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Solar panel switch

Based on a Labs project | October 2011 | Find it here
Solar panel switch
When a battery is charged by a solar panel during the day, it may discharge via that panel after sunset. This may, of course, be prevented by a diode, but that has the drawback of a forward voltage drop of 0.7 V or, in the case of a Schottky diode, 0.4 V. In many applications. this is not acceptable.
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