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[Richard230]

Leave it to me to experience something weird.  During the last couple of rides I have lost regen for all modes at 99% SOC.  Oddly, I have it at 100% and at 98% and below. Makes no sense to me.  I just hope it doesn't start dropping regen at other SOC levels.  I might add that the weather has been very dry and around 55 degrees F in the morning when I leave my home, so I can't blame moisture. 

[BrianTRice@gmail.com]

Does the lack of regen follow a period at 100% where you are using regen for the majority? Like, you live on a pretty tall hill and regen downhill as you leave home, and then the regen gets disabled temporarily.

Because, as I recall, regen gets disabled based on the battery voltage, and regen (confirmed with measurements) causes "lift" or a kind of dynamic spike in voltage which may exceed the normal range considerably.

SoC may descend based on current and estimation while ignoring voltage for a certain amount of time.

[DonTom]

Leave it to me to experience something weird.  During the last couple of rides I have lost regen for all modes at 99% SOC.  Oddly, I have it at 100% and at 98% and below. Makes no sense to me.  I just hope it doesn't start dropping regen at other SOC levels.  I might add that the weather has been very dry and around 55 degrees F in the morning when I leave my home, so I can't blame moisture.

Happened to my SR and my DS since the last FW update. 

This house is on the very top of a hill. Too much regen can over-charge the battery. It SHOULD turn off regen, I was surprised Zero didn't turn it off at 100% from the start.

My Energica does the same, but it gives me a warning that Regen is NONE at first then at around 98% SOC it gives an indication for weak regen and then at around 96% I get full regen.

I can get nearly 20KW regen on my Energica, so they better turn it off on a fully charged battery! But this means I need to use the brakes when I first start out as this is a steep hill. But I can always stop the charging before 100% and then not have to worry about it.

BTW, I have also noticed I get  full regen at 100% SOC on my Zeros until regen  has been activated and deactivated once and then it drops out for a while and then comes back and then it stays as normal. I really never thought anything of it, but I first noticed it after the last FW update.

The Energica has no regen from the very start at 100%. Perhaps the Zero needs to see a little regen on a fully charged battery before it knows to turn it off for a little while.  Perhaps that is just how it works.

Either that or we both have the same problem and on three different bikes.

-Don-  Reno, NV

[BrianTRice@gmail.com]

Zero did used to disable regen until battery voltage descended enough to allow it. Then it relented to owner demands to allow over-voltage during regen for a short time period, under the assumption that most rides would quickly bring that down back into the normal band.

[Richard230]

I live on a 1/8 mile long hill. If my bike has just been charged to 100% regen, the regen will cut in and out until I get down to the bottom of the hill at which time regen will activate steadily from then on even though the SOC is showing 100%. But this week, when the SOC hit 99% regen would cut off, even though I am braking in custom mode that is set at 100% regen.  I also tried sport and eco modes and they didn't provide regen, either.  However, when the SOC hit 98% regen returned and stayed active for the rest of my ride, which today showed 78% by the time I returned home. This problem just started three rides ago. Strange, but so far it has only been a little irritating. I just have to use the brakes a bit harder without regen. I just hope it doesn't get worse.

[Curt]

Cars do the same thing for battery protection. The Chevy Bolt EV has a mode historically called "hill top reserve" for people like Don who live at the summit of a mountain. It limits L2 charging to a configurable max such as 90%, and it's location-based so it only limits home charging. If the Bolt is fully charged, regen only kicks in after several miles. It's actually pretty disconcerting when regen is off because it's unexpected and the normal brakes are terribly wimpy.

[BrianTRice@gmail.com]

I live on a steep hill in SF with a quarter mile stretch down to the main road / highway entrance. With my new bike (2020 DSR), I've been looking for regen cutout on this stretch when I leave with a full charge, but I haven't seen a regen cutout so far.

Regen only really cuts out based on high speed (is it 70mph still?), low speed (13mph when implemented), and high voltage as discussed above.

You can always check your logs for faults, I suppose, but so far it sounds at least like the bike is functioning relatively normally. I mean a regen cutout isn't usually a malfunction per se.

[Richard230]

My 2014 S used to cut out all the time when SOC was 100% and I was riding downhill.  That bike hit 100% SOC when its voltage was 117 volts.  My new bike cuts power when the voltage hits 115 volts. I figure that Zero reprogrammed the BMS to cut power at the lower voltage to prevent regen cutout when the battery pack was topped out and the rider was braking downhill, thereby cutting rider complaints at the same time.

[Crissa]

My 2014 doesn't do regen at all above 94% or so.  At 100% I get a great coast - something I can't get even with throttle regen turned off.

Some cars use a bank of resistors to mimic regen at high states of charge so the performance of the car seems unchanged?

-Crissa