Originally Posted by
unterhausen
I am pretty sure the output of a dyno is DC, in the sense that the output voltage doesn't cross ground. Dynos are DC generators. The fact that the output looks a lot like a sine wave and you can treat it like AC notwithstanding.
Not sure what a ground has to do with it. There are two wires out of a dynohub. On Shimano hubs, one wire is grounded to the fork and on SP hubs neither wire is grounded to the fork, I have not used an SON so I do not know about that one and I have never seen a Sanyo. All three hubs operate the same way, AC current to the two wires.
If you tried to charge a battery directly from hub output, it is not going to work unless you use a rectifier. If you include a rectifier to convert AC to DC, you could actually charge a battery with the hub output.
I actually built up a four cell NiMH AA battery charger that works from hub output, but I only built it for emergency use if my other charging gizmos failed, it had no auto shut off and all four batteries of the same brand and model would have to start at a nearly identical state of discharge to charge properly. Thus it was not an ideal way to charge batteries but I thought for emergency backup since it weighed almost nothing, it would work. I included a small volt meter on it so I could see charging progress.
Originally Posted by
noglider
Boy, can we add more misinformation? Let's try harder.
I can't think of anything ...