Investigation of Rechargeable LED Lamp Circuitry Using Solar Power

In recent years, the demand for renewable energy has increased considerably as electricity generation from renewable resources continues to increase. In this study, we worked to improve the design of a small rechargeable lamp containing a simple circuit consisting of three LED lights in parallel, powered by three 1.2V nickel metal hydride batteries and a 5V solar panel. Three different boards were utilized in the experiments: a charging board, a constant voltage board, and a step-up DC booster constant current converter board. Both series and parallel circuits were compared as well as a resistor and diode to determine the most efficient circuit. This light source that was constructed of low-cost, easily accessible materials that can be used in underdeveloped or low-income areas of the world was investigated to improve the efficiency and lifespan of the circuit. It was determined that the most efficient circuit in terms of efficiency and cost was the original circuit consisting of three LED lights in parallel using a diode.