Order A Permanent Magnet DC Generator To Charge A Solar Generator Or Portable Power Station.

If you do a search for the phrase “Solar Generator” you will see hundreds of options like these shown HERE. A solar generator is just a fancy name for a (usually Lithium) battery portable power station that has a built in charge controller that can handle a wide input Votlage from a solar panel. A normal portable battery powerpack power station just takes a 12V DC input.

What some people do not realize is that a DC bike generator dynamo can be used to charge a solar generator. The tricky part of it is finding out the maximum Voltage allowed into the solar generator and setting up your generator so that it DOES NOT EXCEED that maximum Voltage. An easy way to find this out is to opne a search on Amazon or Google or your favorite search enginer and type the model of the solar generator along with the words Specifications PDF. Then look for Input charge Voltage There are three ways a pedal power bicycle generator can be configured to charge a solar generator :

  • OPTION 1 – A single 300W PPG-R300 or 300W PPG-B300 generator will put out a max Voltage of about 50VDC. So to be save you would do a search for a solar generator that could handle a charge OCT or maximum input Voltage of 60V DC or higher and connect your bike generator to it. HINT: The higher the charge Voltage then the higher the cost of the solar generator. An example of a high input Voltage For example the 1500WH Bluetti Maxoak can handle a max input charge Voltage of 68VDC. It costs $799. If you go with a two way dual 500W generator it can hit a peak of 100V DC so you would need something like the Bluetti AC200 Max that can handle a max input charge Voltage of 145V DC. This costs $1,899
  • OPTION 2 – Use a much less expensive solar generator along with an over Voltage protection module.

This will open up the connection between the bike generator and the solar generator power station whenever you start to pedal too fast and exceed the max Voltage of your solar generator.  For example I purchased the  FlashFish 200W for $129.00.  It has a lot of power for such a small size.   It takes a max input charge DC Votlage of 24V.    To protect it from being damaged by the bike generator I installed an NC25A-12V  unit which opens up the relay connection at about 16V DC  When pedaling at 50V DC Output on the bike generator.  The reason why the NC25A is so special is that handles a max input Voltage of  140V DC  so that when it opens up to protet your solar generator  it does not get destroyed by a huge Voltage spike.   This means the Voltage going into the FlashFish  will never go over 16V DC.  

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