TonyWilliams wrote:Scowbay wrote:Newbie question: is regen disengaged when in neutral? Is the idea that it's more efficient to coast at high speed than to use regen which slows you down and makes it necessary to apply power sooner?
Yes, no regen or power in Neutral. No regen at 100% battery.
Coasting uses no power and gains no power (beyond the static loads of climate control, radio, lights, horn, etc).
Regen takes energy to produce (that you could be freely rolling) of which there are losses to put that power in the battery, and losses to extract it. It also means you used too much energy prior to the stop sign to need brakes/regen.
If I accellerate at 80kW (max available), I only have about 40 kW max of regen available to slow down. 50%, and that doesn't include all the losses mentioned above. Obviously, that's not normal driving, but even the best case scenario doesn't equal coasting.
Ideally, you would coast to every stop sign, meaning you only used enough power to get to the stop. Naturally, this won't work on a down hill portion before the stop, which will require braking (either friction or regen, or both).
This is a little misleading. The round trip efficiency had been shown to be near 85% by multiple people. So if you break using regen, you will be able to accelerate back to 85% of the starting energy. The fact that regen is only 1/2 the max acceleration only means you cannot brake as fast as you accelerate without engaging the fiction brakes. It doesn't limit how much of the energy you recover, though. Just the rate at which you recover it.