How to Choose the solar structure/bracket/mounting/rack system by projects

1. Understanding the bracket

If a worker wants to do his job well, he must first sharpen his tools. Before the operation and maintenance of the photovoltaic bracket, we need to know and understand the material and structure of the photovoltaic bracket, so that we can better perform the operation and maintenance work.

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1.1 Ordinary steel bracket

At present, steel brackets generally use hot-dip galvanized steel, which is often called galvanized brackets. This type of bracket is widely used and is one of the most common types of brackets. This type of bracket has high mechanical strength, simple structure, and can withstand natural conditions such as strong winds. It is generally used in photovoltaic power stations with strong strength requirements in areas with strong winds and relatively large spans. In addition, this type of bracket has the disadvantages of heavy weight, poor anti-corrosion ability, and requires anti-corrosion maintenance for later use.

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1.2. Aluminum alloy bracket

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Anodizing is generally used. Aluminum can form a protective film in the air, and generally does not require anti-corrosion maintenance in the future. The weight of aluminum alloy is much lighter than that of steel brackets, which also makes it the best choice for rooftop photovoltaics. However, photovoltaic brackets made of aluminum alloy have low strength and are prone to deformation, which reduces the power generation efficiency of photovoltaic modules.

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1.3. Flexible bracket

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The flexible bracket uses a steel cable prestressed structure to solve the technical problem that the traditional bracket structure cannot be installed due to the limitation of span and height. Flexible photovoltaic brackets have wide applicability and flexibility and are widely used in mountainous areas, roofs with low load-bearing capacity, and forest-solar complementary and fishery-solar complementary power stations.

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1.4. Plastic bracket

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Plastic photovoltaic brackets are made of high-strength plastic material and have the advantages of lightness, corrosion resistance and insulation. Compared with traditional metal brackets, plastic brackets not only reduce the weight of the bracket and reduce installation costs, but are also environmentally friendly and recyclable. In addition, the design of the plastic bracket is flexible and can be customized according to different needs. It is widely used in photovoltaic power stations, rooftops, deserts and other scenarios.

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2. Analysis and treatment of potential safety hazards of photovoltaic brackets

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2.1. The photovoltaic field area was flooded. The pile foundations on site were washed away by rainwater, resulting in serious water and soil loss. The pile foundations were exposed and sunk, and the bearing layer was damaged.

Causes: There is a lack of flood interception trenches and drainage systems, and the soil and water conservation plan has not been implemented.

cause impact: The sinking of the pile foundation may cause the bracket to deform and produce stress on the components, causing the components to explode, seriously affecting the safe operation of the power station.

Rectification opinions: Implement the soil and water conservation plan and add flood interception ditches and drainage ditches.

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2.2. On-site pile foundations vary in size.

Causes: During the construction process, the construction was not carried out according to the design requirements, and there were situations where corners were cut and materials were cut.

cause impact: Photovoltaic power stations have poor wind and pressure resistance, resulting in the risk of the power station being blown down and collapsed.

Rectification opinions: Increase the volume and weight of prefabricated blocks, and enhance the stability and wind and pressure resistance of the component array.

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2.3. The on-site pile foundation and embedded parts did not meet the design requirements, and the support base was not fastened in place.

Causes: During the construction process, the pile foundation was not constructed according to the design requirements.

cause impact: Affects the stability and safety of component brackets.

Rectification opinions: Reinforce the support base to ensure that the service life of the power station is not affected.

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2.4. The on-site bracket material code and galvanized layer are not up to standard.

Causes: During the construction process, the support materials were not used according to the design requirements.

cause impact: Affects the safety, stability and operational durability of the power station.

Rectification opinions: Track the corrosion problems of bracket materials during operation and maintenance, promptly repair and anti-corrosion treatment of corroded parts or replace bracket materials whose galvanized layer does not meet the standard.

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2.5. The purlins on site are severely corroded

Causes: Material management is not in place or material procurement is unqualified during the construction process.

cause impact: Affects the safety, stability and operational durability of the power station.

Rectification opinions: Carry out secondary anti-corrosion treatment on the rusted parts of the bracket and purlin to ensure the durability of the bracket.

3. Maintenance of photovoltaic brackets

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3.1.Maintenance requirements:

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1. The screws and fastening bolts of photovoltaic brackets must be wiped and tightened regularly.

2. Photovoltaic supports should not be painted with silver paint or anti-rust paint regularly.

3. Direct foundation reinforcement and weathering repair.

4. The cable-stayed braces should be fastened regularly.

5. New type of repair and anti-corrosion for mechanically damaged stents.

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3.2.Key points for regular inspection of photovoltaic array brackets:

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1. The photovoltaic array as a whole should not be deformed, dislocated, loose, etc.

2. The planting bars or rear-mounted double-barrels used to fix the photovoltaic room exhibition should not be loose. The photovoltaic array should be installed on a prefabricated base. The prefabricated base should be placed stably and neatly, and the position should not be moved.

3. The main components, connection components and connecting bolts of the photovoltaic array should not be damaged or loose, the welds should not be open, and the anti-rust layer of the metal material should be intact and there should be no peeling or corrosion.

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3.3.Mechanical strength test method of stent:

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Apply a force of 250N to the most unfavorable position and direction of the photovoltaic array bracket and photovoltaic module frame for 10 seconds. After five consecutive tests, the array must not be loose, permanently deformed, cracked or otherwise damaged.