Do the brake lights come on when regen active?

[Dee]

I am sure when the question came up on here before that the answer was the brake lights will come on whether using the brake pedal or lifting off accelerator braking - only above a certain level of G force decelaration.

Which is set akin to using brakes in an ICE vehicle.

If you are on auto, depending on traffic in front of you, the brake lights will come on but that's actual braking to slow down (whether or not regen is used for that braking).
Letting off the accelerator isn't braking, that's where the difference is.

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[cometguy]

I'd like to see something more definitive about the algorithm used for employing the brake lights when ACC is being used (as well as regen when coasting without pushing the brake pedal). I wonder if Porsche has this available anywhere...

 

[XLR82XS]

This is a simple problem that's been solved from the very first EVs and hybrids. As soon as the deceleration is over a certain amount the brake lights come on. Same thing for adaptive cruise control slowing the car down.

Recently I have confirmed the brake lights do not activate under recuperation even at max recup/g force. Auto or ON modes. This was on my 2021 RWD.

 

[B61]

Recently I have confirmed the brake lights do not activate under recuperation even at max recup/g force. Auto or ON modes. This was on my 2021 RWD.

That’s my finding as well.
brake lights could be activated only when you press on brake pedal.
personally, i think it’s a huge security issue.

 

[XLR82XS]

I don't see it to be a big deal since ICE cars/trucks engine brake with no light activation.

 

[B61]

I don't see it to be a big deal since ICE cars/trucks engine brake with no light activation.

But Not so hard as by autoregen and ICE won’t stop completely.
maybe i’m overreacting, but i don’t feel comfortable in traffic if i’m not using breaks,

 

[Skilly]

The car doesnt one pedal drive. If anything the brake light coming on with such a light impact on speed would be dangerous (and as the OP was wondering, look very erratic). Basic downshifting has more of an impact on speed that Porsche regen, yet they recoup energy better than Tesla...well done Porsche!

 

[rowi]

Wasn't it a legal thing, at least in Europe, that when the car brakes more than 1m/s^2 (or so), that the brake lights must illuminate? Would at least make sense. Regen will be less, I guess, so lights off. Unfortunately I'm mostly _in_ the car, so, it's hard to see. But I also thought of putting a mirror or voltage meter on to check this.

 

[Dr.D]

As the title says...tend to use the auto regeneration in rush hour traffic as it can be helpful for safety (I know not foolproof) . However do the brake lights come on when it activates or not?
TIA

The wife fancies herself as a bit of an uberjogger, so I’ll get her to jump out at the next hill and I’m sure she’ll see red

 

[Dr.D]

The wife fancies herself as a bit of an uberjogger, so I’ll get her to jump out at the next hill and I’m sure she’ll see red

 

[R Benny Waered]

They dont come on with basic liftoff regen. They do come on the second you touch the brake pedal though. I hate the notion that I'm looking like someone lazily resting my foot on the brake pedal so I tend to switch the steering wheel regen on when i want a bit of slow regen downhill - rather than looking like a nervous driver cooking his brakes for a mile!

I always wondered what is most efficient a slow long gentle regen or a short harder one?

 

[Jhenson29]

I always wondered what is most efficient a slow long gentle regen or a short harder one?

Should be slow as “none” would be most efficient. The more you use drag to slow down, the better. At least from a decel efficiency standpoint.

 

[O2TheL]

I've ridden motorcycles for decades and this is a common issue on bikes like Ducati's that have very strong engine braking characteristics when you come off the throttle. It's a problem for inattentive drivers behind you.
It really comes down to being aware of your surroundings because there really are so many crap drivers out there....plus cell phones

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