Question: In Dhaka city during the month of May, a 20W rated solar panel supplies 15W of power at an output voltage of 15V & an output current of 1A. But during the month of December, the same solar panel supplies 8.5W of power at an output voltage of 10.5V & an output current of 0.81A. The solar panel is used to charge a 12V battery. Practically, for charging a 12V battery we need to supply 13V. i) In the month of May, the user will need a DC-DC converter (Buck) to charge the battery. a) What will be the duty cycle? b) Assuming that the converter is 100% efficient, what will be the input current to the battery?

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Solar Cell

A solar cell, or photovoltaic cell, is a device that converts light into electricity directly through a photovoltaic effect, i.e., a physical and chemical event. It is a type of electromagnetic cell, defined as being used for its electrical properties, current, voltage, or resistance, which vary when exposed to light. Everyday cellular gadgets are usually the building blocks of photovoltaic modules, collectively known as solar panels. Single junction silicon solar cell can generate an open circuit of about 0.5 to 0.6 volts.