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Analog Shunt-mode 12V 500mA Solar Charge Controller

2015-03-02 03:59  
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Analog Shunt-mode 12V 500mA Solar Charge Controller
This circuit is an analog alternative to the switching Shunt-mode Solar/Wind Charge Controller. It is one of the simplest ways to regulate the solar charging of a rechargeable battery, using about a dozen parts. Despite its simplicity, the circuit is relatively efficient. Unlike the all-or-nothing switching shunt-mode controller, this circuit gradually diverts solar power from the battery to the dump load resistor as the battery reaches the preset battery float voltage. As shown, the circuit is limited to 500mA of solar charging current. Higher power systems will be better served with a series switching charge controller. The circuit shown is set up to charge a 12V battery, it can be modified to support both lower and higher voltage battery systems by changing the value of the 39K resistor.