Solar battery charging circuit
Today we will learn about a circuit for charging Lead Acid and Ni-Cd batteries via solar energy, and it is a very simple circuit based on a 12V solar panel with the most famous variable voltage regulator lm317 and some simple electronic components that we will get to know. As previously mentioned, this circuit is suitable for charging a group of types of batteries of the 3,7 volt, 6 volt, and 9 volt categories, and it produces good current, but depends on the capacity of the solar panel itself.
The circuit relies on an adjustable LM317 voltage regulator with a solar panel that outputs 12V volts. When the solar panel is placed in the sun, an electric current is generated as it passes through diode d1, and the benefit of this diode is not to allow the current to return to the solar panel and damage it. Then it passes directly to the voltage regulator lm317 so that the variable resistance VR works between the Adj and Ground terminal of the regulator to obtain a voltage of 9V at the output,
and the charging current of the batteries is determined by adjusting the resistor R3, which is often of a small value, but its capacity must be At least 1W watts. The benefit of the diode D2 is to prevent the current from returning to the circuit and thus damaging it, and the transistor with the zener diode performs the separation process when the batteries are fully charged.
Lead Acid and Ni-Cd battery charging circuit using solar energy:
Components of the battery charging circuit by solar energy:
voltage regulator lm317.
Solar panel 12V volt pano solar.
Diode: 1N0007.
Zener diode: 6,8v |1W.
Rectifiers: 1KΩ, 180Ω, 10Ω.
Variable resistance: 1KΩ.
Lead Acid Battery, Ni-Cd.
important note :
This circuit is set to charge batteries with a voltage of 6 volts, and if you want to charge batteries with different voltages, you have to change the voltage of the zener diode, for example, to charge a 12 volt battery, you have to use a zener diode, so that Vz = 14.2V, and for a 9 volt battery, you have to use a zener diode, Vz = 9,8V and so on, so that Vz depends on the full charge voltage of the battery to be charged.
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