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Circuit Solar Powered Lithium Ion Battery Charger
designed by David A. Johnson, P.E.
May 15, 2007 

The circuit below feeds a controlled current and voltage to a 3.6v lithium ion battery. The current is limited to 300ma and the voltage is limited to 4.2 volts. The circuit uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit and a 6 volt solar panel.
The circuit below feeds a controlled current and voltage to a 3.6v lithium ion battery. The current is limited to 300ma and the voltage is limited to 4.2 volts. The circuit uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit and a 6 volt solar panel. Some very nice 6 volt solar panels are available from http://www.plastecs.com Their SP6-200-12 cranks out about 1 watt while the SP6-300-12 can produce about 2 watts. Assuming a 6 hour sunlit day, the 2 watt panel will pump about 1.8 Amp-hours into a battery.


www.plastecs.com SP6-200-12

Click on Drawing Below to view PDF version of Schematic

Circuit Circuit Solar Powered Lithium Ion Battery Charger designed by David Johnson

 

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