Solar charged lead acid battery, how do I have automatic shut off and turn on so it does not discharge completely?
I have a battery with a charge controller between it and the solar panel. But if I connect something low power to it, (like an aquarium air pump for a windowfarm or to power a small water feature), it needs to shut off automatically before the battery discharges too much (if it is night time or cloudy). Otherwise I have a dead battery. I don't have a deep cycle battery. Too expensive! So any ideas how to have an automatic on off switch for this? Thanks, Brian.