Solar panels are one of the most important components used in solar energy systems. It produces electrical energy through sunlight (photons) and sends it to the charging regulator and then to the inverter, batteries and electrical loads. Different types of solar panels are available depending on the type of material, its efficiency and manufacturing quality.

Types of solar panels in detail

There are many companies that manufacture solar panels. Solar panels are categorized into three types, Which:

1. Monocrystalline silicon cells.
2. Polycrystalline silicon cells.
3. Thin-film panels.

O no: monocytes (Monocrystalline silicon ):

• This type has a distinctive appearance which indicates the highest purity of silicon crystals.
• enjoys the highest efficiency rates, It may reach more than 20%.
• Shelf life of 25 years or more depending on the quality of the panels.
• The panels are made of black colour, So that sunlight (photons) interact with a crystal of pure silicon.
• While the panels are black, Monocrystalline solar panels have a variety of colors on their panels, side frames, and back.
• Good performance under slightly low solar radiation condition.

The disadvantage of this type of panels is the high cost compared to polycrystalline silicon cells.

Secondly: Polycrystalline silicon cells:

• You can quickly distinguish between these panels because this type of solar panel has squares that do not cut corners, it has many lines, It is often blue in colour.
• Made of melting raw silicone, They are faster and cheaper than monocrystalline silicon panels.
• Shelf life of 25 years or more depending on the quality of the panels.
• Its efficiency is about 16.5%, Because of the low purity of silicon.
• Its disadvantage is that the appearance, As Monocrystalline silicon panels have an aesthetic appearance, But it does not matter to buyers.
• It requires slightly higher installation space than Monocrystalline silicon solar panels

Third: Thin-film:

• The biggest aesthetic factor of this type, It is the thinness of its manufacture and its streamlined shape, which can be folded, unlike the previous types.
• A lot of development and research is going on to make it better suited for use.
• Can be used on the go.
• The high cost compared to its shelf life compared to other types.
• They carry the shortest warranties because their life span is shorter than other types of panels.

The difference between Mono plates and Poly . plates

There is not much difference between the two types, When we say that Mono panels produce 330W, there are also Poly panels that produce 330W, In terms of production, there is no difference between the two.

In terms of the sizes of the two types and the saving in space is very simple:

Currently, we find that the Mono panels have a capacity of 280W and a size of 165*99 and a maximum watt in the poly panels at the same size = 265W.

So space savings = 280-265/265 * 100% = 5.6%

It is a small percentage in terms of saving space between the two types, Since the Mono panels are slightly less than the poly panels in terms of area,

The big difference between the two types is that the appearance, As Monocrystalline silicon panels have an aesthetic appearance, But it does not matter to buyers.

criteria for selecting solar panels, There are several criteria of great importance that you should know before purchasing solar panels, The factors affecting the selection criteria of solar panels are the type of solar panel, its efficiency, warranty and the effect of temperature on the productivity of the solar panel.

Follow this article with us to learn more details about the criteria for choosing solar panels.

Types of solar panels

First of all, you should know the types of solar panels, which are:

• Mono crystalline silicon solar cells :

Manufactured with its distinctive and harmonious appearance, which indicates the purity of silicon, It is widely available in the market with different capacities. It is characterized by high efficiency compared to polycrystalline solar cells.

• Polycrystalline Silicon Solar Cells :

They contain crystals of different shapes and dimensions, and vary in their optical and physical properties. A huge multi-grained crystal is made, from which the necessary plates are cut. It is characterized by a lower price compared to monocrystalline and its efficiency reaches 16.9%.

• Thin-film cells are called thin -film cells. It is made in a flexible, thin, streamlined shape and is lighter in weight compared to the previous types, but its efficiency is low and it is not widely spread in the market.

Solar Panel Selection Criteria

Manufacturers of solar panels put up a special catalog with the data sheet and the guarantee percentage through which we can evaluate the quality of the product, and the most important of these criteria are:

Tolerance Solar Panel Production Capacity

Each manufacturer sets a limit on the production power of the solar panel in percentage terms, which is called Production power tolerance, meaning that each solar panel may produce more power than the written value or less by a certain percentage.

For example, suppose that a solar panel has a capacity of 330W and a permittivity ratio of +/- 5%. This means that the solar panel’s productivity ranges from 320W to 340W.

Some companies are satisfied with setting the tolerance only positive, This means that the value of the power of the board is not less than the actual power of it, but rather increases by an amount proportional to the permittivity.

Solar panel efficiency

Each company sets the value of the efficiency of the solar panel in percentage at Standard Test Condition STC and at solar radiation of 1000 watts per square meter and temperature of 25 degrees Celsius.

The efficiency of the panel by dividing the maximum power by the product of the solar radiation power gives 1000 watts per square meter in the area of the panel.

Solar Panel Warranty

It is one of the most important criteria for choosing solar panels. As most of the global manufacturers of solar panels offer a 10-year warranty on manufacturing defects and a 25-year warranty on performance.

