The intention of this project is to build a straight forward human powered generator from a used bicycle and to use it to power light bulbs, blenders, cell phones, laptops, and other small appliances. This project will help one develop engineering skills while learning about a clean way of generating electricity.

The project was created as part of Infrastructure Academy's environmental technology curriculum for high school students, so it is intended to be both achievable and affordable.

Before continuing with the actual bicycle generator, one should understand how it works, and the components that make it up. View the PowerPoint presentation before moving on to the next step.

Parts Tools

- 2" X 4" Wood
- Wrench
- V-belt
- Saw
- Diode
- Wood screws or nails
- Battery
- Hammer or Screwdriver
- Inverter
- Tape Measure
- Wire
- Screwdriver
- Motor (12-V or higher)
- Perforated plumbers steel
(if motor does not have mounting bracket)

Note: The bicycle generator could be accomplished by skipping steps 5, 6, 7, and 8, to save money, but connecting anything other than a halogen lamp directly to the motor is not recommended due to the varying voltages.

Step 1: PowerPoint Presentation

Can you just use a altenator instead of a motor? Or are they the same thing... <br>
No they are not the same thing. An alternator is an AC generator which requires electricity to excite the rotors magnetic field (since there are no magnets in an alternator). When the voltage gets to about 12v+ it will disconnect the battery since it would have &quot;self excited&quot; the rotor by the electricity it is generating itself. The problem is, is that the alternator needs to be spinning at an a solute minimum of about 800RPM+ to start self exciting. You need to spin the rotor at about 1000-3000RPM depending on the alternators specifications in order to generate the amount of power its rated at / you want to generate.
<p>Does that mean a sufficient energy is still generated if the dc motor will be run up to 100 RPM? Thanks!</p>
<p>Is this battery rechargeable ? How does it work exactly ?</p>
What size diode do I need?<br>Greg.hoedt@gmail.com
I'm making this and I cannot figure out what kind of diode I need. What size???? Email me at Greg.hoedt@gmail.com
<p>I made this for my middle school science project. I just twisted the diode around the wire from the motor and held it in place with the clamp of the inverter. Why was the live wire from the motor the black wire and not the red wire? The red wire did nothing, but when I connected the black wire, the motor turned (before I added the diode)</p>
<p>if i understood this right , you need both wires connected to complete a circuit, current flows from negative to positive and without the diode the battery will power the motor as it can leak backwards causing the motor to move in the opposite polarity to the direction you are driving it to create power. </p>
Hello i am doing this same project. Did you do a display board for it? If so can you take a pic of it and send it to my email. My email is javanmsterling@outlook.com.
<p>i want to charge a 12 v 200amp battery with this method it is possible ? and i want to charge it in short time 20 to 25 mints ??? please reply some one ....</p>
<p>what if i hook the motor straight up to the chain instead of using a v belt and back rim</p>
Well the ratio would differ that's for sure.
<p>Thats Awesome!</p><p>but why use a motor? mechanical power from the bike is converted into electrical power, not the other way around </p>
Because a DC motor can work as a generator as well as vice versa. At the end if the day, its just a rotating coil inside a magnetic field - which obviously generates an electrical current.
<p>admin where are you?</p>
<p>admin where are you?</p>
<p>i want to charge a 200amp Battery with 12 volt dc car alternator it gives 30 to 35 amp in normal speed , on extreme speed i think 45 amp? it is possible ? how many minutes required to charge a 200 amp battery?can i charge the Battery with cycle Generator and at the same time can i use the Battery power with an 1000 or 3000 watts inverter/ups </p>
<p>will a DC 12V 50mA 5RPM 31Kg.cm High Torque DC Gear Motor work? It would be great to get specific details about the motor, diode, batery and inverter for those of us unskilled in the electronic arts.</p>
<p>I've been thinking of using a solar cell to charge my inverter <br>batteries, while I understand the use of the diode, the only problem I <br>have is how do you stop current being driven into the inverter circuit <br>by the motor/solar cell?</p>
<p>can i use a 12v 7 ampere battery </p>
<p>you should put this in the green design contest</p>
<p>i made it</p>
<p>I'm thinking mountain bike for the gears to get a flywheel going. Also, there is a double chain ring (the thingie thats connected to the cranks) Why not run another rear wheel on the front with another chain connected to the second chain ring and be able to turn 2 alternators at the same time?</p>
<p>what is the voltage that is poduced during cycling??</p>
<p>do u have a video for the second picture?</p>
<p>how do i make the second one do u have a vide?</p>
can i by any chance get a bicycle generator to store energy in order to produce electricity to run a builiding??
Could you possibly use a larger motor, and 6 batteries?? <br><br>And if you did what kind of inverter would you need??<br>
depending on wat u like to power up. small fridge, lamp, net work gear. 4000k would do nicely. then yr talking batteries. wat type do u plan to use seald lead acid, universal, or golf cart. golf cart types are the best but expensive. go universal cheaper plus u can get them from harbor freight for roughly 75 bucks or so.
What is the overall price of a project like this (if I already have a bicycle, anyway)?
from 100 too 200 dollars depending on the route u take.
I was wondering. What affects of a larger than 12V motor on the amount of electricity produced? Because I would like it as efficient as possible, without it being overkill.
go with a geo metro alternator abut 50 bucks +/- at a local auto scrap yard.
Where did you get the motor?????
correct me if im wrong but it looks like a 24 volt 250 watt electric scooter motor <br>
Is it ok to charge a 12 v battery with a 24v motor?
Sure In fact you need at least 15 volts to efficiently charge a 12 volt battery this is because of the internal resistance. I wouldn't risk going over 30 thou :D<br>
but take care of the current and make sure the current given to battery remains lower than the capacity of the battery if it exceeds the battery will be drained instead of being charged
is it possible to run an inverter straight from the generator without a battery? or do i need one for any excess energy produced? could i just use a capacitor?
yes of course you can ... but the voltage will surely vary on the speed you pedal. if the voltage goes high the inverter will take care but on low voltage nothing can be done..
Im not an expert, but you probably can, Yet, if you dont have a battery, you wont have any power if you stop, yet if you have a battery, it can charge the battery, so you can stop if you want.
note: i'll be using a charge controller
How much do you think this would cost? Minus the bicycle.
40 to 50 USD...and some hard work for the wooden frame...
I have a slightly more practical idea.. why not instead get an even larger motor and a Grid Tie inverter? then feed power right back into your house, why not? it would be heck of a lot simpler than the idea of setting up a battery and an inverter and plugging different appliances into it and best of all you could just do it whenever you want rather than preparing a device beforehand and save some electricity.
i think in the above instructables you can also connect your device directly to appliances while pedaling... but connecting to the main line power supply will not be advised. if there occur a back current flow from main line your generator will burn up...
Does the diode control the direction of the electricity?
here is a great way to go green and get some much needed exercise

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