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Circuits designed by David Johnson, P.E.
Last Updated on: Wednesday, October 18, 2017 05:04 AM

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More  Solar Circuits

Solar Path Light Improvements Circuit
designed by David Johnson, P.E.
March 13, 2011

Use the circuit below was designed to replace the guts of an existing path light assembly with one which has a much better performance.  I suggest using a quality 10 cell solar panel with at least a 4 square inch area. Buy a panel with solar panels that fills nearly the whole panel area with solar cells.

The circuit uses an ideal diode and voltage regulator to charge either a lithium ion or a 3 cell NiMH battery.  The circuit drives a quality LED with 20ma of constant current and measures the voltage across the solar panel to know when to turn off the LED during daylight hours.  I strongly recommend using a quality white LED from Cree or some other reputable source.

5v 100ma Solar Panel

 

Text & Graphics Copyright of David A. Johnson, PEAll rights reserved, NO EXCEPTIONS!

Solar Path Light Improvementsdesigned by David A. Johnson

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