Descending steep mountain roads at 30mph?

ratsbew said:

Can regen alone keep speed under control (about 30mph) on twisting steep (7-10%) descents?.

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Yes, easily. You'll still have to use the accelerator a bit to limit regen.

Yes it can. I went through a 6 miles stretch of 8% decline in central Tennessee and regen was able to maintain any speed I wanted. (25-80mph)

Absolutely I have done it many times. No brakes required.

Easily. I've come down some steep mountain roads in the Asheville, NC area and the only time I'd have to use the brakes is occasionally on hairpin turns.

Yes. A bunch of us drove up Mt. Washington in NH then came back down. I only hit my brakes three times on the descent, but others made it down without touching them at all. It was foggy and I kept losing the car in front. That's my excuse for having to tap the brakes three times.

Average grade over 8 miles is 11.9% and the max grade is 22%.

Absolutely. Do it all the time coming down off of Wolf Creek Pass, etc.

If you have over 80% battery, and do long, sustained, downhill regens, you can hit regen limits that are similar to Supercharger taper charging limits. It's an obscure limit, but I have had it happen with a full charge out of Pagosa heading east over Wolf Creek Pass, and leaving Aspen with a full charge, heading east over Independence Pass. This limit is not an issue for short, pulse regens, and only happens on long, sustained regens.

Enjoy!

In the Winter you may run into having regen limited to due to a cold battery, and you'll have to use the breaks.