Electronics > Beginners
Free Energy Hand Crank Generators -- 2.4A/5V Possible?
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Undweeber:
I've looked into hand-crank generators, and most that are sold seem to be complete trash, having plastic gears, horrible gear ratios (marathon spinning), cheapest DC motors.
They are usually only able to power old android phones at best and are most suitable for cellphones of the previous decade.

One hand crank that does stand out is the one that produces 120V ("pocket socket"), it appears to also be decent handheld size and not a child hand size, the issue is too much power conversion DC-AC-DC, or worse AC-DC-AC-DC, while it seems to be sufficient to power 1A requiring devices, I have not seen it being used with 2.4A bricks, and whether it can produce enough power, the manufacturer does not seem to list the wattage its capable of, so its probably bad.

Third option is Chinese handhelds designed "for military" that are super cheap on alibaba in bulk, but become 3X more expensive on aliexpress/amazon, $170 for 30W one, made of metal, but the specs while promixe 3A max, say that nominal is 1.5-2A, probably meaning that you have to spin it super fast, meaning gearing sucks (low torque).


Any suggestions? Is there a high torque gearing that provides nominal ~30W that would be capable of 2.4A 5V quick charging?
soldar:
For how long do you think you can generate 50 W by hand cranking?  If you are seriously thinking of generating that order of magnitude I think you need to go with foot pedals and be fit. If you are not fit you soon will be.
james_s:
I remember using stationary bicycles that measure your effort in Watts, seems like I found I can produce about 100W for a reasonable amount of time but that's a good steady workout. I think 30W with a hand crank would be a very brisk sprint. Unless you've got the upper body of He-Man you're not gonna be able to sustain that for more than a few seconds.
Monkeh:
Since when is food free?
IanB:
I haven't looked, but I guess there might be exercise bikes that use a generator as a load instead of friction or whatever they use normally. You could then logically charge your phone while you work out. Or at least charge an accumulator that later charges your phone. But electricity is so cheap there wouldn't be any real point. I would guess food is a much more expensive source of energy than the electric socket in your house.
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