garygid wrote:If the battery gets "full" (quite possible) and there is no place to "dump" 35 kW of power, the Regen is basically useless.
So, on the long trip home from Tahoe, the mechanical brakes will get ... VERY hot!
So, yes, brake heating is an important, even vital, safety issue.
I think you are going to need a different example. I'd be willing to bet my $99 deposit that if you leave Lake Tahoe (say near the casinos) with a full battery you will never need to dump regen power on a trip to Sacramento, even though you start at elevation 6250 and end at elevation 50.
My reasoning? In the first place, you have a 1000 foot climb out of Lake Tahoe before you start going downhill. That (and the maybe 15-20 miles involved) is going to knock your battery charge down quite a ways. Second, I doubt if regen going down a hill can ever recover more than half the energy needed to get up the hill, and there is quite a bit of up and down between Tahoe and Sacramento. Third, that's a 100 mile trip, and I'm confident you would make it because of the elevation change, but I think you will have no more than 10-15% charge left when you get there.