With an AC drive, there is no excuse not to use regen. It is built in,
and essentially free. At least equipment wise.
Regen has significant energy losses, however, so you should use it
sparingly, or at least knowledgeably.
Typical EV drivetrain losses are in the ~15% range, give or take.
Whatever the drivetrain losses, they at least double when you
regeneratively brake.
You first pay that ~15% toll on the way out of the battery, through the
controller, through the motor, and to the pavement. Then you pay the
toll once more pulling that same energy from the pavement, through the
motor, through the controller, and pushing it back into the battery. You
basically pay twice the toll, or perhaps 30%, to recover the energy with
regen. You don't get all the energy back.
If you drive a bit more conservatively, you can avoid expending that
energy extra energy in the first place, and then recovering that energy,
and paying the regen toll. Not quite as much fun, but you can perhaps
actually get where you plan to go. :-)
Bill D.
On 1/4/2022 2:12 PM, John Lussmyer via EV wrote:
On Mon Jan 03 15:02:46 PST 2022 [email protected] said:
On 3 Jan 2022 at 12:09, (-Phil-) via EV wrote:
For decades EV hobbyists dismissed regen as not worth the extra effort to
implement. "Just add another battery or two," they said.
That's a pragmatic answer when you've chosen a series DC motor, which is
really tough to use for regen. But in fact, under the right circumstances,
regen is like leveling out the hills.
Yup, and it REALLY depends on where you are driving.
95% of my trips are here on Whidbey Island. Yes there are hills - but they are
gentle, and there is only one where I gain a little speed.
So the only use for Regen is when I stop - and almost all of my driving is on a
highway with only about 3 traffic lights per trip, which aren't always stops.
Regen wouldn't give back very much in my situation.
--
Worlds only All Electric F-250 truck!
http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250
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