How-to · Step-by-step
How do solar panels work?
Solar panels turn sunlight directly into electricity using the photovoltaic effect, in which light striking a semiconductor such as silicon knocks electrons loose to create a current.
The step most authors miss
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Step by step
How to do it
1.Sunlight reaches the solar cell
Light from the Sun arrives as tiny packets of energy called photons. The solar panel is positioned to catch as much sunlight as possible on its photovoltaic cells.
2.Photons knock electrons loose
When a photon strikes the silicon, it can transfer its energy to an electron, freeing that electron from its atom. Brighter, stronger sunlight frees more electrons and produces more electricity.
3.A built-in electric field directs the electrons
The cell is made of two silicon layers that create an internal electric field where they meet. This field pushes the freed electrons consistently in one direction rather than letting them drift randomly.
4.A direct current flows
The directed movement of electrons through the cell and out along attached wires is an electric current — specifically direct current (DC), flowing one way.
5.An inverter converts the current
Homes and the grid use alternating current (AC), so the panel’s DC output passes through a device called an inverter, which converts it into AC electricity usable by appliances.
6.Electricity is used, stored or exported
The electricity then powers your home, charges a battery for later, or is fed back into the grid. Output rises and falls with how much sunlight the panels receive.
Sunlight into electricity, directly
A solar panel converts the energy of sunlight straight into electricity, with no moving parts and no burning of fuel. Each panel is built from many photovoltaic cells, usually made of silicon, a semiconductor. The silicon is deliberately treated, or “doped”, to create two layers with opposite electrical character, and where they meet a built-in electric field forms. This field is the key: it gives any electrons freed by sunlight a definite direction to flow, turning random light energy into an orderly electric current. The process is called the photovoltaic effect.
Common questions
FAQ
Do solar panels work on cloudy days?+
Yes, but less efficiently. Solar panels respond to daylight, not just direct sun, so they still generate electricity under clouds — typically a fraction of their full output, depending on cloud thickness. They do not work at night, because they need light, which is why batteries or the grid cover those periods.
What is the photovoltaic effect?+
The photovoltaic effect is the process by which certain materials produce an electric voltage and current when exposed to light. In a solar cell, photons of light knock electrons free in a semiconductor, and a built-in electric field drives those electrons in one direction, generating electricity directly from light without any moving parts.
Why do solar panels produce direct current?+
The photovoltaic effect pushes freed electrons consistently in one direction through the cell, which by definition is direct current (DC). Household appliances and the electricity grid run on alternating current (AC), so an inverter converts the panels’ DC into AC before it is used or exported.
Going deeper
