On 11/13/2013 11:25 AM, EVDL Administrator wrote:
On 13 Nov 2013 at 3:33, brucedp5 wrote:
Conventional batteries take so long to charge that they cannot efficiently
store braking energy.
Hold on there! A lead-acid battery can be charged at thousands of amps if
it's below 80% SOC.
To view it from another angle, a battery can usually charge as fast as it
can discharge. I'm sure there are exceptions, but in my experience, most
drivers seldom decelerate dramatically faster than they accelerate.
That said, supercaps have been shown to be useful in mitigating peak
currents on discharging, and maybe this would help too on charging. But I
suspect that further battery refinement - and the extra cost of the caps -
will make this a moot point.
I also noticed the poor quality of the article also and intended to
comment on it at the time.
I guess he is thinking of not BEVs but hybrids with relatively small
batteries.
As far as I know, ALL BEVs with regen capture an acceptable amount of
braking energy. A Tesla S (warm with a not full battery) can regen at
60kw; that covers probably more than 90% of braking needs. I have no
personal experience, but I suspect even the small battery in a Volt
allows an acceptable job of regen.
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