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Bike Generator Car Alternator Specifications

| Step 1 |  | Step 2 |   | Step 3 | |Step 4 |  |Step 5 | |Step 6 | |Step 7 | |Step 8 | |Step 9  | |Step 10  | |Step 11 | |Step 12 | |Step 13|  | Specifications |   | Test Results |


These Free DIY BYO Plans are now being replaced by these plans which involve less steps.



Typical Applications This bike generator can deliver regulated DC voltage to low power items such as:
  • Ipod (through 12V cigarette Lighter adapter)
  • Portable DVD Player
  • Power a 7 Watt  5 inch black and white  TV
  • Charge cell phones  (All Types) using cigarette lighter style plug.  Some one in their mid teens or higher can charge  5 or 6 phones at once.
  • Charge a car battery through a 5 Ohm power resistor.  If you don't use the resistor it is too hard to pedal. 
  • Supply power to Playstation 2  (PS2) Video Game
  • DC Fan
Generator Start Up Speed

23 Miles per hour ( 300 Rear Tire RPM)

Once you mount the bike and pedal fast to hit the startup speed of 300 RPM,  the generator will kick in.  After that you can slow down and pedal at half that speed.  RPM stands for revolutions per minute.

Regulated DC Voltage Output

  14.8 volts Direct Current (DC)

This is the same voltage that U.S. cars run at.   After traveling through your car's electrical harness out to your cigarette lighter, the 14.8 Volts  droops down a bit to around the 14.0 Volts DC.  So all of the time you've been thinking that a car runs at 12 Volts right? It doesn't.  The only time it is at 12 Volts is when your engine is off and your are measuring voltage from your battery. 

Max DC Current

20 Amps  (4 Amps realistically possible)

Even though the wiring for this project can handle 20 Amps, you will find it extremely hard to pedal when it is putting out more than 4 Amps.  This is because the the alternator is innefficient. 

This design uses a 68 Amp Car Alternator .  But the 12 Gauge wiring size used is only good for 20 Amps.  If this bike is hooked up to something that draws  20 Amps of current, you'll be putting out 296 Watts.  At that rate you'd  be wiped out after 60 seconds of pedaling.

If you want to go gonzo and use all 68 Amps, then use 4 strands of wire in place of 1 and buy fuses rated for 68 Amps.

Max Power

296 Watts Max (40 Watts Realistically)

This bike generator will be able to supply power to low Wattage items such as cell phones, Playstation 2,  and small DVD players or TVs.  Anything over 40 Watts will be Too hard to pedal. 

Formula for calculating Max Watts is:   Volts X Max Current = Max  Watts.  So in this case we have 14.8V X 20 Amps = 296 Watts

Regulated AC Voltage Output

110 Volts Alternating Current (AC)

If you decide to implement an  AC inverter  into your design, then it will provide you with AC power needed to power low wattage items like:


50 Pounds

Assembly Time

About a day

Bike Compatibility

Road bike or Mountain bike with "Quick Release" axle

The Ascent bike stand is supposed to work with a road bike or mountain bike that has the quick release  lever.  You know the kind that doesn't require you to use a wrench to remove your bike tires.  You can get it to work with a regular bike axle that has nuts on each end, but the risk is that the stand may release the bike when you are riding it and cause personal injury.