Originally Posted by
andy_p
I'm thinking about charging a battery or USB device, not lighting. In this case, the wide range of wheel rpm means you won't get full charging capacity (eg, USB requires 5W) until you are moving fairly quickly.
....
What are you charging that requires a full 5 watts continuously?
Originally Posted by
znomit
For charging stuff the best thing to do is use a cache battery with pass through charging (so you can charge the battery while the battery is charging your device). That smoothes out the power peaks and troughs. You want a dynamo that will supply the most power over the day.
Agree.