What are Solar Panel (2019)

What are solar panels?

  1. Solar panels are the main component of solar systems that generate electricity
  2. Cells are made of semi-conductive materials such as silicon that absorb light from the sun.
  3. Silicon is very shiny in nature, so in order to take advantage of the photons and prevent them from reflecting away from the cell, an anti-reflection coating is applied to the cells.
  4. A glass cover is placed on top of the solar panel to protect the silicone material from external factors and scratching.
  5. The panel consists of a group of PV cells connected to one another and connected to one another
  6. Standard miter cells 15.6 * 15.6 cm
  7. The panels of 255-285 watts contain 60 cells (6 * 10) and a size of 99 * 164 cm

What are Solar Panel (2019)

  1. The 315-335 watt panels contain 72 cells (6 * 12) and are 99 * 196 cm in size
  2. If a set of panels is assembled in a solar system, we call it a photovoltaic matrix or a solar array . CLICK HERE::::IPHONE X

Types of solar panels:

And there are available in the markets of three main types:
  1. Monocrystalline Silicon
    Monocrystalline panels have a symmetrical appearance that indicates the purity of silicon crystals. 
    Monoblastic cells are silicon alloys that have been sliced ​​into strips. 
    You can see that the cell characters are not aligned, which gives the monochrome panels their distinct appearance as shown in the picture. 
    These plates are the most expensive species, 
    giving an efficiency of up to 22.5% in the laboratory, but the cells actually commercially spread in 2017 are more than 17.5% of the 
    life span of 25 years or more

What are Solar Panel (2019)

  1. Polycrystalline silicon cells
    The difference between them and monocytes is very clear in terms of shape in the two pictures, where the cells are rectangular squares. 
    They are lower in price compared to monocytes. 
    Its efficiency is about 16.9%. Its 
    25 years of life or more is the 
    only fault that does not matter to many, but it sometimes takes into account that its appearance is not as aesthetically pleasing as the beautiful smooth blue appearance of monovalent solar panels.    https://tocywo.com/u4dl

What are Solar Panel (2019)

  1. Thin Film
    This type of solar panels is thin and streamlined as is evident in the picture and takes the form of the surface on which it is installed. 
    Most of the developments and researches currently underway are based on development in this particular type because of its smoothness, weight and low thickness. 
    Valid for many applications such as the roofs of boats and transport vehicles 
    from the disadvantages that it is less species efficiency Vkvaitha may not exceed 12% 
    old default less than its counterpart unilateral and multilateral , and up to 15 years only the 
    most expensive species price if the old default short account in the equation of the price https://tocywo.com/uL5Lumhf

panels. There is no preference between mono and polycrystalline poly panels in terms of electricity generation.They have the following characteristics:
  • Generate identical electricity! When comparing 100 watts of Mono cells with 100 watts of poly cells, the generation of electricity is equal to 
    100 watts of cells being able to generate 100 watts / hour at specific laboratory conditions. 
    Either trying to differentiate between the productivity of cells with equal capacity is funny and very naive. 
    Because simply if the factory found the productivity of the cell when the test more than 100 watts and be like 105 will write on it 105 faster to increase its profits and to give this difference to the consumer free of charge !! 
    So the myth is that Mono panels produce more electricity
  • The sizes of the panels are identical and the space saving is very simple. 
    When you buy a 250-265-watt solar panel from any dealer, you will find a space of 99 x 164 cm 
    . When you search for a 270-280 Watt mono panel anywhere in the world you will find that it is 99 * 164 cm اضأ !!!! 
    And once again challenge anyone can come to us with a solar panel of a different area from these figures 
    and the two types are manufactured in identical sizes until there are standard installation systems suitable for all models. 
    The development that happens over time increases the capacity of the board while maintaining these standard 

