Based on Michael Davis’s circuit, vina1991 built an automatic solar charge controller for a 12V battery using the 555 timer IC. It is a switching circuit controls the connections between the solar panels output and battery terminals. You can set the upper and lower thresholds for battery voltage so that the charger can automatically switch back and forth between charging and cut-off mode. When the battery terminal voltage goes below the lower limit, the charging process begins, which stops automatically when the battery voltage reaches the upper limit. The switching is performed using a relay switch.
555 Timer based automatic solar charge controller
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