Low Current Dump Circuit
I know solar regulators are cheap, but I have been experimenting for fun. I have a 40 Watt Solar panel and a 12v battery for my dinghy to operate a light and a radio for emergencies. I created a low current dump circuit, that triggers only when voltage trigger has been met (set by Zener plus .6v to activate PNP Transistor). Based on 18v max voltage, divided by 680 Ohms, and multiply a gain of 75 for TIP42C PNP Transistor, the circuit will dump about 2 Amps, until battery voltage drops below trigger voltage. The Transistor forms a short and dumps the battery. At 2 Amps, the Transistor is within the 6 Amp limit of the Transistor.
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