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This version was saved 12 years, 4 months ago View current version     Page history
Saved by Noah Vawter
on November 8, 2011 at 6:04:31 pm
 

Pedal Power to the People!  and other alternative energy sources!

 

This site has been created for us to share information and designs on Pedal Power, based on experiences during the 2011 Occupy movements.

Please join and help us document the electrical design.

 

Showing off the pedal power setup at Occupy Boston

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A Proposal for Standardizing Electrical Power

 

 

 

 


This diagram breaks things down into two categories: supplies and loads
Supplies are things you can plug stuff into to get power: generators (pedal and wind), and power / battery packs. Loads are things that use the power they supply.

It would be useful to declare some standards - 12 volt being the first one. One could imagine a scenario where all the occupies agree on a standard and an interface for things that create power and things that use it. If OWS needs more power for an event, Boston can send them a few of their generators for a couple days, and / or vice versa. You get all kinds of emergence and unexpected benefits when you standardize the interface as a constraint and then let people innovate what's behind it.

If we're using 12 volts, then we might as well use the cigarette lighter plug as the interface because there are lots of things that work with them out of the box. Aside from the many cell phone chargers, usb octopai, etc, you can get for your car, there are also a lot of cool electrical things made for RVs and boats, like coffee pots, slow cookers, refrigerators, and what have you. And marine grade 12 V cigarette sockets / plugs will actually lock in place.

This approach suggests we should focus our efforts in two places.

1. Make universal power regulators that can be used with (almost) any pedal generator

It doesn't take a deep understanding of electrical engineering to make a pedal generator: you just have to figure out how to turn a motor backwards. The difficult part is what to do with the unregulated, dirty, DC electricity that comes out of the generator wires in order to make it consistent, safe, and usable, so it can interoperate with all the things we might want to connect it to. Once a cheap power regulator is designed and made available, lots of people can then make pedal generators. They can order the assembled power regulator from sparkfun, or DIY it from plans made available, and then they're golden: hook up the two wires from the generator to the in, and then hook up the two wires for the out to a cigarette lighter socket. It doesn't matter that their generator looks or works differently than all the rest, as long as the output conforms to the standards.

A thumbnail first draft of a spec for the power regulator:
Contains a bridge rectifier so you can't pedal backwards and generate negative voltage
Takes in power ranging from - 30V to +30V and consistently outputs clean 14.5 volts ( which most 12 volt things can accept, and the extra couple volts are useful if you are charging a battery pack)
Consider using a largish capacitor so one can slow down pedaling or even switch riders for a second and still put out consistent power.

2.  Build Power packs with charge controllers

12 volts won't travel far on a wire without losing its oomph, and we can't put generators everywhere. So that means we need portable power packs to distribute power to where its needed on site. Batteries need charge controllers with simple interfaces to be usable by the masses. They should prevent over charge or undercharge, and they should tell the user when they are being charged or discharged, and approx. how much juice they have left. And it should make difficult to lick the terminals or short the leads, or otherwise do something dangerous.


User Stories:

Here are some user stories of how I could imagine this working as we scale up:
The cook notices the light is getting dim, so the next morning someone takes the power pack to the pedal tent, where they charge it for an hour or so. They bring it back, plug it in, and the lights are good for another few days.
One of the people in the media tent needs to work on their laptop all night, so they go the pedal tent and "sign out" a power pack and and AC 120 volt inverter (and possibly leave some kind of collateral). The next morning they return both to the pedal tent coordinator, who places the power pack in the "dead" queue. Legions of healthy young pedalers stop by throughout the day and charge it and the rest of packs back up, under the watchful eye of the coordinator / pedal power team.

 

Other sites we have been finding useful

 

http://www.econvergence.net/electro.htm

 

 

http://www.econvergence.net/images/electron.jpg

 

 

http://www.pedalpowergenerator.com/

 

 

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