- May 22, 2020
- Reaction score
- North America
- Taycan GTS, Cayenne Diesel
Porsche is right… the round trip from recuperation is more inefficient than coasting.Interesting thread. In a year/9K miles of ownership I’ve always had regen on because I thought it was/is the best way to maximize range. Now I’m not so sure after reading this thread. I’ll try coasting for a week at least BUT it will be a major adjustment as I’ve gotten used to how the car drives and feels with regen on.
When power flows to the motors, it has to go through a DC/AC inverter, and during recuperation, there is a reverse AC/DC conversion. The motor itself also has losses. Suppose the motors are 98% efficient in either direction, and the inverters are 99% efficient. Then a round trip from battery to motor to kinetic energy and back is going to be 0.99 x 0.98 x 0.98 x 0.99 = 94%, so you lose about 6% energy compared to just coasting to avoid the round trip.
in actual practice the losses will be higher, so round trip efficiency will be lower.