I believe the prev issue of HomePower had a article about home exorcise equip.
being modified to gen for the home. It lists some data and ideas. I loaned my
copy to a co-worker and havn't gotten it back yet. I hit him up for it tomorrow.
> Date: Wed, 24 Oct 2007 16:43:16 -0500> From: [EMAIL PROTECTED]> To:
> [email protected]> Subject: Re: [ElectricMotorcycles]
> generator efficiency question> > > John,> > First off, this topic is probably
> more appropriate for an electric > bicycle or dc generator list/forum.> >
> FWIW, I'm not an engineer, so this may be wildly inaccurate, but here is >
> what I think I know:> > Multiply the efficiencies and subtract a few percent
> to account for > other losses to get an estimate. Assuming 80-85% efficiency
> for both > the generator and the motor and that the energy generated goes
> directly > from the generator to the motor, I would estimate that it's around
> > 60-70% efficient (80%*80%=64%). If the generator is only 40-50% >
> efficient, then it would be closer to 30-40%.> > Generators have a peak
> output within a specific range. They range > pretty much from 0-95%
> efficiency. If you can keep the rpm in the best > range, the efficiency will
> be better, but what the % curve will be is > entirely based on the generator.
> Staying within that optimal range may > be difficult. You will need to spec
> out the generator motor carefully > and may need to add gearing and a
> flywheel. An overrunning clutch may > be useful as well.> > If the energy is
> stored in the battery and then used by the motor, that > adds another
> efficiency hit. If you are pedaling while the motor is > operating, I think
> most of the juice should be used directly, but don't > quote me on that.> > I
> would try very hard to go direct drive before I even considered the > pedal
> powered generator option. The generator is probably more trouble > than it's
> worth.> > Hope that helps.> > Seth> > > > john fisher wrote:> > I am thinking
> through a high-powered 3 wheel elec-bicycle. For > > packaging reasons, using
> the human-powered drive component through > > direct drive is awkward. So
> what I am wondering is how much efficiency > > would I give up by pedalling a
> generator/alternator and charging the > > battery.> > assuming:> > the human
> produces about 150W steady> > a few pounds of extra weight is acceptable.> >
> the direct-drive efficiency is basically 100%> >> > any opinions? is it a 50%
> loss? even greater?> >> >> > John> >> >>
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