Re: Regenerative Braking?


John Schutkeker wrote:
"Ron Wyckoff" <rwyckoff@xxxxxxxxxxxx> wrote in news:1141853023.258584.49280
@j52g2000cwj.googlegroups.com:

In the Prius, which is the best hybrid sys. out there right now,
regeneration works at up to 22KW down to 6mph. This provides for slow
deceleration, from 60 to 45mph in about 7 seconds. It's actually fairly
hard to keep from using friction brakes. On top of that overall
efficiency at 22KW is only about 37%.

Clearly there is plenty of improvement needed. We need at least 45KW
motor generator battery systems and hilgher efficiency super capacitors
to get total efficiencies above 50-60%. The batteries and caps that can
give this performance are in prototype stage now and we should be able
to get them in 2-3 years time.

What kind of volume will the caps take up? It's already hard enough to
shoehorn these battery tubs into the cars. Will there be room for the
capacitors?

Don't know about super caps, but the new Lithium batteries using
nanoparticle techniques have such low internal resistance that you can
discharge at 30C without temp. problems and can double the capacity
with equal weight. Check out a123.com, and


http://www.dewalt.com/us/articles/press_release.asp?Site=service&ID=1411

.

Relevant Pages

  • Re: Regenerative Braking?
    ... efficiency at 22KW is only about 37%. ... motor generator battery systems and hilgher efficiency super capacitors ... What kind of volume will the caps take up? ... shoehorn these battery tubs into the cars. ...
    (sci.energy)
  • Re: Stiffening Cap Theory
    ... I know that my cap goes into slow charge mode if it sees less the 10 ... But I have seen the older non digital caps shoot out some good sparks. ... BUT battery technology is becoming better and better. ... you can have a HUGE alternator and a shitty battery and still have problems, ...
    (rec.audio.car)
  • Re: Joule Thief - still not working....
    ... bit of energy from a battery, so the efficiency and useful life of the ... battery are apparently important. ... of the LM3914 - the LEDs aren't in series so I can ... Maybe you could look at the PICAXE system / chip? ...
    (sci.electronics.basics)
  • Re: power consumption batteries with awake/sleep modes...
    ... devices to analyze the efficiency of different wireless technologies. ... extend battery lifetime. ... More meaningful than resistor is a constant power model, ... be covered to power consumption by multiplying the energy ...
    (sci.chem.electrochem.battery)
  • Re: Enlightenment
    ... than current batteries--but battery technology is improving. ... using the energy to synthesize fuel then burning the fuel to get ... generating electricity, transmitting it long-distance, and using it to ... I'd expect at least 25% efficiency for the ...
    (rec.arts.sf.fandom)