johan07 wrote:So if I understand correctly, it is the load (the fans for my case) which defines the intensity. The more the load needs power, the more it will demand intensity from my generator while influencing the voltage. The intensity will be limited by my modules which have a limit not to be exceeded.
If this is not what you wanted to explain to me, I apologize but my knowledge of electric vocabulary is poor.
Basically, that's it, but it's a little more complicated.
The intensity is not "asked", it is established according to the characteristics of the generator and the load.
But the voltage also depends on the intensity supplied.
What makes that one is generally interested in finding the point of operation for which the load receives the maximum of electric power while playing on the only thing at our disposal: the resistance of the load.
If you want to test, I advise you to use resistors (bulbs, ...) rather as a load rather than motors whose impedance varies according to the speed of rotation (it becomes one more variable to calculate the point of equilibrium).
It turns out (it shows) that the load receives the maximum electrical power when its resistance is equal to that of the generator.
The internal resistance of one of the modules you use seems to vary between 2,8 and 3 ohms depending on the temperature.
For 8 modules in series, you will therefore obtain the maximum output power by placing a resistance of 22 to 24 ohms (i.e. a bulb of 6W / 12V approximately): you should then observe an intensity of 0,6A and a voltage of 14,5, 8V, or a power of about XNUMXW.