Science and Technology
The idea seems improbable at first glance: using Common LEDs as small solar cellsHowever, from a physical standpoint, the concept is real. An LED (Light Emitting Diode) is a semiconductor device that emits light when it receives an electric current, but the process can also work in reverse: when exposed to light, it can generate a small difference in electrical potential.
The experiment presented in the video is based precisely on this principle. Instead of using traditional silicon photovoltaic cells, the project uses high-brightness red LEDs, connected in series and parallel, forming a handcrafted panel capable of generating approximately 6 volts under direct sunlight.
An LED is basically a semiconductor diode. Like solar cells, it has a PN junction. When light falls on this junction, photons can excite electrons, creating a small electric current. This phenomenon is known as… photovoltaic effect, the same physical principle that governs conventional solar panels.
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However, LEDs are not designed to maximize light capture, but rather light emission. Therefore, their efficiency as generators is significantly lower than that of commercial solar cells.
In the experiment, the first test consists of measuring the voltage of a single red LED under direct sunlight. The result shows that an isolated LED can generate a voltage close to… 1,5 to 2 volts, a value similar to that of a regular battery.
However, the critical point lies in the electric current (amperage). Although the voltage is relatively high, the current generated is extremely low. insufficient to power larger devices.
This behavior occurs because the active area of the LED is very small, limiting the amount of energy captured.
To make the system minimally functional, the video demonstrates two types of electrical connection:
By combining both arrangements, it is possible to assemble a system capable of generating approximately 6 volts, a suitable value for small, low-power circuits.
The final project uses approximately 200 high-brightness red LEDs, arranged on a perforated board.
The process involves:
The work requires meticulous attention, especially to the correct polarity of each LED.
The result is a small experimental panel that generates approximately 6 volts under intense direct sunlight.
To assess actual efficiency, the experiment compares the LED panel with a simple commercial solar panel, found for approximately… R$80.
Although both may exhibit similar voltage under certain conditions, the commercial board generates significantly higher current, which results in significantly higher real power.
The difference occurs because:
While the LED panel demonstrates the physical principle, it doesn’t compete in energy efficiency.
Energy efficiency is determined by the ability to convert sunlight into useful electrical energy. In simplified terms:
Therefore, even with 200 LEDs, the current gain remains limited.
Despite the practical limitations, the project proves three important points:
This transforms the experiment into an excellent didactic demonstration of the principles of electronics and solar energy.
Although it doesn’t replace a real solar panel, a mini LED panel can be used for:
Among the main limitations are:
Furthermore, the cost of acquiring 200 LEDs can exceed the value of a simple commercial panel.
The experiment shows that it is technically possible to build a homemade solar panel using common LEDs and achieve approximately 6 volts under direct sunlight. The initiative demonstrates in practice how the photovoltaic effect works and how different electrical arrangements influence voltage and current.
However, when compared to a low-cost commercial solar module, the efficiency of the homemade solution is significantly lower.
The project stands out as an educational and experimental demonstration of electronics applied to solar energy, highlighting how simple components can reveal fundamental principles of physics and energy generation.
With degrees in Journalism and Marketing, he is the author of over 20 articles that have reached millions of readers in Brazil and abroad. He has written for brands and publications such as 99, Natura, O Boticário, CPG – Click Petróleo e Gás, Agência Raccon, and others. He specializes in the Automotive Industry, Technology, Careers (employability and courses), Economics, and other topics. Contact and story suggestions: valdemarmedeiros4@gmail.com. We do not accept resumes!
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