How Solar Panels Can Generate Electricity

Solar panels generate electricity when sunlight (photons) hits semiconductor cells and produces a flow of electrons through a process called the photovoltaic effect. 

How it works — step by step
Photons strike the panel’s surface and enter the semiconductor layers of each solar cell. 
Each cell is made from a semiconductor (usually silicon) with a built-in electric field at a p–n junction; when photons free electrons, that field pushes the electrons in one direction, creating a current. 
Metal contacts on the cell collect the moving electrons and route them as direct current (DC) through wiring. 

An inverter converts the DC into alternating current (AC) so it can run household appliances or be fed into the grid. 
In a typical rooftop system, electricity either powers the home immediately, charges batteries for later use, or — if there’s excess — is exported to the grid (often via net metering). 

Key components and their roles
Solar cells: generate electrical current from photons by the photovoltaic effect. 
Glass/encapsulation and anti-reflective coatings: protect cells and let more light in, improving efficiency. 

Metal contacts and busbars: collect and conduct electrons out of each cell. 
Inverter: converts DC to usable AC and manages synchronization with the grid. 
Mounting, wiring, combiner boxes, and a meter: complete the system and route power safely. 

Real-world behavior and notes
Output varies with sunlight intensity, angle, temperature, shading, and panel efficiency; panels still produce some power on cloudy days but far less than in bright sun. 
Multiple cells form a panel; multiple panels wired together form an array, so larger arrays produce more energy. 

Modern systems often include monitoring so owners can see production in real time and spot problems. 

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