I. Industry Overview: The Solar Mounting Rail Market Accelerates Expansion

In 2024, the global solar photovoltaic mounting system market reached a critical growth inflection point. According to industry research data, the global solar PV mounting system market was valued at US$22.79 billion in 2024, is projected to reach US$23.61 billion in 2025, and will grow to US$31.33 billion by 2033, with a compound annual growth rate (CAGR) of 3.6%. As a fundamental structural component for fixing and supporting PV modules, the mounting rail market has similarly demonstrated strong growth. In 2024, the global solar mounting rail market reached US$2.461 billion, with annual production of approximately 439,400 kilometers. Growing at a CAGR of 6.1%, it is expected to reach US$3.789 billion by 2031.

From an application perspective, solar mounting rails are widely used in rooftop, ground-mount, and tracking system scenarios. Mainstream products use anodized aluminum 6005-T5 or galvanized steel, emphasizing lightweight design, wind uplift resistance, and grounding continuity. With the explosive growth of distributed PV, the market has placed higher demands on rail systems for snow load resistance, seismic performance, and aesthetic integration.

II. Policy Tailwinds: Strongly Boosting the Mounting Rail Market Expansion

In 2024, a series of major policies were intensively issued at both national and local levels, injecting strong momentum into the solar PV mounting rail market. In September 2024, the Ministry of Industry and Information Technology (MIIT) issued the Guidelines for the Construction of the PV Industry Standard System (2024 Edition), explicitly stating that more than 60 new national and industry standards will be developed by 2026, with PV component standards covering key aspects such as support structures and components, promoting industry standardization.

In March 2024, Anhui Province issued the Implementation Plan for Pilot Demonstration and Promotion of Building-Integrated Photovoltaics (BIPV) in Anhui Province, clearly stating that the province's BIPV installed capacity will maintain an average annual growth rate of over 50%, aiming to reach an accumulated installed capacity of more than 400 MW by 2027, opening new space for the application of PV mounting rails in BIPV scenarios. At the end of 2024, Ningbo City issued the *Three-Year Action Plan (2025-2027) for Promoting High-Level Rooftop PV Construction in the Building Sector*, requiring that the PV coverage rate for new buildings remain steadily above 98%, with a new rooftop PV installed capacity of 4 GW by 2027.

Additionally, six departments including the National Development and Reform Commission (NDRC) issued the Guiding Opinions on Vigorously Promoting the Substitution of Renewable Energy, explicitly promoting the addition of PV systems to existing buildings, and requiring that new factories and public buildings have PV systems installed wherever possible. These policies have formed strong driving forces from both top-level design and local implementation, further enhancing the deterministic demand for PV mounting rails as the fundamental load-bearing component of PV systems.

III. Five Major Technological Innovation Trends in 2024

Trend 1: Rail-Less Installation Technology Disrupts Tradition

In 2024, rail-less installation technology achieved significant breakthroughs. Traditional PV products require heavy rails to resist wind pressure, complex sealing processes to prevent corrosion and rust, and dozens of spare parts to adapt to various roof types. LONGi's rail-less solution, launched in 2024, completely eliminates rail installation and most bolted connections, increasing installation speed by 25% and significantly simplifying the construction process. GoodWe's "Full-Scenario Lightweight Module Solution" also supports both rail-based and rail-less installation methods, with rail-less installation using clamp fixing and compatibility with standard accessory systems. Rail-less technology not only reduces material costs but also significantly shortens construction periods, becoming a standard solution in the commercial metal roof market.

Trend 2: H-Section Rail Connectors Optimize Load Transfer Paths

Aluminum alloy H-section rail connectors received widespread attention in 2024. Traditional PV brackets rely heavily on U-clamps or angle-splicing connections, which depend on installer experience and have ambiguous load transfer paths. In contrast, H-section rails, through precise extrusion profiles, standardize the load transfer path between solar modules and metal sheet roofs. Their geometric symmetry naturally creates a dual-channel structure for bending and torsion resistance. With the same material thickness, the moment of inertia of an H-section is more than 40% higher than that of traditional clamps, reducing system displacement by 30% and significantly decreasing the probability of micro-cracks in modules. In humid coastal areas, this design extends bracket life from 5 to 15 years, effectively saving the cost of two system rebuilds.

Trend 3: Increasing Penetration of Tracking Systems

Tracking systems can increase power generation efficiency by 15%-40% compared to fixed-tilt systems, offering particularly significant advantages in large-scale ground-mounted power plants. In 2024, the global PV tracking system market was approximately RMB 316.31 billion (approx. US$43.7 billion). The Chinese PV tracking system market reached RMB 23.959 billion (approx. US$3.31 billion), a year-on-year increase of 20.48%. Global tracking system shipments have exceeded 80 GW by 2025, with AI algorithms combined with Beidou positioning improving tracking accuracy to ±1°, delivering power generation gains of 15%-25%. With the advancement of grid parity and intelligent management, the penetration rate of tracking systems is expected to continue increasing, becoming an important means of reducing LCOE.