Suppose we have two panels:

Solar Panel One: Offers a 10-year warranty against manufacturing defects, a 90% power output guarantee for the first 10 years, and an 80% warranty for 25 years of the solar panel’s life.

This means that it is guaranteed to change the board when a defect occurs, It also guarantees that when you choose the board after 10 years of operation or delivery, it will not decrease more than 10%, It also guarantees that when measured after 25 years, performance will not decrease by more than 20%.

The guarantee also means that it is possible for the efficiency of the panel to decrease to 90% in the first year and to continue operating at this rate for 9 years, then the efficiency of the panel decreases in the tenth year to 80%.

Solar Panel II : Offers a 10-year product warranty, a 90% linear performance guarantee for the first 10 years, and a 80% linear performance guarantee for 25 years.

It means that it provides a “Linear” performance guarantee, which means that the production of the solar panel decreases by no more than 1% annually, and then the benefit increases, it operates more efficiently and produces more energy over a period of 25 years.

Given the phenomenon of early deterioration, Some manufacturers put a performance guarantee for the first year, saying that the power is not less than 3% to 5% for a period of one year from the date of delivery.

Average Operating Temperature (NOCT)

It is one of the most important criteria for choosing solar panels. It is called in English (Nominal Operating Cell Temperature).

Solar panel manufacturers subject their products to laboratories at 25°C. But the data values of the solar panel are different on site meaning that it will operate at temperatures well above 25°C.

Therefore, here we have to measure the performance of the solar panel at different conditions from the standard test conditions, such as measuring the temperature that the solar panel will reach in the open circuit mode.

As the temperature increases on the solar panel, the efficiency decreases by an amount that depends on the ratio of volts per degree Celsius, We find this percentage in the solar panel temperature coefficients catalog or data set by the company. Which we will explain in the thermal coefficient of solar panels.

Thermal coefficient of solar panels

It is one of the most important factors affecting the selection criteria for solar panels. It is called in English in English (solar panel temperature coefficients).

are the thermal properties that we find in the solar panel data, Which we use to determine the loss or yield in the characteristics of the solar panel from the values of voltage, current and electrical capacity with increasing temperature.

When reading the value of the heat coefficient at the open circuit voltage, you will notice that the voltage value will decrease when the temperature rises by one degree Celsius, and the value will be negative, The value of the current will also increase by a certain amount when the temperature is increased.

for example, If the temperature coefficient at the maximum power of the solar panel (Temperature Coefficient of Pmax) is -0.43%/

This means that the capacity of the panel will decrease by -0.43% when the temperature is increased by 1°C, Simultaneously, the voltage decreases by -0.032%/ (Temperature Coefficient of Voc), The current increases by 0.047%/ (Temperature Coefficient of Isc)

Solar Panel Certification

There are several certificates that guarantee that the specifications of the solar panel are compatible with the product, and some of these international certificates are:

IEC 61215 Certificate: Describes requirements for the quality of solar panels and performs tests to determine mechanical and electrical properties to comply with solar panel data.

IEC 61730 Certificate: Describes safety requirements as well as tests for solar panels, It must be of Class A class to withstand electrical hazards.

UL LTED Certification: is an American safety consulting organization and one of the world’s largest and certified to perform safety testing and laboratory inspection.

CE marking: Describes the product’s compliance with the requirements of European Union regulations.

What are bifacial solar panels? Year after year progress and development in the generations of solar panels, From simple panels to traditional panels with marked improvement in efficiency, Then the half-cell technology down to the two-sided solar panels with higher efficiency.

In this article, we will discuss the changes and developments that have contributed in recent years to improving the productivity of solar panels.

The technique adopted in the formation of solar cells

Half-cell technology got its start in 2014 thanks to REC Solar, Since then, most companies have turned to manufacturing their cells with this technology, which has contributed to improving the performance and durability of the solar panel.

Among the advantages of the panels manufactured using the half-cell technology:

• doubling the number of cells from 60 to 120, Or from 72 to 144 cells.
• Contributed to improving performance.
• Its yield is higher than that of traditional (whole cell) panels.
• Cutting the cell in half increased its mechanical durability.
• This technique worked to reduce the percentage of loss resulting from the internal resistance of the cells.
• It is not affected with the shade as much as the traditional cells that once exposed to a small part of the shade nullifies the production of a quarter, half or the entire panel.

Half Cut Cells Solar Panels

Half Cut Cells Solar Panels Most companies have turned to manufacturing half-cell solar panels because of their advantages that make them better than ordinary panels – with a full cell – in terms of efficiency, yield and space.

What are the half-cell solar panels? Why do experts prefer it over regular panels? Follow us to learn about the important questions about the advantages of solar panels that purify half the cell over regular solar panels.

What is half solar cell technology?

The half-cell technique Half Cut Cell) is created by separating a single silicon cell into two halves evenly by a laser, The purpose of this is to improve productivity performance and increase durability, unlike regular full-cell panels.

But the question remains, are there other advantages of panels with half-cells over panels with full cells?