measurements. For example, when manufacturing cells and the latest model the size of the board becomes 97 * 160 instead of 99 * 264. 
But we find that the size remains constant with the development, but the ability of modern models It has become 285 watts instead of 250 watts two years ago
Mono and Poly panels are available in the market 
. Currently, the Mono panels are 280 watts in size 99 * 165 
while the maximum in the Poly panels is about the same size = 265 watts 
in space = 280-265 / 265 =
  • 5.6%Ifonlyfor a lie, the Mono cells are much higher then they need much less space !!!
  • The effect of temperature is also identical 
    . At this point, superstitions spread in a large and complex manner. They speak of imaginary differences between the two types due to high temperature, ice, etc., without any scientific support 
    , but when reading the Datasheet which is written by the manufacturers of any plate we will discover that The difference between the two types in relation to the effect of heat is a very marginal difference that has no concrete result in practical application. Mono and polycrystalline cells have an equal temperature coefficient of pMax from -0.42% to -0.49%
    . The two types are made of the same material and are the flow Won
  • The default age is the same 
    as before. The two types are made of the same material and have the same default 
    and the same 
    degradation. The same warranty period. We challenge anyone to provide us with information about a company that gives a guarantee for poly panels with a period of time and different conditions for securing panels. The Mono
  • But if the efficiency of Mono cells is 20% and Poly 17% where is this difference ??? 
    1 - models Mono panels of the same size and have a higher than the models of Poly (but one of the same capacity produces the same electricity as explained) 
    2 - that the look at the cell Mono find that the edges are washed, these edges empty to produce any electricity.   https://tocywo.com/u4dl
From the above, it is clear that   https://tocywo.com/uL5Lumhfthe only difference between the Poly and Mono panels is the appearance
. As the Mono panels are expensive, the only question you should ask yourself when choosing between Poly and Mono solar panels is:
  • Am I willing to pay the price difference to get this better look?
  • If you are implementing a project in an institution building, and the purpose of the implementation is to obtain a certificate of "environmentally friendly building" and to do publicity for the institution, certainly the preference for free Mono in this case
  • If you are like a simple peasant who wants to build a station to pump water from a groundwater well, it is funny to choose Mono and pay more money without any need. And do not let a ignorant or evasive vendor convince you otherwise

How to connect a solar panel matrix

The matrix consists of several panels connected to each other in parallel or in parallel to achieve the required voltage and current design. 
When the series is connected, the value of the voltage multiplies and the amp remains constant. When connected to Parallel, the amp is multiplied and the voltage remains constant. 
Whatever the type of installation is parallel, parallel or dual, the total energy does not change. When the 10 panels are connected with 250 watts, the total power is 2500 watts, regardless of the mode of connection.
  1. It is important that all panels be of the same type, capacity and condition. This improves the safety and performance of the slab matrix
  2. Serieslinks include the positive (+) connection from the board to the negative (-) in the corresponding panel. In all the panels, in the back cable, the positive pole is supplied with a red MC4 and MC4 black cable, and a male is connected with the net in the opposite board without having to make any other connections. 
    To connect 6 panels respectively with the following specifications: 
    Short circuit current Isc = 8.75A Short 
    circuit voltage Voc = 37.5V Total 
    voltage of the matrix = 37.5 * 6 = 225v Short 
    circuit current remains at 8.75A

    The delivery method is chosen according to the needs and specifications of the charging regulator or alternator. For example, if the charging regulator accepts a vol = 150 volt, this means that the number of panels should be more than 4. 
    It is always better to select the regulator that accepts the largest number of panels in a row to increase the voltage and reduce the conductivity on the distribution. Possible. This saves the wire section and reduces system loss. 
    There is a maximum limit to the voltage that the Maximum System Voltage solar panels currently have on the market. This value is equal to 1000 volts. This means that the maximum number of panels can be connected respectively = 1000 / 37.5 = 26 panel
  3. Parallellinks include positive connection (+) of all the panels together and the connection of all negative contact points (-) with each other. In this case, two and three-way MC4 connectors should be used to make these connections. In case of increasing the number of lines connected in parallel to each other than 3 must be assembled in the Combiner Box and the use of brass bars to carry out these assemblies. 
    To connect 6 panels in parallel: 
    the short-circuit voltage remains constant at = 37.5v Combined short 
    circuit current = 8.75 * 6 = 52.5 amps

