| Disclaimer:The following are my notes. As I am learning electronics, I am making my notes available. I hope they will be of benefit. However, I do not guarantee the accuracy of my work. I recommend the reader exercise critical thinking.
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Schematic 2
Version 2
My second version builds on the previous version.
A few additional items are necessary. I added
a diode and capacitor just before the regulator.
This will retain some reserve power just for the regulator.
Schematic
Here is the new schematic. Due to lack of sunlight, I've tested this only a little. It does switch on when the input voltage is greater than 9.6 volts.
For a 12 volt lead-acid battery the reference voltage for the voltage
comparator should be set at around 4.75 with the variable resistor.
This corresponds to a 14.25 volt charge.
When the input voltage is around 9.8 volts, the system will cycle between
off and on. This previous design would behave unpredictably while in this
state. This new design will function properly, but will only function
for a couple of seconds.
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