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Portable Solar Lantern circuit

2017-08-03 10:23  
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 This article describes the Portable Solar Lantern circuit. The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: 1N4004.

This portable solar lantern circuit uses 6 volt/5 watt solar panels are now widely available. With the help of such a photo-voltaic panel we can construct an economical, simple but efficient and truly portable solar lantern unit. Next important component required is a high power (1watt) whiteLEDmodule.

When solar panel is well exposed to sunlight, about 9 volt dc available from the panel can be used to recharge a 4.8 volt /600 mAh rated Ni-Cd batterypack. Here redLED(D2) functions as a charging process indicator with the help of resistor R1. Resistor R2 regulates the charging current flow to near 150mA.

Solar Lantern Circuit Schematic

Figure:1

Figure 1 

Assuming a 4-5 hour sunlit day, the solar panel (150mA current set by the charge controller resistor R2) will pump about 600 – 750 mAh into the battery pack. When power switch S1 is turned on, dc supply from the Ni-Cd battery pack is extended to the whiteLED(D3). Resistor R3 determines theLEDcurrent. Capacitor C1 works as a buffer.

*Note: *
After construction, slightly change the values of R1,R2 and R3 up/down by trial&error; method, if necessary.

 

 


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