There are 3 types of solar panels available on the market:
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monocrystalline solar panels
polycrystalline solar panels
thin film solar panels
Thus, at cell structure level, there are different types of material for manufacturing, such as mono silicon, polysilicon or amorphous silicon (AnSi). The first 2 kinds of cells have a somewhat similar manufacturing process. Read below about the steps of producing a crystalline solar panel.
It all starts with the raw material, which in our case is sand. Most solar panels are made of silicon, which is the main component in natural beach sand.
Silicon is abundantly available, making it the second most available element on Earth.
However, converting sand into high grade silicon comes at a high cost and is an energy intensive process. High-purity silicon is produced from quartz sand in an arc furnace at very high temperatures.
The silicon is collected, usually in the form of solid rocks. Hundreds of these rocks are being melted together at very high temperatures in order to form ingots in the shape of a cylinder. To reach the desired shape, a steel, cylindrical furnace is used.
In the process of melting, attention is given so that all atoms are perfectly aligned in the desired structure and orientation. Boron is added to the process, which will give the silicone positive electrical polarity.
Mono crystalline cells are manufactured from a single crystal of silicon. Mono Silicon has higher efficiency in converting solar energy into electricity, therefore the price of monocrystalline panels is higher.
Polysilicone cells are made from melting several silicon crystals together. You can recognise them by the shattered glass look given by the different silicon crystals. After the ingot has cooled down, grinding and polishing are being performed, leaving the ingot with flat sides.
Wafers represent the next step in the manufacturing process.
The silicon ingot is sliced into thin disks, also called wafers. A wire saw is used for precision cutting. The thinness of the wafer is similar to that of a piece of paper.
Because pure silicon is shiny, it can reflect the sunlight. To reduce the amount of sunlight lost, an anti-reflective coating is put on the silicon wafer.
The following processes will convert a wafer into a solar cell capable of converting solar power into electricity.
Each of the wafers is being treated and metal conductors are added on each surface. The conductors give the wafer a grid-like matrix on the surface. This will ensure the conversion of solar energy into electricity. The coating will facilitate the absorption of sunlight, rather than reflecting it.
In an oven-like chamber, phosphorous is being diffused in a thin layer over the surface of the wafers. This will charge the surface with a negative electrical orientation. The combination of boron and phosphorous will give the positive – negative junction, which is critical for the proper function of the PV cell.
The solar cells are soldered together, using metal connectors to link the cells. Solar panels are made of solar cells integrated together in a matrix-like structure.
The current standard offering in the market are:
48 cell panels – suitable for small residential roofs.
60-cell panels – this is the standard size.
72-cell panels -used for large-scale installations.
The most common sized system in terms of kWh for UK homes is the 4kWh solar system.
After the cells are put together, a thin layer (about 6-7 mm) of glass is added on the front side, facing the sun. The backsheet is made from highly durable, polymer-based material. This will prevent water, soil, and other materials from entering the panel from the back. Subsequently, the junction box is added, in order to enable connections inside the module.
It all comes together once the frame is assembled. The frame will also provide protection against impact and weather. The use of a frame will also allow the mounting of the panel in a variety of ways, for example with mounting clamps.
EVA (ethylene vinyl acetate) is the glue that binds everything together. It is very important that the quality of the encapsulant is high so it doesn’t damage the cells under harsh weather conditions.
Once the module is ready, testing is carried out to ensure the cells perform as expected. STC (Standard Test Conditions) are used as a reference point. The panel is put in a flash tester at the manufacturing facility. The tester will deliver the equivalent of 1000W/m2 irradiance, 25°C cell temperature and an air mass of 1.5g. Electrical parameters are written down and you can find these results on the technical specification sheet of every panel. The ratings will reveal the power output, efficiency, voltage, current, impact and temperature tolerance.
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Apart from STC, every manufacturer uses NOCT (nominal operating cell temperature). The parameters used are more close to ‘real life’ scenario: open-circuit module operation temperature at 800W/m2 irradiance, 20°C ambient temperature, 1m/s wind speed. Again, the ratings of NOCT can be found on the technical specification sheet.
Cleaning and inspection are the final steps of the production before the module is ready to be shipped to homes or businesses.
Research and development in the solar energy industry is aiming at reducing the cost of solar panels and increasing efficiency. The solar panel manufacturing industry is becoming more competitive and is forecasted to become more popular than conventional sources of energy, such as fossil fuels.
If you’re interested in joining thousands of UK homeowners who have already switched to renewable energy, GreenMatch can help you take the first step. By getting multiple quotes you can be assured you’re getting the best deal.
Start getting quotes from trusted solar panel installers today, by filling out our 1-minute contact form! You’ll be offered up to 3 free quotes that you’re able to compare and choose from to find the best deal. This service is completely free and non-binding!
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You know solar panels as the futuristic-looking black or blue rectangles that soak up sunlight and bring down your energy bills. You might even get the technology behind how they work. But how are solar panels actually made? What are the stages to produce these modern marvels in clean energy?
We’ll look at the manufacturing process for most common panels, photovoltaic or PV. Photovoltaic cells make electricity from sunlight. Basically, they do this by enabling light particles from the sun to knock electrons from atoms in the PV cells. Here’s how a solar panel is put together to do just that on your rooftop day after day.
The most common material to create PV cells with is silicon crystals. Some of the development processes depend on individual manufacturers and specifically what kind of panels they make. There are a single layer or multiple layer panels, for example. But here are the basics.
The first step in making a solar panel is to mine and purify silicon. Purification is usually done with an electric furnace. Thankfully, silicon is a highly abundant resource. In fact, it’s the second most abundant element (right behind oxygen) on the planet. It’s mined around the world, but in the U.S., it’s found primarily in the Midwest and the South.
Pure silicon cylinders, known as “ingots” are then sliced into paper-thin disks or wafers. These are then further trimmed into rectangles or hexagons. This is so they can fit together perfectly within the frame of a solar module and maximize the area.
By treating the polysilicon with boron and phosphorus, a positive and negative charge is created. This P/N junction is where the electricity happens. Wires connect the tiny electricity semiconductors with metal to creates paths for the electricity.
The cells are coated with an anti-reflective substance so they don’t simply reflect sunlight back but capture it. Then they’re sealed into an acetate, often made of rubber or vinyl. The panel is placed into an aluminum frame and sealed beneath a sheet of glass or plastic to create the much-anticipated solar panel.
Much of the work for solar panels is done by precision-level robotics. These robot workers are part of the reason solar prices are becoming more competitive. Some aspects are fully automated, but some are still run by technicians.
As a whole, the solar industry (from manufacturing all the way through sales and installation) employed more than 250,271 Americans in 2017.
If you’re interested in getting the most climate-friendly solar panels, check out this post on the greenest solar panels. If you’d like to learn more about the differences between the two main types of solar panels, read this post on monocrystalline vs. polycrystalline panels.
Also, check out this video to find out the difference between mono and polycrystalline solar panels.
If you want to learn more, please visit our website Customized 270w Polycrystalline Solar Panels.