Battery Charger Instructions and Parts List


We use the same generator (dc permanent magnet motor) as we did in the 120 Volts DC Bike Generator but instead of using a sheave and V-belt we press the cast iron fan of the generator against the rear wheel. The fan looks like a flywheel and came with your generator.

The fan is reverse threaded and threads onto the shaft of the generator. Make sure the fan rotates in a counter-clockwise fashion so while in use it does not come off and roll away (at 2000 rpm). Counter clockwise rotation may make the red wire negative but this is not a problem.

For a 12 volt battery charger application you will need a meter to indicate whether the battery voltage is increasing. This is the system charge controller. The meter costs $4. We include meters in all our systems for educational purposes.

You will also need a diode to direct the current flow into the battery. This is from Radio Shack. The white band on the end shows which direction of current flow.

We will send you the following parts and cables for free if you start to collect bikes for the Working Bikes Cooperative.

The circuit would look like:
generator -> diode -> battery

A bed frame (found in the alley) is used to get the rear wheel of the bike off the ground. Notches are “carved” in the bed frame for the axles using a hand grinder.

To use the power stored in the battery you will need an inverter which is also available from Harbor Freight at a modest cost.

“Pain Per View” variation.

The model we take to events has a 12 volt automotive relay. A relay is an electronic switch that prevents the inverter and appliance from operating when no one is pedaling. We order our diodes and relays from allelectronics. com instead of Radio Shack because we are “mass-producing” several bike generators a week.

We will send you all the following cables for free (not including the generator, battery, meter, inverter and TV) if you start to collect bikes for the Working Bikes Cooperative. This is a one volunteer hour and $10 in parts value. The “pedal per view” circuit would look like:
generator -> diode -> battery
generator -> relay coil
battery -> relay contacts -> inverter -> tv
battery -> meter