Source : http://www.talkingelectronics.com/projects/200TrCcts/200TrCcts.html
The pot is adjusted so the relay drops-out at 13.7v
The charger will turn ON when the voltage drops to about 12.5v.
The 100R Dummy LOAD will absorb 3.25 watts and that is the
maximum wattage the panel will produce with 100R load.
I've added two switches to discharge the hold capacitor and the "battery". These are for testing purposes only.
