Solar panels may seem like complicated pieces of equipment since they turn sunlight into usable, 100% clean energy for our homes. In reality, they're pretty simple. In this guide, we'll explain how solar panels are made, what they're made of, and where they're manufactured to give you a more holistic view of solar technology.
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Calculate how many solar panels you need to power your specific homeSolar panels are made of four primary materials: silicon, metal, glass, and plastics. Each component has a distinct purpose:
Silicon makes up the solar cells, which are the part of the solar panel that converts sunlight into electricity.
Metals create a protective frame that protects the panel and holds it in place. Solar panel frames are usually made of aluminum.
Glass covers the silicon solar cells and protects them from the elements.
Plastic acts as a backsheet that protects the back of the panel.
Some other materials come into play, as well, like the sealants used to hold the panels together, materials within the wiring and busbars that bring the solar electricity to your home.
How exactly do these materials all come together to create a functioning solar panel? There are a few key steps to understand.
The process starts with mining raw materials. Silicon comes from quartz minerals, which are mined and purified to separate the silicon. Solar cell manufacturers use high temperatures to grow a silicon ingot, which is essentially one large block of silicon that is sliced into wafers.
Silicon is a natural semiconductor, but it is usually “doped” with boron or gallium to improve performance. Phosphorus is also used to make the solar cells operate as efficiently as possible.
The solar PV cell is then coated with an anti-reflective coating, allowing more sunlight to reach the cell for increased efficiency. More sunlight means more excited electrons, which means more electricity is generated for your home. Thin lines are then cut into the cells to capture and move the electrical current within the cell.
Some solar panel brands make their own solar cells, while others purchase them from a stand-alone solar cell manufacturer.
Once the solar cells are made, the solar panel manufacturer will solder them together to create a sheet of cells. Most solar modules for homes have 60 cells, while commercial solar panels have 72 cells.
Solar panels are more than just a sheet of solar cells. Once the cells are soldered together, a backsheet is added to protect the underside of the solar cells. Next, the manufacturer will encapsulate the solar cells and backing sheet under a sheet of reinforced glass and inside a metal frame for stability.
The last step of the process includes installing the peripherals, like wiring connections and junction boxes. Junction boxes are where the internal wiring of the solar panel and the external connections meet, keeping them safe and protected from weather and other external factors.
Some solar panels, called AC-solar panels, have inverters attached to them during the manufacturing process.
Most manufacturers will also put the panel through rigorous testing to ensure product quality and efficiency. Any cracked or bent solar panels will be discarded, and the rest will be tested to make sure they can stand up to intense weather conditions, heat, and normal wear and tear.
They’ll also test that the electrical current travels through the panel efficiently so it can generate solar power as it should.
Work with a solar installer to determine what solar panel type is best for your homeMost of the solar panels in the world are manufactured in China. According to the International Energy Agency, China accounts for almost 75% of global solar module manufacturing. Vietnam, India, Thailand, Malaysia, and the United States are also responsible for a portion of solar manufacturing.
With the Inflation Reduction Act of and new tariffs introduced by the Trump Administration, there could be a boost in solar panels made in the United States.
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Now that you know how solar panels are made, you can get a better understanding of the different types of solar panels and choose the one that best meets your needs when you go solar.
Monocrystalline solar panels contain solar cells that are each cut from a single silicon crystal. The uniform construction of a single silicon crystal makes for a more efficient solar panel, which means more energy production and more electric bill savings.
Monocrystalline solar panels are slightly more expensive than other types, but they generate the most electricity and are the most popular type of solar panel used for home solar.
Polycrystalline solar panels use solar cells that are made from fragments of multiple silicon crystals. The fragments are melted together, which makes for a simpler and more affordable manufacturing process, but they don’t produce electricity as efficiently as monocrystalline solar cells.
Manufacturing processes of monocrystalline solar cells have also become cheaper as the technology is more widely used, making the price difference between poly and mono solar cells almost negligible.
You will almost never get a home solar quote using polycrystalline solar panels.
Thin-film solar panels don’t use rigid silicon crystals and instead make use of doped metal oxides called transparent conductive oxides (TCOs). These sheets absorb sunlight similarly to silicon wafers, but they’re flexible.
Thin-film panels have lower efficiency ratings than most monocrystalline and polycrystalline panels, but they’re flexible and allow for installation over a variety of surfaces, like curved RV roofs.
We do not recommend making your own solar panels, although it might seem easy to configure a panel with all of the proper materials. Errors in building your own panels, like starting a fire, outweigh the benefits of DIY solar panels.
It is best to rely on professionally built solar technology because they are built with rigorous standards and tested for durability. Finding the best solar panel company for your needs is is an important step to making sure your solar panels are made with high-quality materials that will provide solar power for their 25-year warranty, or more. Renewable energy from solar panels is one of the best electricity sources for reducing carbon dioxide from fossil fuels, so adding them to your home is a great way to be part of the clean energy future.
A solar panel is a set of solar cells that convert light energy into electric energy. A number of solar panels, a battery, interconnection wiring and an inverter constitute a large photovoltaic system that generates electricity for residential and commercial applications. Silicon material is of prime importance in manufacturing solar panels. Most of the solar panels are monocrystalline or polycrystalline modules. The efficiency of the solar panels depends on their construction. The panels produce electricity within the frequency range of light incident on the panels.
Unlike other energy sources, solar panels do not pollute the environment while generating electricity apart from the pollution associated with the production and transportation of a solar cell. In addition, solar panel installations are maintenance-free, and have prolonged service life and silent operation. They require little maintenance, have no moving parts and can be operated efficiently. In spite of the high initial cost, solar panel systems are now being increasingly used to generate electricity in remote villages for electrification, irrigation and to pump water as well.
The basic raw material of a solar panel is pure silicon. However, the outer frame enclosing an array of solar cells in each solar panel is made of glass. The glass must be highly transparent to allow the sunlight to penetrate the frame. Moreover, for maintenance and safety purpose, the glass used in the panels should not be brittle.
Solar panels constitute two forms of silicon - crystalline and amorphous. Crystalline silicon cut and made into disks of 1 cm thickness is polished to act as a material for absorbing light. Solar panels also employ cooling materials to prevent damages caused by overheating. On the other hand, panels made of amorphous silicon can be continuously rolled and made into extremely thin silicon chips that can absorb different parts of the solar spectrum. Amorphous silicon is also less susceptible to damage during installation and transportation when compared to the crystalline form.
The solar module consists of a silicon semiconductor covered by a protective material in a metal frame. The protective material is provided with an encapsulant of transparent butyryl plastic or silicon rubber attached around the cells. The cells are then embedded in ethylene vinyl acetate. The back surface of the module is coated with a polyester film. The electronic components are made up of copper.
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The steps involved in fabricating a conventional polycrystalline silicon panel are as follows:
Solar panels are the most popular way of using the sun's energy to generate electricity for household and commercial applications. Most of the commercially available solar panels have a life expectancy of at least 20 years. The warranty given by the manufacturers for the first 10 years is more than 90% and over 80% for the second 10 years. However, with proper maintenance, solar panels can actually last nearly 40 years. Some solar panels are capable of giving 80% power output even after 40 years.
Researchers at the Centre for Alternative Technology in the UK, can determine the life expectancy of solar panels by installing 180 panels with an estimated peak output of 75W in . When they again tested the panels in , it was found that the panels had an output capacity of 68.5W, which is just 9% decrease over 13 years. Hence they concluded that even though panels experience certain physical damages, the effect of this on their performance was very limited. This suggests that the solar panels are capable of producing electricity for 30 years or more.
How to make Solar Panels - Run Time 5:11mins
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