Instructables
Picture of BikeGen
BikeGen 136.jpg
BikeGen 164.jpg
BikeGen is a small power generator, mounted to a bike, that recharges two AA batteries while you ride. The batteries can then be used to power the lights on you bike or you can take them out and use them in your other electronic devices. BikeGen also has a standard car 12v power outlet that could be used to recharge your Ipod or cell phone.

This is an updated version of my original Bike Generator. The first version served its purpose but was fairly limited. BikeGen, is better in almost every way and here are some of the reasons why:

1. The generator motor is now mounted with more rigidity to the rack instead of the frame.

2. The friction drive wheel is mounted to the motor with a clamping coupler and now runs on the braking surface of the wheel and not directly on the tire.

3. BikeGen recharges two AA batteries instead of powering the headlight directly, so the lights stay on even while your stopped.

4. Two AA batteries are used to power both the head light and the tail light, which means I don't have to bother buying AAA batteries for the tail light.

NOTE:Please read my Bike Generator Instructable and follow the steps about building the the circuit board before attempting to build BikeGen.

 
Remove these adsRemove these ads by Signing Up

Step 2: Get the Materials

Here is all the materials I used to build BikeGen.

Raw Materials
Aluminum Angle 3/4"x3/4"-1/16"thick
Aluminum Angle 1-1/4"x1-1/4"-1/16"thick
#6-32 All-thread

Hardware
4 - #6-32 nylon-lock Nuts
2 - #6-32 x 1-1/2" long Machine Srews
2 - Springs
2 - 1/2" #4-40 Stand-offs
4- #4-40 x 1/4"long Machine Screws
2- #4-40 Nuts

Electrical Parts
18 gauge wire - roughly 25ft
2 - DPDT switches
12volt car outlet
2200 ohm resistor
Battery Holder for 2 AA batteries
D-Sub connectors
Everything used to make the Bike Generator

Other Needed Items
Small Plastic Organizer Box

GhaneshP12 days ago

Good One. Thanks for sharing with world.

Any rough idea on what is the RPM at which the generator dynamo is rotating? And what might be rough Nm force acting on dynamo? I might sound too technical, reason is I have been thinking of similar idea but on higher gererator capacity. Like using such spindle DC motor(can be used as generator as well) http://www.aliexpress.com/item/-/2008958915.html

I read that this generator has less clogging and should start up with little force. But the rated RPM is high. So am checking with you to get rough idea.

My other option include using below motor to generate high power. (ony thing need to find a good bracket)

http://www.aliexpress.com/item/6-Inch-Hub-Motor-fo...

You can ask me what am I going to do with such hugh power generated.

Well, the plan is to feed it to the hub motor. Trying to see how to increase mileage of my 36v 10AH battery. So once I initiate the drive of hub motor from battery and get bike momentum, a relay will cut off power from battery and start using power from generator.

http://www.aliexpress.com/item/Mini-motor-36v-250w...

This whole idea fireoff in me after I saw this freewheel based free energy video

Please do share what you think on the bicycle rpm and force.

Elliottl29 days ago

Does anyone know of any patents that may be similar to this, and why didn't the maker mass produce and sell this idea? It seems like a simplistic idea, and explainable to the average person, and it would be something I would buy for my own bike.

dbc1218 (author)  Elliottl25 days ago

search for bike dynamo or hub generator, devices like this have been a round for a long time and are well developed. In places where bikes are used by many more people these are much more common. In the US the mass market doesn't ride a bike so its not as important.

mattman21 year ago
why not mount the controls between the goose neck and the forks
stevo69nz3 years ago
I flagged the idea of a generator and have gone solar, connected to batteries that inturn power my lights a night, the usb for charging my mp3 player is currently being sorted, photo's on the way :-) cool as idea(any sort of charging system), especially if you are on your bike a lot
greezus4 years ago
 so clueless about electronics...wish i wasn't, but it's one of those things that i just don't get. ugh!!! was just checking out yr previous 'ible, and together these are great!!!

it does everything i want it to do- especially for touring by bike, but i just feel lost. maybe it has something to do with being left handed, although i doubt it. i probably just got dropped on my head as a baby too much :)

thanks for making this though!!! hopefully i can find a friend that understands this better than i do...
Kid Ninja4 years ago
Would it be possible to charge one of those batteries that they use for the little tyke cars?  You know like those battery powered trucks kids ride in.
rpvanpatt4 years ago
 hey just quick question, would it work if I just took the circuit and switch directly to a car output? 
TOCO4 years ago
 where did you get the car outlet?
dbc1218 (author)  TOCO4 years ago
radio shack

TOCO dbc12184 years ago
I purchased one jan 16 when I had to go get some diodes and stuff.
knektek4 years ago
does your generator produce pure dc? if not use a super cap in parralel to your inputs on the generator (+ and -), pedal for a bit and then turn on. result = saw tooth sine wave.
(removed by author or community request)
you could make two and put one on each side of the back wheel
seandogue5 years ago
(removed by author or community request)
dbc1218 (author)  seandogue5 years ago
I recently rode about 15 miles with this and never noticed any extra load on the bike. It makes a humming noise but I couldn't really hear it over the wind. I plan on measuring the current, I'll let you know.
volto5 years ago
Why not just power the lights directly from the generator, and skip the batteries?
dbc1218 (author)  volto5 years ago
Thats how my first bike generator worked but then when you stop the lights go off. Plus I'd like to be able to take the headlight off and use it as a flash light.
why not mount the electronics on the rack? or elongate the whole setup to fit on the seat tube or under the saddle?
dbc1218 (author)  josephcherng5 years ago
right now I'm using two switches to control the charging and the lights so I needed to mount it up front. I would like to build a single circuit that would keep the batteries charged and keep them in the lights themselves and have no switches so all you would do is hook up the lights and go, but I'm working on a few other projects and this has to go to the backburner.
T.R.5 years ago
How long does it take to recharge AA batteries with this setup?
dbc1218 (author)  T.R.5 years ago
I recently rode about 15 miles while charging the batteries the entire way. They went from completely dead to just under their rated voltage. This was about one and a half hours of riding at a steady pace as well. The charger for the batteries said it could charge these batteries in two hours when plugged into a car so I think this is pretty decent performance. So it can fully recharge the batteries but its probably better suited for keeping them charged.
an you please add a easy pdf of it all but with a stepping motor with the type of 0h4018s2015 so i can do it on my bike lol would you be able to make an easer circuit for it and please add how to add a usb port and can u rember that it is only 15V 0.5A. and how do i tell witch wire is witch when there are 2 browns, and i need to kno how to work each wire as there is 6 of them and not 4. how can i make a generator with theese.
IMG_1372.JPGIMG_1373.JPGIMG_1380.JPGIMG_1389.JPG
(removed by author or community request)
dbc1218 (author)  james.mcglashan5 years ago
In theory it could propel the bike as well as generate power, but it would be so under powered it wouldn't be worth it. I don't think the friction drive would work though, you would have to connect the motor to the wheel with a chain probably. Check out the Bonix hub motor kits, they have a really nice regeneration function to recharge the batteries when you ride as well as power the bike.
imakethings5 years ago
can it charge 4 AA batteries?
dbc1218 (author)  imakethings5 years ago
As I built it, it will charge 2 AA's, which is what I wanted to power the lights. But you could use a charger like this Energizer 15 Minute Charger to charge 4 AA's because it has the car power outlet option. Just plug it in the outlet on BikeGen and charge all six batteries at once. I don't know how long it would take to charge them though.