How the photovoltaic effect works
Solar panels contain photovoltaic cells made of silicon. When sunlight hits the silicon, it gives energy to electrons in the atoms. These electrons get knocked loose and start moving, creating an electric current. This process is called the photovoltaic effect. It happens instantly whenever sunlight shines on the panel, without any moving parts or fuel needed.
The role of semiconductor layers
Each solar cell is made of two layers of silicon with different properties. The top layer has extra electrons, and the bottom layer has missing electrons called holes. When sunlight knocks electrons loose, they naturally want to move toward the layer with holes. This creates a flow of electrons in one direction, which is what we call electric current.
Converting DC to usable electricity
Solar panels produce direct current, or DC electricity, the same type a battery makes. However, most homes use alternating current, or AC electricity. An inverter is a device that converts the DC electricity from solar panels into AC electricity that can power your home and connect to the electrical grid.
Weather and efficiency factors
Solar panels work even on cloudy days because they respond to light, not just direct heat. However, they produce less electricity in clouds or shade because less light reaches them. Modern solar panels typically convert 15 to 22 percent of the sunlight that hits them into usable electricity, with the rest lost as heat.
Panel lifespan and durability
Solar panels have no moving parts, so they require very little maintenance. Most panels last 25 to 30 years or longer and slowly lose efficiency over time at a rate of less than 1 percent per year. They can withstand rain, wind, and snow, making them a durable long-term energy solution. 
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