Some precautions for cleaning PV modules

Photovoltaic modules can be cleaned, and there are many places to pay attention to when cleaning. The following article describes some precautions for cleaning PV modules.Steel Profile Suppliers

1. In order to avoid the electric shock damage to the human body and the damage to the components under high temperature and strong illumination, the staff usually choose to clean the components in the morning or late in the afternoon.

some precautions for cleaning PV modules

2. It is strictly forbidden to wipe the PV module with hard and sharp tools or corrosive solvents and alkaline organic solvents. It is forbidden to spray the cleaning water to the component junction box, cable tray, combiner box and other equipment. The impact pressure of the cleaning equipment on the components during cleaning must be controlled within a certain range to avoid cracking that is not caused by force.

3. When cleaning personnel, it is forbidden to stand at a position less than 1 meter from the edge of the roof. Do not throw tools and debris down and take them away after the job is completed.

4. Before cleaning the components, check whether there is any abnormality in the output of the monitoring records. Analyze whether it is possible to cause leakage due to leakage. Check the connection wires and related components of the components for damage and adhesion. The test pencil tests the aluminum frame, bracket, and tempered glass surface of the assembly. In order to eliminate potential leakage, to ensure personal safety.

5. The photovoltaic module aluminum frame and photovoltaic support have many sharp corners. Therefore, personnel who perform component cleaning should wear appropriate overalls and wear hats to avoid injury and injury. Hooks and straps on clothing or tools should be prohibited. A part that is easily caused by a thread.

6. It is forbidden to step on PV modules such as PV modules, rail brackets, cable trays or other means to leverage component boards and brackets.

7. It is strictly forbidden to clean the PV modules under meteorological conditions such as heavy wind, heavy rain, thunderstorm or heavy snow. Winter cleaning should be avoided to prevent the temperature from falling too low and freezing, causing dirt to accumulate; for the same reason, do not rinse with cold water when the panel is very hot.Steel Profile Manufacturers

Finally, users are not advised to clean themselves without knowing the relevant professional cleaning knowledge. It is best to have professional PV cleaning personnel to carry out cleaning and maintenance, in order to better ensure that the PV modules are not damaged during the cleaning process.

The problem of photovoltaic supports

There are many loads on the basis of photovoltaic supports, including the self-weight, wind load, snow load, temperature load and seismic load of the support and PV modules. The main control function is the wind load, so the photovoltaic support foundation design should ensure the stability of the foundation under the wind load.

The problem of photovoltaic supports

The photovoltaic support base can be easily divided into two types: ground photovoltaic support foundation and flat roof photovoltaic support foundation, but it can be subdivided into many small categories. For example, in the ground photovoltaic support foundation, there are bored pile foundation, steel spiral foundation, independent foundation, reinforced concrete strip foundation, precast pile foundation and so on.steel l Profile Supplier

It is convenient to form the hole of the bored pile of the photovoltaic support, and the elevation of the top surface of the foundation can be adjusted according to the terrain, indicating that the top mark is easy to control. Moreover, the amount of concrete reinforcement is small, the amount of excavation is small, the construction is fast, and the original vegetation is less damaged, but it is not suitable for use in loose sandy soil layers.

The top elevation of the steel spiral foundation is not affected by groundwater, even if it is constructed as usual under winter weather conditions, the construction is fast. It is screwed into the soil by special machinery, and the vegetation in the field can be protected as much as possible without the need for site leveling. The screw pile can be used twice.

If the photovoltaic support adopts an independent foundation, it will have superior water load resistance and flood resistance and wind resistance. However, due to its long construction period and great environmental damage, it is rarely used in actual photovoltaic projects. Basically. For the flat roof photovoltaic support, there are two main foundations, one is the cement weight method, and the other is the precast cement weight, which also has its own advantages and disadvantages.

What are the main raw materials for PV modules

What are the main raw materials for PV modules? The structure of the solar cell module and the functions of each part:

1) Tempered glass

Its role is to protect the main body of power generation (such as battery sheets), the choice of light transmission is required: 1 light transmittance must be high (generally 91% or more); 2 ultra-white steel treatment.c profile steel suppliers

What are the main raw materials for PV modules

2) Battery chip

The main role is to generate electricity. The mainstream of the main power generation market is crystalline silicon solar cells and thin film solar cells. Both have superior and inferior crystalline silicon solar cells. The equipment cost is relatively low, but the cost of consumption and cell is high. However, the photoelectric conversion efficiency is also high. It is more suitable for thin-film solar cells in outdoor sunlight. The relative equipment cost is high, but the consumption and battery cost are very low, but the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, but the weak light effect is very Well, photovoltaic modules can also generate electricity under ordinary lighting, such as solar cells on a calculator.

3) Junction box

Protect the entire power generation system and act as a current transfer station. If the short-circuit junction box automatically disconnects the short-circuit battery string, the most critical factor in preventing the burnout of the entire system junction box is the choice of diodes. Depending on the type of battery in the module, The corresponding diodes are also different.

4) Silicone

Sealing function, used to seal components and aluminum alloy frame, components and junction box junctions Some companies use double-sided tape, foam to replace silica gel, silicone is commonly used in China, the process is simple, convenient, easy to operate, and the cost is very low.

5) Backplane

Function, sealing, insulation, waterproof (usually TPT, TPE and other materials must be resistant to aging, most components manufacturers are guaranteed for 25 years, tempered glass, aluminum alloy is generally no problem, the key is whether with the backboard and silica gel Meet the requirements).z profile steel

6) Aluminum alloy

The laminate is protected to provide a certain sealing and supporting function.

