/diy/ - Do It Yourself

>>178831
The most difficult part is making sure you have a generator/alternator/motor that will output enough volts to just get over the voltage of your battery/battery array. If you have a 12v battery you want to charge then you need to output a STEADY 14.5v to 15v from your bike. Once you find a generator/alternator/motor that can do this for you, you'll need to find out the RPMs you need to pedal at to maintain this perfect speed. If your generator/alternator/motor runs too fast and outputs too many volts, you can use resistors to reduce it down to the level needed if you are maintaining a higher RPM on your bike. That way you can pedal and get either exercise or pedal at least fast enough to make pedaling worthwhile.

One good place to research is on instructables.com just do a few different searches for the same project. Read the comments too as they contain lots of good info.