The round trip efficiency of the motor-inverter-battery-inverter-motor
is perhaps 50%.
The 15% number comes from the increase in range from having a car with
regen, versus one not having regen. In stop and go city driving, that
number can go much higher, thus the 25% increase in range.
Thus, regen efficiency is on the order of 50%, not 25% or 15%.
Of course, you are always better off driving more efficiently and
coasting to a stop, but that is not always possible, or even legal. :-)
Bill D.
On 8/24/2021 10:12 PM, Jay Summet via EV wrote:
On 8/24/21 2:56 AM, Martin WINLOW via EV wrote:
In an EV, much of the braking in stop/go energy can be recovered by
regenerative braking, thus the ’shed mass’ argument is severely
undermined. The same applies to hilly terrain.
I can't let this statement go unremarked as it propagates a common
misconception. Regen captures some of the power lost from braking or
going downhill, but the efficiency is probably 15-25% of the total
energy used to accelerate or climb the hill initially. So it
re-captures "much" more than an ICE vehicle does using mechanical
brakes that drop the energy as heat, but it is not a magic energy
recovery system. (Unless you have your vehicle towed to the top of a
hill, all of the energy re-gen captures came out of your vehicle on
the way up the hill or acceleration curve.)
Coasting without power is MUCH more efficient than stopping with regen
and then re-accelerating in a BEV (or an ICE for that matter).
Jay
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