7) EVA

Used to bond fixed tempered glass and power generation main body (such as battery sheet), the quality of transparent EVA material directly affects the life of the component. EVA exposed to air is prone to aging and yellowing, thus affecting the transmittance of the component and thus affecting In addition to the quality of the EVA itself, the component manufacturer’s lamination process is also very large. If the EVA glue is not up to standard, the adhesion strength of EVA and tempered glass and back sheet will not cause premature aging of EVA. Component life.

8) EVA acts as above, mainly bonding and encapsulating the power generating body and the backboard.

Nearly 1,000 companies from the US solar industry supply chain sent a letter to Congress

Nearly 1,000 companies from the US solar industry supply chain sent a letter to Congress requesting an extension of Articles 48 and 25D Solar Investment Tax Credit (ITC).l profile steel manufacturer

The Solar Energy Industry Association (SEIA) is leading a national alliance to expand ITC, one of the most successful clean energy tax policies of all time. The International Trade Commission was passed by the Republican-controlled Congress in the 2005 Energy Policy Act and was issued by George W. Bush. It received support from both parties in 2015.

Nearly 1,000 companies from the US solar industry supply chain sent a letter to Congress

Since then, the vast majority of Americans on both sides have concluded in a number of opinion polls that they hope to develop policies to address climate change. ITC provided an opportunity for both legislators to take initial and meaningful steps to reduce US greenhouse gas emissions.

Abigail Ross Hopper, SEIA’s President and CEO, said: “If you want to demonstrate a commitment to climate change, then you can expand solar ITC.” “Supporting this proven policy is the legislator The first obvious victory for Americans on climate change issues. When we discuss long-term solutions, it is time to abandon the most successful policy of deploying clean energy in the near future.”

ITC, which is scheduled to begin to downgrade at the end of 2019, has a successful track record. Since its initial adoption, ITC has created more than 200,000 US jobs, increased $140 billion in private sector investment and increased 10,000% in solar deployments. Therefore, solar energy reduces emissions every year. Since 2015, solar installations have doubled, and now there are more than 2 million installations in all 50 states.

Sunn co-founder and CEO Lynn Jurich said, “Nearly 1,000 solar companies, regardless of size, support ITC expansion as it continues to create hundreds of thousands of jobs, is driving innovation and expanding Americans’ solar access. “Sunrun is an example of how smart policies like ITC work, employing more than 4,000 employees nationwide, installing solar energy in more than 240,000 homes, and innovating new technologies that benefit all energy consumers. service.”

The letter was signed by companies working in the red, blue and purple-purple, purple and purple regions of each state and is the beginning of a multi-pronged advocacy campaign led by SEIA and its partners.steel c profile manufacturers

“The ITC expansion will help maintain a stable market for sustainable solar energy development in the utility sector,” said George Hershman, president of Swinerton Renewable Energy. “This translates directly into investment in rural communities in our country, by providing more employment opportunities in the solar value chain, providing long-term energy solutions to taxpayers at lower cost, and increasing state and local tax bases. Solar ITC is a worker , taxpayers and the future of American energy.”

The National Alliance is expected to invest heavily in lobbying, advertising, media campaigns, and social media. The alliance will call on legislators to protect 242,000 workers and 10,000 businesses in the solar industry.

Protection principle of the galvanized protective layer of steel pipe

Hot-dip galvanized steel pipes are widely used in construction, machinery, coal, chemical, railway vehicles, automobile industry, roads, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, mining machinery and other manufacturing industries. The surface of the galvanized steel pipe is welded with hot dip or galvanized steel. Galvanized Steel Coil Manufacturer

Protection principle of the galvanized protective layer of steel pipe

Zinc plating can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized pipes are widely used, in addition to pipelines for general low-pressure fluids such as water, gas, oil, etc., and also used as oil well pipes and oil pipes in the petroleum industry, especially in offshore oil fields, and oil heaters and condensation of chemical coking equipment. Cooler, coal distillate oil exchanger pipe, and trestle pipe pile, support pipe for mine tunnel, etc. This article will explains the protection principle of the galvanized protective layer of hot-dip galvanized steel pipe.

The reason why the steel pipe is hot-dip galvanized is because zinc can form a corrosion-resistant film on the surface in a corrosive environment. It not only protects the zinc layer itself, but also protects the steel base, but its service life and its environment This can be confirmed by an atmospheric corrosion test on hot-dip galvanized steel pipes.

Hot-dip galvanized steel pipes have different corrosion rates in different environments. Theoretically, this corrosion can be divided into two different ways, namely chemical corrosion and electrochemical corrosion.

Chemical Corrosion: The direct chemical action of the metal with the surrounding medium, such as dry (absolutely no moisture) gas and non-conductive liquid medium (non-electrolyte), the chemical action on zinc is called typical chemical corrosion.

Electrochemical corrosion refers to the corrosion of metals in humid gases and in conductive liquid media (electrolytes) due to the flow of electrons. For example, corrosion of zinc in acids, bases, salt solutions and seawater, and atmospheric corrosion of zinc in humid air are all electrochemical corrosion.steel coil manufacturers

The electrolyte is formed when moisture in the air accumulates in the pits on the surface of the galvanized sheet, and carbon dioxide, sulfur dioxide or other corrosive medium in the air dissolves in the water.