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[ESokoloff]

I found 100% braking regen to lock up the rear a little too easily.  So I'm doing 30-60 throttle-brake.

-Crissa

In my Dreams....

I wish Regen had a greater force but it might be my fault.
I’m guessing your not hauling around as much weight as my 16 DSR is.
190# fully suited rider with a side bag of tools, cable lock, air compressor etc.

[JaimeC]

Even just riding solo with NO luggage, 100% regen doesn't get anywhere NEAR locking the rear wheel.  I suspect the highway department near him must treat the asphalt with vaseline nightly; there is no other explanation.

[Crissa]

I live in the mountains on very steep hills.  I also have the lighter of the S frame models and I carry much less gear than the rest of you apparently!

During hard emergency braking I nearly always lock up the rear, and I've had it slide out before getting my foot on the brake pedal (too much front brake, clearly).

Since that first mile colors every ride, I'm going to change my settings to reflect it.

I can't seem to get that 100%-coast intentionally in the throttle regen settings, either.  So I chose just enough that I can coast down my hills and sometimes brake, while still getting some regen.

Your results will vary by your ride, too!

I flip between Eco, Sport, and my settings pretty frequently.  Sport has high throttle and braking regen while Eco seems to have a middling amount of throttle and less braking.  So it works out for me to have something in between the two for most of my riding.

-Crissa

[JaimeC]

"Locking the rear wheel?"  I see you have a 2014 model.  I know my 2016 had ABS, and I know Zeros originally DIDN'T have ABS... I'm guessing your model doesn't have it?

[Crissa]

I don't know which models have ABS and don't, but yes, mine does not.  ABS was slowly phased into the model lines.

ABS doesn't help if regen is too strong in slick conditions.  It only modulates the brake pads.

Since regen is based in the controller, it would be possible for a traction system to override it.  Zeros don't do this yet in any model that I know of.

-Crissa

[remmie]

I don't know which models have ABS and don't, but yes, mine does not.  ABS was slowly phased into the model lines.

ABS doesn't help if regen is too strong in slick conditions.  It only modulates the brake pads.

Since regen is based in the controller, it would be possible for a traction system to override it.  Zeros don't do this yet in any model that I know of.

-Crissa

The SR/F and SR/S have drag torque control that limits regen if it is detected that the rear wheel locks up during (strong) regen. 

from the owners manual "When decelerating, the drag torque control (DTC) manages the drag on the rear wheel by increasing or decreasing the levels of power regenerated. If the wheel speed sensors report rear wheel slippage upon deceleration, the DTC functionality will automatically reduce the amount of drag torque to assist in maintaining rear wheel traction."

[Crissa]

Thanks, remmie!

That's cool that they added it.  It's much easier to add to an electric than an ICE.

-Crissa

[BrianTRice@gmail.com]

There's so much going on in this thread... I'll address some points:

- Regen does have an overhead, to produce a stator field. Regen has an efficiency/effectiveness curve with speed, as I understand it. Regen has been historically disabled at low speeds (<13mph) because it doesn't recover energy higher than the amount required to produce the stator field. There's an MBB setting for it.
- Zero rolled out ABS support across their model line in 2015, which involved a heavy retooling and investment in Bosch equipment. It wasn't gradual.
- Drag Torque Control support on SRF/SRS models is exactly what we all hoped for on SDS models, but I've heard conflicting reports on whether the Sevcon can implement this correctly or if it's just an R&D hangup. Hopefully that's a feature that gets rolled into firmware updates some day.