how can i store or save the electric(from bike generator) to a battery or charger?
January 17, 2011 by pbik
Filed under Electric bike
sory, i cant speak english well…
how can i store or save the electric(from bike generator) to a battery or charger?
in solar power, it has solar charger controller, batteries and so on… so im using this concept in bike generator, so how can i store the electric to (something like) charger or batery?
first of all you have to find the voltage coming from the gen,
a bike gen should put out around 1.5 volts so you will need Rechargeable batteries that will take 1.5 volts .
you can charge them Direct from the generator
A human-powered bicycle generator is not very difficult to hook to a battery if you don’t mind how large the battery is. You want the battery to be able to absorb many more watts than the generator can produce. You want the battery voltage to be a few volts less than the generator produces when it is disconnected from the battery and being pedaled and measured at the 2 wires ( open circuit voltage output). For a typical bike generator, this voltage is usually 6 volts. If you use some other generator like a car alternator hooked to the bike, it may be more like 14 volts. Good choices for inexpensive batteries that are big enough would be a car or a motorcycle battery of either 6 volts for a bicycle generator or 12 volts for the larger alternator. Solar panels have a fancy charger circuit in front of their batteries because they are concerned about overcharging and burning up the batteries if you keep them charging in the sun for too many hours. With a bicycle, you will stop long before then because you will become tired. You could have a simple light come on to tell you to stop pedaling when the battery voltage got too high and the battery was full. A simple LED light circuit hooked between the positive and negative battery terminals will work. A red LED with a 7 volt Zener diode or a 14 volt Zener diode for the larger battery could be used as your full charge indicator. The light would come on when the battery voltage became higher than the Zener diode voltage. Make sure to put a resistor in line with the LED so the light does not run too bright, 100 Ohms is a good choice.