You might like to check this comparison of dynamo efficiency [1]. The Shimano has as much drag with the lights off as on! It's missing the B&M [2] models though, which is a pity as they do a 12V 6W bottle model with a claimed efficiency of 70%, beating even the Schmidt. The LightSPIN had a similar verified efficiency so it's possible, but they're out of production now, and were quirky to get DC out of.
[1] http://myra-simon.com/bike/dynotest.html [2] http://www.bumm.de/ On Saturday 23 May 2009, David Reyes Samblas Martinez wrote: > in australia there is a company called www.pedalpower.com that has > the full solution, I trying to reach them but with any luck I will try > again tomorrow morning. but in parelell I trying to make my own > solution, just a aux batery able to recharge while charging providing > 500mA will do the trick, just precharge that battery and it will at > least be mantained by the dynamo. I still searching for one that > fits. For the dynamo hubs , my local bike workshop is searching for an > affordable one(shimano, afiline..), but the main problem is that all > dynamo hubs requires to unmount and remount the hole wheel, and this > is an added cost in the total amount. so he is also searching for > wheels with the dynamo hub already mounted. once I got information I > will post. > > 2009/5/23 Michal Brzozowski <ruso...@poczta.fm>: > > Ok, I wasn't specific enough. What I'm looking for is exactly that thing > > in the middle :-) that will output the 500mA or 1A through a USB. > > > > Is a bike dynamo powerful enough to provide the 500mA or 1A to charge the > > Freerunner? > > > > 2009/5/23 David Reyes Samblas Martinez <da...@tuxbrain.com> > > > >> look at http://www.sheldonbrown.com/harris/lighting/shimano.html > >> > >> but remember you will have to have a good voltage regulator or better > >> a battery charger able to charge itself and the neo at time, in the > >> middle, to avoid the current variance of the dinamo > >> > >> 2009/5/23 Michal Brzozowski <ruso...@poczta.fm>: > >> > 2009/5/21 Al Johnson <openm...@mazikeen.demon.co.uk> > >> > > >> >> If you want something effective for emergencies or extended periods > >> >> away > >> >> from > >> >> power a mechanical device is probably more effective. For cycling a > >> >> good > >> >> dynamo will provide more, and more reliable, power than any > >> >> bike-mounted > >> >> solar > >> >> panel. Other than that there are some good quality hand cranked > >> >> generators > >> >> available, along with a lot of bad ones. There are even a few devices > >> >> that > >> >> will take energy from irregular movement, a bit like a self-winding > >> >> watch. > >> > > >> > I'm looking for a bicycle or hand driven dynamo for use with > >> > Freerunner. Do > >> > you have any links where to find such devices? _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
