Hi.. i'm having a problem in understanding the processes related to my bicycle generator.. will be awesome if you guys can help me out ^_^ i am kind of confused.
My project is about green energy.. and im trying to fabricate a bicycle generator that charges a lead acid battery rating of 12V 70Ah 840Wh with a permanent magnet motor of 24v 250w output at 2850RPM, so in order to create a voltage constantly higher than 12V the motor must rotate at a speed of at least 1425 RPM.
The watt rating of the motor 250w is divided by 24volt to get the maximum current possible of 10.4 amps. Is this correct?
Can i use an AC motor such as used fan with a rating of 250V 75W 50Hz.
75W / 250V = 0.3 amps but how do you get the rpm? The only rating i saw given for permanent magnet dc motor is voltage and amps, do they usually give out rpm rating too? becase i'm thinking of getting a used car alternator as my bike generator.. whats the normal rating for alternator?
Coming back to my lead acid battery.
theoretically it will have a rating of 12V 70Ah 840Wh at 60% state of charge (around 12.2v base on internet)
let say i manage to churn out 150 watt on my generator
how do i count the time it will take to get it full charge?
i just need a rough estimation and i cant seem to comprehend this hehe
hope you guys can help out
Thanks a bunch!
This is my university project and by the end of it i hope that i can producea bicycle generator producing 100w powering a laptop of 80W and charging a lead acid battery. I havent got the stuff yet just trying to understand the calculations and circuit first.. any suggestion on the circuit is appreciated.
P.s i know theres another thread about bicycle generator but its already old i cant reply to it
My project is about green energy.. and im trying to fabricate a bicycle generator that charges a lead acid battery rating of 12V 70Ah 840Wh with a permanent magnet motor of 24v 250w output at 2850RPM, so in order to create a voltage constantly higher than 12V the motor must rotate at a speed of at least 1425 RPM.
The watt rating of the motor 250w is divided by 24volt to get the maximum current possible of 10.4 amps. Is this correct?
Can i use an AC motor such as used fan with a rating of 250V 75W 50Hz.
75W / 250V = 0.3 amps but how do you get the rpm? The only rating i saw given for permanent magnet dc motor is voltage and amps, do they usually give out rpm rating too? becase i'm thinking of getting a used car alternator as my bike generator.. whats the normal rating for alternator?
Coming back to my lead acid battery.
theoretically it will have a rating of 12V 70Ah 840Wh at 60% state of charge (around 12.2v base on internet)
let say i manage to churn out 150 watt on my generator
how do i count the time it will take to get it full charge?
i just need a rough estimation and i cant seem to comprehend this hehe
hope you guys can help out
Thanks a bunch!
This is my university project and by the end of it i hope that i can producea bicycle generator producing 100w powering a laptop of 80W and charging a lead acid battery. I havent got the stuff yet just trying to understand the calculations and circuit first.. any suggestion on the circuit is appreciated.
P.s i know theres another thread about bicycle generator but its already old i cant reply to it