Looking for an Electrical Expert - Summer Experiment

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ElectricVentures
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Joined: Sun Jun 20, 2010 4:50 pm
Location: Saint Paul, MN
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Re: Looking for an Electrical Expert - Summer Experiment

Postby ElectricVentures » Sun Jul 25, 2010 12:57 am

UprightEgg wrote:... We're mostly interested in this bike idea, and really the theme of energy powered by kinetic energy from Humans - so, hand cranks, bikes, etc. are the main focus. ...

In case its of use, note that Green Power Science has some videos on this subject and also offers a geared DC generator which might be useful.

See: http://www.greenpowerscience.com/BIKEGENERATOR.php .

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As far as hand crank electric generators, most of the ones sold to the public break in a matter of days or weeks. A notable exception is the Motorola Freecharge generator. It was designed for charging cell phones, but is extremely durable. I attached alligator clips to several and provided them to Science Museum visitors to learn about electricity. They've been running for several years without problem!

Here is a source: http://bellsouthpwp.net/p/a/pagerboy/

and a photo:

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otto_pjm
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Joined: Tue Apr 06, 2010 10:12 pm

Re: Looking for an Electrical Expert - Summer Experiment

Postby otto_pjm » Tue Aug 10, 2010 2:07 pm

How's this project going?
Need help?

Pete

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wammie
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Location: Minneapolis, Minnesota
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Re: Looking for an Electrical Expert - Summer Experiment

Postby wammie » Fri Oct 22, 2010 11:36 am

One more query: What's been the outcome of this project? Anyone know?

uptownmaker
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Joined: Tue Jan 13, 2009 8:26 am

Re: Looking for an Electrical Expert - Summer Experiment

Postby uptownmaker » Mon Oct 25, 2010 10:02 am

I delivered and set up the bike generator for them the night before they opened.

It turned out- unsurprisingly- that the amount of work required to power their lights was vastly more than could be reasonably expected of a person of normal fitness. Rough guess was a 6-8:1 ratio of pedaling time to use time, and that was NOT easy pedaling. Think riding a BMX-type one-speed bike up a steep hill and you're about right on the amount of effort.

In the end, though, I'd call it successful- that fact alone did a great deal to call attention to the degree to which we take energy for granted, and that was the goal of the project.

I haven't heard back from them since then, however.

UprightEgg
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Joined: Thu Jul 01, 2010 1:48 pm

Re: Looking for an Electrical Expert - Summer Experiment

Postby UprightEgg » Tue Apr 19, 2011 8:10 am

Hello TCMakers -we should have followed up here after the show opened! Mike is right, the project was a success in our eyes, too - the audience had opportunities to pedal the bike and we spoke with interested folks before and after the show about how the system was put together and how much work goes into generating electricity.


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