    It is noted here that if the distance between the panels and the charger regulator 20 meters, and we entered this data on the program of calculation of the wire section will need a wire 50 mm 2 to maintain the rate of loss of 2%, which is a very large value, which makes this connection in parallel solution It is futile for any respected engineer to understand the principles of solar cell connections. If the proposed shipping regulator is allowed to connect the panels respectively, in this case the dumpster should be thrown in the garbage and replaced with a good type!
  4. Serial and Parallel CombinationIn this method, the voltage is identical to each line of the line to be connected in parallel. 
    A total of three plates are connected in parallel and two parallel lines are made with a total of 6 panels: 
    short circuit voltage = 37.5 * 3 = 112 V Combined short 
    circuit current = 8.75 * 2 = 17.5 amp 
    . This matrix is ​​suitable for feeding a 112.5V In the PV panels entrance in.

    This method of conduction is the most common method where the maximum value of the matrix array for any charging regulator is rare, which corresponds to the combined voltage of all the panels. 
    If the length of the wire is 20 meters and the input of the data in the wire section calculation program as a result of the calculations it will appear that we need a 6 mm 2 wire segment which is a reasonable value other than the value we get when trying to connect all the panels in parallel. 
    It is worth mentioning that all current transformers for solar pump systems and network-related current transformers usually receive up to 800 volts of the panel matrix. 
    Here, 20 panels are connected respectively in lines of about 5 kWh. A 20 kW solar system to feed a pump usually consists of 4 Strings lines, each line of 5 kW with a voltage of 700-800 volts.
    The shipping organizations of the systems separated from the network usually receive a voltage ranging from 50 volts for systems smaller than 1 kW and 150V for medium and economic systems with capacity of 3 to 5 kW, and up to 600v in good qualities in systems larger than 3 kW.   https://tocywo.com/uL5Lumhf

Methods of knowing the quality of solar panels

With the naked eye and simple measuring devices, the quality of the solar panels can be determined according to the following:
  1. Number of silver bands in the cell Busbars
    The Bus Bar is the vertical metal lines found in the solar cells. They are silver wires that allow for the flow of electricity , and are connected to each other respectively to be the voltage of one cell in the solar panel 0.5 volts. 
    The cost of these rails is high and represents a large percentage of the total cost of the cell. The 
    importance of these bars: 
    1 - give the durability of the cell up to 25 years old, which must withstand the difficult weather conditions of wind and temperature varying 
    2 - reduce the loss of productivity in the event of occurrence Cell cracks due to weather conditions     https://tocywo.com/u4dl

What are Solar Panel (2019)

  1. Two plates with 3Busbar and 5BusBar cells
    The old and cheap models of cells have three connecting rods just as in the panel on the left. - 3BB 
    New and commercially deployed models have 4 rods - 4BB 
    There is also advanced cell technology with 5 bars as in the panel on the right of the picture - 5BB 
    When buying a good board make sure that the cells are 4BB and not 3BB
  2. Type of glass
    Glass thickness of 3.2mm is usually used in manufacturing solar panels. 
    This glass is rough from the double sided and this is required. 
    1. The inner face is heated because during the manufacturing process the cell needs to be fully bonded with the glass. The glass of the smooth glass does not hold well and will remove the lamination. 
    2 - The outer face is also coarse to help absorb the sun and reduce the reflection as shown in the picture
    Absorption of lightThe use of coarse glass from both sides increases the cost of producing the solar panel 
    in the cheap types of panels. The external surface, such as mirrors, can be seen when the surrounding objects are clearly visible, such as any other window panes. Unfortunately, many people think that the whiteboard Is the most quality!High-quality solar panels are made of thermo-reinforced glass, like glass. 
    Its carrying strength is six times the normal glass strength. 
    The advantage of using reinforced glass in solar panels is to help withstand the impact of cold and wind and snow loads 
    when broken glass breaks into small pieces harmless instead of large pieces with sharp blades such as ordinary glass. 
    Cheap types of solar panels produced by small companies use ordinary glass, which can withstand weather conditions rather than causing the low productivity of panels of energy over time.
  3. The presence of the diode Bypass Diodes
    On the back of each panel there is a black plastic box with positive and negative wire outlet 
    inside the box. The cell lines are grouped together to provide the combined voltage of all the cells. 
    For example, three 11 volt lines are assembled respectively to obtain a 33 volt solar panel 
    , but when assembling these lines, an electric piece known as the Bypass Diode must be used as in the picture
    What are Solar Panel (2019)
    A collection box with 3 diodes

