The power bank can also be charged by an external 5V source. Then the battery is used to supply a stable 5V which is used by USB gadgets. The energy gained by the solar panel is stored in a LiPo battery. In this project, we are building a power bank which harvests energy by using a solar panel. As the electrons flow through the cell, they generate electricity. When sunlight hits the cells, it knocks electrons loose from their atoms. The cells are made of semiconductor materials like those found in computer chips. Many people are familiar with so-called photovoltaic cells, or solar panels, found on things like spacecraft, rooftops, and handheld calculators. It is considered as a serious source of energy for many years because of the vast amounts of energy that is made freely available, if harnessed by modern technology. Solar energy is renewable, free, widely available and clean form of energy.
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