Instructables

Generator from scooter motor

This project came about because someone cut the power line going to my house. The power company was slow to fix it, so I cobbled together a way to charge auto batteries for my invertor.

The generator is the motor from a discarded electric scooter ( model MY1016 from JX Motor Co., rated 24v input and 2750 rpm). I removed the motor, it’s drive chain, and sprocket wheel and attached it to the frame of a discarded bike. The pictures show the details.

By cranking furiously, I can charge a 12v battery with about 3/4 amp of current. There is a small epoxy rectifier to block the battery from driving the motor.

This thing was made from parts on hand and cost me only the assembly time. I don’t have any sources or price lists.


Picture of Generator from scooter motor
dlbott2 years ago
I have an old scooter and had thought about doing this. I am not very handy though and need more instructions. Please let me know when you complete your next instructable. This is the type of generator I would like for home use. I hope to charge 12 volt or 24 volt car or marine battery so which will apply charge back into house grid. It is first step to hopefully having the ability to have power when the hurricanes come. Even if it is limited lighting or hopefully to be able to cook with etc.

Thanks

don
ShutterBugger (author)  dlbott2 years ago
Hi Don,
I have been putting off doing an instructable. I need to get back to it. The device currently looks very different from the first effort depicted in the photos. I need to make much bigger pictures so the details are visible.

The generator device that I built will charge 12 volt batteries, but it takes a lot of effort if you use pedal power... pedaling only produces about 60 to 70 watts. By working hard for a few minutes, I can get about 100 watts.

The design has turned out to be long lasting, as I have yet to wear it out from many hours of use.

In the mean time, start collecting junk bike frames and parts, along with chains and a comfortable seat. And get a chain tool. Get some scrap plywood and 2x4's. Use a volt meter to find low resistance diodes. Keep the chain and sprockets from the scooter motor.

I'll start work on this next month (May).
~Bob~

I'm confused, in the 'ible you stated 3/4ths of an amp at 12V, or did you mean 3 to 4 amps at 12V? Either way, that is 36W to 48W, not 60W to 70W, and then how do you mean that working for a few minutes you get 100W?

Watts used in this form mean watt hours. If your pedaling produces 4A of current at 12V, and you continue to pedal at this steady rate for an entire hour, then you have produced 48W in total.

Well, actually actually about 15% more than that since the full charge voltage of a 12V SLA battery is closer to 14V than to 12V.

ShutterBugger (author) 4 years ago
I should mention that you need a chain tool to adjust the bike chain to the proper length.

Also, bike chains are not identical. You need to make sure the chain matches the spacing on the sprocket teeth.

I used wire cutters to remove the spokes and rim from the rear wheel.
~Bob~
Kiteman4 years ago
Do you sit and pedal?  Or crank by hand?

You should really post this as a "proper" instructable, even if all you have are pictures of the final result (you can be forgiven for not having pictures of a project built in an emergency).


ShutterBugger (author)  Kiteman4 years ago
I didn't post as an instructable because the description is so short and there is no parts list. It was intended as an inspiration to those who like this kind of project.

You can sit and pedal... that was my original idea, but it is easier to crank by hand. I should gear it to drive the generator faster so it would be easier to pedal.
~Bob~
lemonie4 years ago
Looks good, you could expand it to a slideshow.

L