    In certified and non-certified solar panels, these valves are not used for cost saving as in the picture
    What are Solar Panel (2019)
    Free tray without any diode - Unsupported product

    These diodes have two functions:
    1. To understand the function of these valves, we present the following example: 
      a solar panel consisting of 60 cells where each 20 cells are grouped in a row in a line that goes to the plastic assembly plate at the back of the plate, where there are 3 lines of 60 cells 
      when the cells are connected respectively in a line connected to each cell In the line, energy is produced according to the weakest trait 
      . If the line is made up of 20 cells and one of these cells has a shadow and is not exposed to the sun, it will significantly limit the energy output in all the other 20 cells. 
      The combination of these 20 cells in the plastic box with the rest of the other 40 cells in the assembly tray without the presence of the two diodes bypass Diodes, it also affects the productivity of the remaining 40 cells due to the existence of only one cell shaded !! 
      But with the use of diode this shading is limited to only the first 20 cells where the remaining cells are not affected.
      Hence, we conclude that the Bypass Diodes reduce the rate of loss in the productivity of solar panels in the case of exposed part of the board to the shadows 
      and the greater the number of valves, the better the 
      most commercially available solar panels containing 3 Bypass Diode
    2. Another function of the diode is to prevent hot spots on solar panels. 
      When a part of the board does not generate electricity properly due to shading, dirt and damage, the rest of the system can see this part of the circuit as a load load, 
      which leads to the flow of electricity to this part, which may lead to solar and solar panels, and Here comes the importance of diode, which prevents the flow of electricity in the opposite direction!
  4. Measuring the capacity of the solar panel
    An ordinary multimeter can be used to measure the solar panel
    What are Solar Panel (2019)
    There are two different readings that must be checked to make sure that the solar panels are working properly and see how much energy they generate.
    1. Volt measurement 
      - Solar panels are completely separated from the battery and charging regulator 
      - the board is directed towards the sun 
      - ensuring that the aviometer is set to measure the voltage between the positive and negative electrode of the panels
    2. Isc measurement The same steps are done, but the avmeter is set to measure current
    The capacity of the board can simply be measured after reading these values ​​using the following equation 
    Power = Voltage * Amps 
    If the voltage reading is 37.5 and ampere 6, 
    the board capacity = 37.5 * 6 = 225 watts 
    The plate capacity is determined based on a laboratory test under grade Temperature of 25 ° C and special conditions in the laboratory 
    so it is impossible to get the same value of the ability written on the board when measuring voltage and current in the previous way. 
    But it is possible to know the efficiency of the board to be tested compared to another board to be tested at the same time and place 
    and approximate The plate must not be less than 80% of the ability written on it, when the test in the middle of the day, Sun rays
    This simple test can also be used to measure and identify any faulty plate within a large package  https://tocywo.com/u4dl

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What are Solar Panel (2019) What are Solar Panel (2019) Reviewed by Bushraah88 on May 24, 2019 Rating: 5

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