Friday, 15 January 2016

6V Solar battery charger circuit using LM317

Today we are going to learn how to make a simple solar battery charger for 6V battery.

The solar charger we are going to make is based on LM317 regulator IC. When battery has reached is full charge voltage (Battery voltage is higher than VDz + 0.7v), our charger circuit automatically cuts the charging to protect the battery form damage. The LED light will indicate the full charge state in the battery.

Our charger circuit will work only when the voltage level from the solar panel is much higher than the battery voltage, unlike the solar charger with regulator and controller that can charge regardless the solar voltage.

Part List:-

Solar - 12V solar cells array

C1 - 470uF electrolytic capacitor rated 25V

D1, D2 - 1N5400 or any rectifier diode rated 2A minimum

Dz - 1N5235B or any 6.8V zener diode

R1 - 3 kilo ohms 1/4Watt

R2 - 330 ohms 1/4Watt

R3 - 560 ohms 1/4Watt

R4 - 2 kilo ohms 1/4Watt

LED -3mm or 5mm Red or any low power LED

Q1 - 2N2222, CS9013, or similar NPN transistor

Bat - 6V lead acid battery

Make the above simple circuit to charge your 6V battery from clean and environment friendly energy.

If any query arises pleas ask them in the comment section, i will be happy to answer.

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