Advantages of solar pv aluminum structure

With the vigorous development of new energy, our photovoltaic industry is also booming. Then photovoltaic power plants will use many supporting materials, such as photovoltaic frames, photovoltaic brackets, etc. Aluminum alloy frames and brackets now occupy most of the market. Why are aluminum profiles so popular? Today we will analyze its advantages.

(1) Appearance:

Aluminum alloy profiles have many surface treatment methods, such as anodizing, chemical polishing, fluorocarbon spraying, electrophoretic painting, etc. The appearance is beautiful and can adapt to various environments with strong corrosion.

Steel is generally used in hot-dip galvanizing, surface spraying, paint coating, etc., its appearance is inferior to aluminum alloy profiles, and it is also inferior to aluminum profiles in terms of corrosion protection.

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(2) Cross-sectional diversity

Aluminum alloy profiles are generally processed by extrusion, casting, bending, stamping, etc. Extrusion production is currently the mainstream production method. By opening an extrusion die, any arbitrary cross-section profile can be produced, and the production speed is relatively fast .

Steel is generally rolled, cast, bent, stamped, etc. Rolling is currently the mainstream production method for producing cold-formed steel. The cross-section needs to be adjusted by the roller pressing wheel, but the general machine can only produce similar products after setting, the size can be adjusted, and the cross-sectional shape cannot be changed, such as C-shaped steel, Z-shaped steel and other cross-sections. The rolling production method is relatively fixed, and the production speed is relatively fast.

Material recycling

The maintenance cost of the steel structure increases by 3% every year, and the aluminum structure brackets hardly require any maintenance and maintenance, and the aluminum material still has a recovery rate of 65% after 30 years. After 30 years, it is basically a pile of scrap iron with no recycling value.

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Comprehensive performance comparison

(1) Aluminum alloy profiles are light in weight, beautiful in appearance, and excellent in anti-corrosion performance, and are generally used in home roof power stations that have requirements on load-bearing and strong corrosion environments.

(2) The steel has high strength and small deflection deformation under load. It is generally used in ordinary power stations or components with relatively large stress.

(3) Cost: In general, the basic wind pressure is 0.6kN / m2 and the span is less than 2m. The cost of the aluminum alloy bracket is 1.3-1.5 times that of the steel structure. In a small span system, (such as color steel roof) The cost difference between the aluminum alloy bracket and the steel structure bracket is relatively small, and the aluminum alloy is much lighter than the steel bracket in terms of weight, so it is very suitable for home roof power stations.

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Anti-corrosion

At present, the main anti-corrosion method of the support steel is hot dip galvanized 55-80μm, and the aluminum alloy is anodized 5-10μm.

Aluminum alloy is in the passivation zone in the atmospheric environment, and a dense oxide film is formed on the surface, which prevents the surface of the active aluminum substrate from contacting with the surrounding atmosphere, so it has very good corrosion resistance and the corrosion rate increases with time. While decreasing. Steel under normal conditions (C1-C4 environment), 80μm galvanized thickness can guarantee more than 20 years of use, but in high-humidity industrial areas or high-salinity seashores or even temperate seawater corrosion rate is accelerated, galvanized amount needs 100μm Above and need regular maintenance every year.

Editor: Kiko Lee

E-mail: kiko@wanhos.com