Of course, there are many other advantages that we will mention in this article, such as reducing losses caused by resistance, And it can produce energy even though there is a shadow on a specific part of the board, In contrast to full-cell panels that cannot produce electrical energy or may only produce a quarter depending on the number of cells exposed to shade.

Formation of half-celled plates

Half-celled plates can be distinguished from whole-celled plates by looking at, Since the plates with half-cells are divided into two parts, Each section has three strings so the number of strings becomes 6.

Since the cell has been divided into two halves, The number of cells in the solar panel will double to 120 instead of the 60 cells in the full-cell panel.

You will also notice the presence of three Junction Boxes, In order to distribute the three By-Pass Diodes evenly over the six cell chains as shown in the image.

Half-cell panels effect with shadow and hot spots

O no: When there is a shadow on a quarter of the board or on one of a total of 6 strings, The energy loss will be only 15%. In contrast, full-cell panels may lose 30%.

Secondly: Half-cell technology contributes to reducing heat, As a result of reducing the current in half.

Third: Reducing the resistance of the connections by increasing the number of busbars that you can see with the naked eye on the surface of the solar cells.

Fourthly: Since the half-cell technology is designed on the basis of reducing the current, resistance and heat generated, The potential for hot spots to occur is very low.

Advantages of half-cell solar panels

• Less prone to hot spots.
• Increase energy productivity.
• Low percentage of energy lost when exposed to shade.
• Cut the current in half.
• Do not generate high heat.
• More buses to reduce resistance.

Conclusion: It can be said that the solar panels with half-cells (Half Cut Cells) exploit their full production capacity, By reducing losses while reducing the possibility of hot spots that occur as a result of high temperature.

What are bifacial solar panels?

After we got acquainted with the panels designed with half-cell technology, We will talk about another topic, which is a feature that complements the feature of the half-cell technology, which is the two-sided solar panels.

The researchers conducted studies and practical experiments on the double-sided panels, It has been reached as a result that the back face of the panel can increase the energy production by up to 30%, Depending on the type of surface reflected and the amount of light reflected, the ratio may be lower than the maximum.

Here is a data sheet for several models of dual-sided solar panels from Canadian company.

What we notice from the data of the following double-sided solar panel model “CS7N-640MB-AG”:

• If the yield of the back side of the solar panel is 5%, The panel’s output increases from 640W to 672W.
• If the yield of the back side of the solar panel is 10%, The panel’s output increases from 640W to 704W.
• If the productivity of the back side of the solar panel is 20%, The output of the board increases from 640W to 768W.

datasheet dual sided solar panel

We offer you a double-sided solar panel data sheet from Canadian Solar.

 

Ways to rationalize the consumption of electrical energy

Methods of rationalizing the consumption of electrical energy, The importance of electrical energy around us has a great role in enhancing our daily life. Where the users of electrical appliances should reduce the proportion of consumption to reasonable values, Or, you can replace the old devices with newer ones that save electrical energy consumption to contribute to reducing the monthly bill. Preserving electricity sources for future generations, What are the ways to rationalize the consumption of solar energy and what is its impact on the economy.

Benefits of rationalizing electrical energy consumption

The rationalization of electrical energy consumption contributes to many benefits, the most important of which are:

• Reducing the use of petroleum resources and its derivatives.
• Helps reduce emissions that affect the environment.
• It works to raise the state’s economy, which helps the possibility of building solar energy projects.
• Reducing the wasteful use of electrical energy.
• Reducing the value of the subscriber’s monthly electricity bill.
• Contributes to relieving stress on the electrical network by a large percentage.
• Extend the life of electrical appliances.

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Ways to rationalize the consumption of electrical energy

• Use energy-saving lighting units and turn them off at bedtime, in vacant areas, and when there is sunlight. It is also preferable to paint the walls in light-reflecting colors to reduce the number of lighting units.
• Install a timer device in the places of the stairs to turn off the lighting units after several minutes of operation.
• Set the air conditioner to a temperature not less than 24 degrees, Turn off the air conditioner when you leave the house. And we know that using the air conditioner in the right way contributes to reducing the cost of monthly electrical energy consumption by a large difference. It is an important pregnancy and has a major role in creating a balance by reducing the cost of the monthly bill.
• Stop turning on unnecessary electrical appliances sometimes, Like: Leave the TV on while you sleep at night.
• It is preferable to replace old devices that are a burden for consumption with modern energy-saving devices such as: Replacing your old electric oven or dishwasher with modern, energy-saving appliances.
• Rely on the solar heater as much as possible instead of running the electric heater.
• Clean the condenser at the back of the refrigerator once a year to remove accumulated dust, As dust reduces the efficiency of the refrigerator, which leads to an increase in its consumption of electrical energy.
• Avoid random and excessive operation of household electrical appliances.

The effect of rationalizing electrical energy consumption on the economy

The positive use of electrical appliances contributes to alleviating the burden on power plants and power transmission networks. In addition to raising the state budget by reducing oil consumption, And relying on building solar power plants to generate sustainable electric power without relying on traditional sources such as petroleum, which has been threatened with extinction over the years.

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