Trend 4: Modular and Prefabricated Design Improves Installation Efficiency

PV mounting systems are shifting from "on-site cutting and welding" to "factory prefabrication + on-site assembly". Modular design can shorten construction periods by 30% and significantly improve quality consistency. Standardized, modular mounting systems not only increase installation speed and reduce on-site labor but also significantly lower balance-of-system (BOS) costs and improve overall project predictability. As global PV installed capacity continues to expand and project timelines become increasingly compressed, this trend will further accelerate.

Trend 5: Smart Rails Enable Structural Health Monitoring

In the future, solar mounting rails will evolve toward intelligence. Smart rails integrated with temperature and strain sensors can monitor structural health in real-time. This innovation upgrades rails from passive support components to the intelligent mounting ecosystem cornerstone for safe, efficient, and aesthetically pleasing PV deployment. Meanwhile, on the materials front, the application of high-corrosion-resistance magnesium alloys or recycled aluminum will further enhance rail sustainability and full-lifecycle value.

IV. Mainstream Materials and Selection Comparison

The mainstream materials for solar mounting rails primarily include anodized aluminum alloy, hot-dip galvanized steel, and emerging zinc-aluminum-magnesium (Zn-Al-Mg) coated steel. Aluminum alloy rails (e.g., 6063-T5) have an anodized film thickness ≥12μm and are 30% lighter than steel rails of the same specifications, making them particularly suitable for load-limited scenarios such as commercial and industrial roofs and metal sheet roofs. Hot-dip galvanized steel brackets (Q355B) with a zinc coating thickness ≥85μm and salt spray resistance exceeding 1,000 hours are suitable for heavy-load scenarios such as centralized ground-mounted power plants and mountain PV. Zn-Al-Mg coated brackets can achieve salt spray resistance of up to 1,200 hours, with corrosion resistance 3-10 times higher than conventional hot-dip galvanized products, excelling in highly corrosive coastal areas.

Material selection should be matched to specific scenarios: centralized ground-mounted plants prioritize hot-dip galvanized steel brackets for load-bearing capacity and weather resistance; commercial and industrial rooftop PV should use lightweight aluminum alloy brackets to reduce roof load; coastal projects should prioritize Zn-Al-Mg coated brackets or aluminum alloy brackets for enhanced corrosion protection.

V. Leading Companies and Representative Products

LONGi

In March 2024, LONGi officially launched the LONGi Hi‑ROOF E metal roof PV solution. Equipped with HPBC 2.0 high-efficiency cells and using high-strength steel frames with Zn-Al-Mg coating, the structural strength is significantly improved compared to traditional aluminum frames, with load deformation reduced by two-thirds and negative pressure load capacity reaching -3600 Pa. The solution completely eliminates rail installation, using only four types of integrated clamps to adapt to 80% of metal roof types on the market, increasing installation speed by 25%, bringing a systemic breakthrough to the commercial and industrial PV market.

Clenergy

Clenergy focuses on lightweight PV brackets. Its aluminum alloy rails use 6063-T5 material with an anodized film thickness ≥12μm, and are 30% lighter than steel rails of the same specifications, suitable for load-limited scenarios such as commercial and industrial roofs and metal roofs. Its flexible PV brackets use a tensioned structure, adaptable to complex terrain and curved roofs, increasing module packing density by 15%.

Dongqi New Energy

Dongqi New Energy's Zn-Al-Mg coated brackets have salt spray resistance up to 1,200 hours, superior to conventional hot-dip galvanized products, suitable for highly corrosive coastal areas. Its PV-storage-charging integrated carport system integrates PV, energy storage, and EV charging, reducing construction periods by an average of 20% compared to industry standards.

Arctech

Arctech's core load-bearing components use hot-dip galvanized Q355B steel with a zinc coating thickness ≥85μm, passing salt spray tests exceeding 1,000 hours. Its single-axis tracking brackets are equipped with high-precision sun sensors, achieving tracking accuracy of ±0.5° and increasing power generation by about 22% compared to fixed-tilt systems, suitable for heavy-load scenarios such as centralized ground-mounted plants and mountain PV.

Sun-Ways (Switzerland)

In October 2024, Swiss startup Sun-Ways' railway PV project received approval from the Swiss Federal Transport Office and was officially connected to the grid in April 2025. The system installs