Solar powered battery charger circuit

solar-powered-battery-charger-circuit-diagram
Solar Powered Battery Charger Circuit

Solar power is one of the free form of renewable energy that our planet earth is blessed with. Increase in energy demands forced to seek ways for extracting power from renewable sources and solar seems to be a promising source. The above circuit will demonstrate how to build a multipurpose battery charger circuit by means of a simple solar panel.

 WORKING OF SOLAR POWERED BATTERY CHARGER CIRCUIT:

This circuit derives power from a 12V, 5Watt solar panel which converts the incident light energy to electrical energy. A diode 1N4001 was added to prevent the reverse flow of current which could result in damage of the solar panel.

A led was added with current limiting resistor R1 to indicate the flow of current. Then comes the easy part of the circuit, voltage regulators was added to regulate the voltage and to obtain desired voltage levels. IC 7805 gives 5V as output whereas IC 7812 gives 12 voltage as output.

ic-7805-voltage-regulator-pin-diagram
IC 7805 Pin diagram

Resistors R2 and R3 are used to restrict the charging current to a safer level. You can charge NiMh, Lithium ion batteries using the above circuit.  You can also use additional voltage regulators IC along with it to obtain different output voltage levels.

 
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Frank Donald

Frank Donald

Junior Network Engineer at Tata Communications
Frank Donald is an Electronics and Communication Engineer who loves building stuff in his free time. Video games, blogging and programming are the things he loves most

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Burak
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Burak

1) At least 14V solar panel needed in order to get 12Vout from 7812. So 12V solar panel is useless.
2) You can’t charge(or you shouldn’t charge) a lithium ion battery. With 7805.
3) You should calculate the power dissipation on resistors so people can take their components by considering them.
Thanks.

Bella
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Bella

Can you elaborate on 1 and 2

ali
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ali

nice
when we remove resister what will doo