Order A Permanent Magnet DC Generator For Your Project

There are two basic types of generators to choose from. Belt – Pulley style and roller style.   They can be ordered from Amazon or directly from us suing PayPal. We ship world wide. Watch the video below to see how it works.

DIY Spin Bike Generator for exercise Bike

Video Demonstration with Electrical Engineer  Bradley Whaley

PPG-B300300 Watt Belt Drive Generator
Dynamo with 2 inch pulley
datasheet pdf
user manual pdf
Amazon button Credit card order button

PPG-R300300 Watt Roller Style Generator
Rubber Roller Dynamo Generator
datasheet pdf
user manual pdf
Amazon button
Credit card order button


Dynamo Model

PPG-B300 (Belt / Pulley Version)    AKA  PPG-PM300-P

PPG-R300 (Roller Version)  AKA PPG-PM300-R 

Output Voltage Range 0 to 40 Volts DC
Nominal Current Rating 15 Amps
Peak Current Rating 20 Amps
Peak Power Output (Charging 12V Battery) 300 Watts (15V x 20 Amps)
Drive Type 2″ Diameter Pulley . 1.5″ Diameter Roller 60 Durameter
Peak Operating Temperature 100℃
Cooling Method Air-cooled
Shaft Bearing Type Ball Bearing
Mounting Bolt Size 6 mm
Wire Lead Length ~12″
Wire Lead Size Size 12 AWG
Approximate Weight ~8 Lbs
Number of Poles (Brushes) 4
Generator Type This is a DC permanent magnet motor being used as a generator.
Peak to Peak Voltage Varies depending on RPMs (See this output waveform)
Voltage Output Vs. RPM Voltage Curve Graph
Rated Operating Speed 2800 RPMs
Internal Resistance ~ 0.35 Ohms
Dynamo PM generator internal resistance bicycle generating for different currents
Dynamo Internal Resistance

Typical Amp-hours During 1 Hour of Use5 to 10 @12VTypical Power During 1 Hour of Use100 Watt Hours (0.1 KWH)



This data was recorded using a WattsVIEW power monitor while charging a 12V Deep Cycle Duracell Battery Powerpack during a one-hour charging session.

For more information see the FAQ WEBPAGE.   If you want to buy a generator stand ready to go out of the box then go  HERE.


Generator Voltage Output Vs. RPMs

The data below shows actual data from a belt – pulley generator during a one hour bike riding session.   Remember that Watts  = Volts X Amps.  So the 2nd chart below (green chart)  is Watts which is simply the product of the red (Amps) and white (Volts) lines of the first chart.

Chart 1


Test / Benchmark Results
Volts / Amps
Chart 2


Test / Benchmark Results
Chart 3


Test / Benchmark Results
Calories / Watt-hours / Amp-hours