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¿What power source is more efficient? Answered

For a project I have to decide between a mechanical generator (I.E. one attached to a bike's wheel) o an array of cheap solar panels.

Anyone has experience with this? What is your advice?

I only need to supply power to recharge four generic AA batteries once a day.



Batteries can only be charged at a given rate. So, if 2 hrs is the minimum time to charge em, you'll b pedaling 2 hrs.

But. If u use bike 20 min per day, to charge a big battery, then that battery can trickle charge the little batteries any time.

my 16 solar panel can generate 4kw a normal person can develop about 360 watts

Depends on who you want to do the work ;-) A BLDC motor attached to a wheel would be a very efficient generator.