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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, November 20, 2017 05:52 AM

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More  Solar Cell Circuits, Cell Phones, Battery Chargers

Solar Powered Cell Phone Charger

The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas Instruments. The tiny device can handle up to 400ma of charging current.  I would suggest using a solar panel rated for less than 2 watts and one which contains 12 solar cells.  One such panel is shown below.
6v 170ms Solar Panel
6v 170ma Solar Panel

Click on Drawing Below to view PDF version of Schematic

6 volt solar panel circuit designed by David A. Johnson, P.E.



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