and instead of “Regenerative braking reduced. Use brake to slow down” the message said “Acceleration and regenerative braking are reduced until the battery warms up”.

The inconsistency is the thing the confused me too. I was able to "prompt" the snowflake last night, which was a first.

 

[Sgt Beavis]

This is the last mile of Magnolia.

Oh, I know that road. Yea, I've driven up a few times but haven't come down it with the R1T. Last time I did it was in my Raptor and I could smell my brakes afterwards.

 

[McRat]

For those in SoCal, you can see this happen regularly on the way down from Big Bear.
My I-Pace didn't do it, nor does my Model X.
It doesn't matter if you are 2wd (Conserve) or 4wd Sport, All-Purpose, Snow.
I charge to 85% for the trips (round trip consumption 50-55% SOC).

I'm thinking if we can get a datalogger and read the battery temp and inverter temp and coolant temp, we might be able to fit a bigger radiator or fan to increase airflow and cool the system faster.

It should not be happening.

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