and when I'm using pedal power I have a built in charge controller,myself.
.......I keep an eye on the voltage of the voltmeter ...when the batteries reach a certain level I just switch batteries.
....Or quit! Usually the latter...LOL!
I charge 4-6 volt Ni-Cad 'sticks' in parallel at a time, very good exercise, not that I would ever think of quitting the exercise....but when my power consuming projects get going....would be nice to have some solar and wind help. How's the wind and sun over there today? ( :>) Norm