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converting exercise bike to power generator. what do I need?

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Posted by manfromvie on October 27, 2012, 2:49 am
 
I am planning to convert an exercise bike to a power generator in the follo=
wing way: the belt of the exercise bike drives a hub which has the front sp=
rocket of a mountain bike attached to it. A bicycle chain drives a standard=
 six speed sprocket (gear) set and derailleur of a mountain bike attached t=
o a hub which also drives a power generator. My ideas that I could switch g=
ears if I wanted a higher workout. I hire work out at a lower gear would me=
an that the power generator turns faster. So here are my questions: since I=
'm charging a 12 V battery the power generator cannot output of a higher vo=
ltage but must output more amperage when it turns faster. can anybody recom=
mend which cheap power generator I should buy which changes amperage not vo=
ltage with higher rotation speeds? What else do I need? Thank you very much=
 for your input.

Posted by clare on October 27, 2012, 3:52 am
 
On Fri, 26 Oct 2012 19:49:21 -0700 (PDT), manfromvie@gmail.com wrote:


way: the belt of the exercise bike drives a hub which has the front sprocket of
a mountain bike attached to it. A bicycle chain drives a standard six speed
sprocket (gear) set and derailleur of a mountain bike attached to a hub which
also drives a power generator. My ideas that I could switch gears if I wanted a
higher workout. I hire work out at a lower gear would mean that the power
generator turns faster. So here are my questions: since I'm charging a 12 V
battery the power generator cannot output of a higher voltage but must output
more amperage when it turns faster. can anybody recommend which cheap power
generator I should buy which changes amperage not voltage with higher rotation
speeds? What else do I need? Thank you very much for your input.

I've got a better idea. Come and get the one I have sitting out the
back. It is a commercially built execize bike that used an alternator
as the load cell. Chain drive to hub on 12 or 14 inch pulley that belt
drives the alternator. Needs new belt, seat, and other bits - but the
basics are all there, in Waterloo Ontario.  Cheap.

Posted by Vaughn on October 27, 2012, 5:48 pm
 On 10/26/2012 10:49 PM, manfromvie@gmail.com wrote:

following way: the belt of the exercise bike drives...

Serious question: Why?

You can find many threads here explaining why this is usually a bad
idea.  They are easily searched, so I see no need to restart them.

Posted by manfromvie on October 28, 2012, 9:06 pm
 Please don't try to talk me out of it. I want to do it. So I would appreciate
constructive advice. I am leaning towards a car alternator because they are
easily available, cheap and have the regulator built in. Thank you.

Posted by clare on October 28, 2012, 10:13 pm
 On Sun, 28 Oct 2012 14:06:26 -0700 (PDT), manfromvie@gmail.com wrote:


constructive advice. I am leaning towards a car alternator because they are
easily available, cheap and have the regulator built in. Thank you.

 Want a picture of a commercially produced unit (what's left of it)?

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