3 ms·

Regen efficiency is nowhere near 100% though. You still lose a lot due to friction/conversion losses/etc.

• vel0city 3y ago
  You don't need to do regen to get that energy back. Your car gets significant air and rolling resistance going down the highway, its having to put in energy to keep the car going 40+mph. Using that stored kinetic energy of just going down the hill is extremely efficient so long as you're not having to do any braking, which unless you're rolling down a mountain you probably don't need to "ride the brakes". Hence my "unless its a steep grade". The energy does not need to go back into the battery. It offsets the energy needed from the battery to keep the car going at speed. Regen efficiency makes no difference in most hills, because you probably won't be using the regen for it.