| Re: electric bikes on centuries
Bill Bushnell wrote:
> In article <tyywh.57696$wc5.41704@newssvr25.news.prodigy.net> ,
> Bill Baka <bbaka@comcast.net> wrote:
>
>> The electric could, as you say "help" on the hills, but not enough power
>> in any batteries I have ever seen for multiple thousands of feet.
>
> You must have missed one of my followups.
Entirely possible with these really active threads.
>
> 5000 feet of climbing on 350 watt-hours has been observed with a not
> particularly lightweight but efficient pedal assist system, geared
> properly, in combination with a significant contribution of a fit
> cyclist's pedaling power.
Gearing was my concern about using an electric to climb with. If it is
geared for flat street use then it may not be much help in a climb.
The method of getting the power to the road is a big factor in how
efficient the motor can run.
>
> 350 watt-hours is possible with a 24volt/20Ah lead-acid battery that
> weighs about 30 lbs. Using a Lithium battery of equivalent weight ought
> to give three times this much climbing range.
>
Lead-acid batteries get killed pretty fast with a full discharge so I
would think that a NiMh would be the minimum battery technology to use.
Lithium might work better (It will) but cost too much.
It seems to be a matter of how much do you want to spend.
Bill Baka
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