Run a fan with the energy of a river

[TomTom]

If you need 12 volts, no need to try to put the dynamos in series: it is not continuous.

I had however read on the net that the dynamo of bicycle provided continuous kind 0.5A 6V ... the truth is it elsewhere? (lol)

Assume that the dynamo does provide a direct current, it is possible to recharge a battery? and how to estimate the charging time? it would be necessary to use 2 dynamo (therefore 2 paddle wheels) in parallel to obtain 12V? otherwise it can be 6V batteries?

Power level, we only get 3W with the dynamo ... to operate a fan it is rather around 50W so a priori it's dead ... that would pose a problem for a battery?

There is no way to get a diode bridge here ... or else I have to learn to say Graetz bridge in Vietnamese I think it's a little hot to straighten out the current.

Suddenly the history of Canadian well seems very interesting to me ... the problem is that it is only the 2nd time that I hear this word ...
I do a little tour on the net, and I come back afterwards with lots of questions

And thank you for your answers !

[Christophe]

No, bike dynamos (with some exceptions) are the alternative, you can easily see it by the flickering at low speed ...

But you can easily obtain continuous following this plan: https://www.econologie.com/forums/dynamo-de- ... t7821.html
(for example)

If you use a buffer battery, the power of the generator may be lower than that of use, it will depend on the number of hours of operation over 24 hours.

The formula which gives you the power P of the necessary gen is as follows (any losses neglected):

P = h * p / 24

With p = power use
h = average duration of use over 24 hours

Examples:
Your 50W fan only runs 8 hours a day.
So you need a power of

P = 8 * 50/24 = 16.7 W

Put a coef. of approximately 0.8-0.9 for the "load losses" and you thus obtain a necessary power of approximately 21 W.

[bain2jasmin]

it's interesting but the slum kid would like to eat and drink before turning on a fan, right?