I'm trying to design a solar power battery charger that won't overcharge batteries. I've worked out how to make a basic solar charger (solar panel, blocking diode, voltage regular, battery), but I can't figure out how to prevent the batteries from overcharging if I leave them out. I was thinking that an NPN transistor might be useful as a switch, but I don't know where to start.
Does anyone know how to protect batteries from overcharging in a solar power charger?
Does anyone know how to protect batteries from overcharging in a solar power charger?