Re: Extending the range of an electric bike...

"ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message
news:9OkSh.7523$Cl.7009@xxxxxxxxxxx
1) That all of the energy was extracted from the battery
2) That the rate of discharge when running the bike is the
same as the rate of discharge at which the battery was rated.
3) That the range was limited to 12 miles.
4) That the battery was fully charged and in brand new condition.

These all come from the OP's post, which was, as you have shown above, vague
and technically lacking.

_Serious_ flaws for a design group.

Indeed. We should railroad that dave_mallon123 guy!

But let
me throw some "phoney math", based on facts, at you.
The Gossamer Albatross requires .3 hp to fly in still air. It
was driven across the channel (22.2) miles in 2 hours and 49 minutes.
To determine how much hp the cyclist could have generated for
42 minutes: 189/42*.3 = 1.35
: end phoney math :

That assumes constant energy, which is not at all likely for a human (at
least on the hourly scale). I know better than to make such a baseless
assumption.

Only if you allow the assumptions. It's a huge leap
from the "there is this much hp in a battery" math
to the "therefore we used that much hp".

No, it was implied by the poster. 12 miles [range], 17MPH, 36V "12A"
battery. If 12Ah is assumed to be meant, then a quantity of energy is well
defined, as is the time it was spent over.

Speaking of whom, he hasn't come back. We can only assume some more that
this is a useless argument anyway-- that is, we'll never get the information
needed to complete the problem at hand.

Tim

--
"Librarians are hiding something." - Steven Colbert
Website @ http://webpages.charter.net/dawill/tmoranwms


.

Relevant Pages

  • Re: Battery question
    ... One saying discharge down to 50% and then recharge, ... discharge down to 20% and then charge for maximum battery life. ... its probably an inability to fully charge them leading to sulphation. ...
    (uk.rec.waterways)
  • Re: Extending the range of an electric bike...
    ... same as the rate of discharge at which the battery was rated. ... That the battery was fully charged and in brand new condition. ... me throw some "phoney math", based on facts, at you. ... That assumes constant energy, which is not at all likely for a human (at ...
    (sci.electronics.design)
  • Re: Rechargeable 3v battery details for microcontroller (Cant lose data!)
    ... > Don't have a circuit draw yet... ... > case) milliseconds when awake on battery power. ... I went to the Duracell website to see if I could find numbers on D cells. ... If you discharge a Duracell D battery down to 1.1V, ...
    (sci.electronics.design)
  • Re: 2.6.28 - 2.6.29-rc6-git5 regression, p4-clockmod/cpufreq probably
    ... new minimum CPU frequency the governor may select. ... The discharge curves for a Lithium Ion cell below show that the effective ... capacity offset and the effect is common to most cell chemistries. ... the battery can be as much as double the specified capacity at the C rate. ...
    (Linux-Kernel)
  • Re: 2.6.28 - 2.6.29-rc6-git5 regression, p4-clockmod/cpufreq probably
    ... new minimum CPU frequency the governor may select. ... The discharge curves for a Lithium Ion cell below show that the effective ... capacity offset and the effect is common to most cell chemistries. ... the battery can be as much as double the specified capacity at the C rate. ...
    (Linux-Kernel)