What are you referring to, the Ford Tonka or some other regen 
system?  And are you addressing the issue of overall efficiency or 
the issue of whether regen is to be had down to zero speed without 
friction brakes, (which I don't think I've seen in a vehicle)?

--- In [EMAIL PROTECTED], "steve spence" <[EMAIL PROTECTED]> wrote:
> less than half of the braking power makes it back into the pack 
(12kw out of
> 30kw). on one test vehicle regen added a miserly 4 miles to the 
range (30
> miles instead of 26).
> 
> > In reading through that article, I have not come across yet any
> > mention of the regen braking working at slow speeds, but there is
> > some extensive discussion of the hydraulic approach being better
> > efficiency than others.  I question the efficiency comparisons 
they
> > make.  I think some electric oriented regen systems get much 
better
> > than what they're claiming, but perhaps I'm wrong.



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