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

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

Click on Drawing Below to view PDF version of Schematic

Improved Path Light circuitdesigned by David Johnson, P.E.

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