Re:(apologies) e- Assist Mark Garvey and anyone else w/ E assist..
- I realize my response below may have sounded curt, I wrote it in a hurry when I had
somewhere else to be. Never a good idea. My apologies.
--- In firstname.lastname@example.org, "Morgan" <mcgurme@...> wrote:
> The only reason I am "so in love with batteries" is that they are the only economically
> viable, mass produced item that is presently available with sufficient power density
> for a vehicle like a bicycle.
> Supercapacitors are great, but last time I looked, none of them come anywhere close
> to storing the 1/2 KwH of energy necessary for a typical e-bike. I would love to be
> wrong about that.
> Flywheels are also great, but for moving vehicles, have various safety and handling
> issues. They have to be encased in a very solid box so they don't produce shrapnel
> if the vehicle is in an accident - this alone would obviate any weight advantage. Plus,
> their high rpms mean that they will affect the handling of the bike. Again, I'd love to
> be proven wrong, but I've seen nothing close to a practical and affordable flywheel that
> I'd carry on my bike.
> What I have seen that's pretty nifty was an H2 powered bike at the recent bike show I
> was at in China. Looks awesome. Only problem was the price tag: about $6,000
> USD retail.
> Anyway, battery technology has drastically improved. It may be replaced in the
> future by something better, but I think that time is a ways off. Just look at all the
> investment that corporations like Toyota and GM have put into the new LiFePO4 battery
> (e.g. http://www.greentechgazette.com/index.php/batteries/lithium-iron-phophate-
> lifepo4-batteries-for-electric-vehicles/). I use one of these batteries on my own
> ebike, and at only 10 pounds, with thousands of cycles lifespan, and high safety
> quotient, it is hard to beat.