solar cell power supply

Solar Cell Power Supply System Circuit Diagram

The simplest solar cell power supply system consists of three parts; a diode, a solar cell panel and a rechargeable battery. The diode prevents the battery being discharged through the solar panel when no or little light fall on to the panel. Although the diode is a type of Schottky type, the forward drop of this type may cause an appreciable loss of energy. The present circuit uses a special low drop diode.

How the solar cell power supply system works?

The opamp draws only a tiny current on average 20µA. Although it can operate at allow voltage of as low as 1.6 V. The gate of T1 requires at least 3.0 V to be switched on. For that reason the nominal battery voltage is specified as 4.0 V.
To align the circuit, replace the solar panel by a variable regulated power supply with its current limiting set to value that is safe for the battery. Set the power supply output to a level that is 0.1 V higher than the current battery voltage. Next, adjust P1 so that the output of IC-1 just becomes logic high. Finally, check with an ammeter that the battery is not being discharged when the power supply is set to below the current battery voltage.

Solar Cell Power Supply System Circuit Diagram:

solar cell power supply

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