I want a simple way to keep a 12 volt gel cell charged between a range of voltages (approx 10.5 volts and 13.8 volts), and to disconnect the load when it falls below 10.5 volts, and reconnect at 13.8 volts. I am using an 18 volt solar cell as the power source, and this has an amplified zener to regulate its voltage to a fairly stable 13.8 volts, but it can fall below this when dark!
I have looked at a window comparator circuit, but it needs a stable supply voltage. Any ideas? Thanks
I have looked at a window comparator circuit, but it needs a stable supply voltage. Any ideas? Thanks