1. Product Innovations: From New Launches to Patented Technologies

1.1 Lightweight Aluminum Rail: MayWon Solar Launches Wise Rail

In 2024, MayWon Solar introduced an innovative lightweight aluminum rail called Wise Rail, suitable for residential, commercial, and rural energy systems. Combining advanced materials, rigorous testing, and intelligent structural design, the rail offers higher strength, lower weight, and enhanced durability under extreme weather conditions, while reducing roof load and improving installation efficiency.

1.2 AWM Launches SUMAC Rail: A Disruptive Aluminum‑Replacing‑Steel Design

In September 2024, US cable management supplier AWM unveiled three new utility‑grade products at the RE+ Clean Energy conference, the most notable being the SUMAC Rail. This aluminum rail is designed for short‑distance, precision‑cable‑routing applications, replacing traditional cable trays, cable ties, and clips. Its core features include:

“Zero sag” design: A sag‑free alternative for overhead cables, specifically for short‑span precision routing

No end posts required: Significantly reduces pile count and steel costs

Multi‑function integration: Replaces traditional cable trays, ties, and clips while accommodating additional loads, eliminating the need for extra piles around disconnect clusters and drive lines

Uniform ampacity: Creates a uniform cable arrangement across the site, ensuring consistent ampacity

The CEO of AWM stated: “SUMAC Rail sets an industry‑leading standard for safety, reliability, and usability.”

1.3 Large‑Module Compatibility: DCE Solar Launches Long Span S7 System

In August 2024, DCE Solar introduced the Long Span S7 mounting system, specifically designed for First Solar’s Series 7 large‑format modules. By integrating a unique rail and wedge mounting system, it enables easy installation while supporting Series 7 proprietary technology. Bill Taylor, founder of DCE Solar, said: “The Long Span system combined with the Series 7 module sets a new standard for efficiency and performance in commercial solar projects.” The system made its debut at the RE+ exhibition in September 2024.

1.4 Railway Solar Rails: Breakthrough in Application Scenarios

In 2024, rail systems achieved a breakthrough in railway applications. Swiss start‑up Sun‑Ways received approval from the Swiss Federal Office of Transport to deploy a 100‑meter removable PV system on the 221 railway line segment operated by TransN in Neuchâtel. The system is equipped with 48 solar panels of 385 W each, with an expected annual generation of 16 MWh. The system includes a dedicated installation machine capable of installing up to 1,000 m² of solar panels per day, and the removable design facilitates maintenance. Italian company Greenrail Group has been testing photovoltaic sleepers, confirming the robustness and effectiveness of its solar sleeper solution. Chinese company Das Intellitech also obtained a patent for a “solar power generation device and solar energy storage conversion system”, which installs solar panels on railway rails.

1.5 Surge in Domestic Chinese Patent Innovations

In 2024, several Chinese companies obtained utility model patents in the rail sector:

Guangdong Huaxun Construction Engineering obtained a patent in November 2024 for a “Guide rail bracket for PV module installation” (Authorization No. CN 222016439 U). The design uses a connection slot with a support rail, a fixed locking hook that engages with a limit slot for quick installation, and an interlocking plate for reinforcement. Only one fastening nut is needed for full installation and tightening, significantly improving installation efficiency on corrugated steel roofs.

Fujian Kseng New Energy‘s “Horizontal PV mounting rail structure” patent (Publication No. CN223157006U) was filed in September 2024. It features a U‑shaped open slot design with a reinforcing plate on the top. The rail protrusions and overlapping edges allow PV panels to be laid longitudinally on both sides of the rail body, offering simple structure, high precision, corrosion resistance, and easy installation.

Xinwei Aluminum obtained a patent in December 2024 for a “Track‑type solar alloy mount” (Authorization No. CN 222127989 U), enabling on‑demand adjustment of the solar support angle or height through a coordinated arrangement of moving tracks, slide grooves, lifting main rods, and auxiliary rods.

Suzhou Tianhan Optoelectronics obtained a patent in November 2024 for a “Custom aluminum alloy bracket for single saddle plate”, which uses corner aluminum connections to reduce profile consumption and allows adjustment of the fixing base position according to site conditions, balancing stability and material savings.

2. Material Technology: Continuous Evolution of Aluminum Alloys and High‑Performance Materials

2.1 New Breakthroughs in Aluminum Alloy Materials

In 2024, aluminum alloy – the mainstream material for PV rails – achieved continuous performance breakthroughs:

Baosteel‘s “Sun Chaser” series debuted at SNEC 2024, using Danxia steel as the core material to drive green innovation in PV power generation. In May 2024, monthly orders exceeded 12,000 tonnes. As of June 2024, Danxia steel had been supplied for more than 45,000 tonnes and used in 1.5 GW of PV projects.

Shangang Group successfully developed and rolled out a new steel product for PV mounting structures, with all indicators meeting customer requirements.

2.2 Zn‑Al‑Mg Coated Steel Adoption Accelerates

In 2024, the application of zinc‑aluminium‑magnesium (Zn‑Al‑Mg) coated steel in the rail sector expanded further. The material offers self‑healing properties at cut edges, corrosion resistance 5‑10 times better than traditional hot‑dip galvanizing, and a service life extended to over 35 years. In large projects such as coastal tidal flats and high‑humidity agricultural areas, rail systems using Zn‑Al‑Mg coated steel are rapidly replacing conventional hot‑dip galvanized solutions.

2.3 Material Capacity Expansion

In December 2024, Inner Mongolia Weike Aluminium‑Matrix‘s PV frames were launched, filling a gap in the aluminium‑matrix material industry for PV modules in Baotou. During the year, a 200,000‑tonne green lightweight high‑end aluminium‑matrix deep‑processing project was completed and trial‑produced, and construction began on the second phase with an annual capacity of “200,000 tonnes of aluminium‑matrix PV frames”.

3. Installation Efficiency: Rail‑Based vs. Rail‑Less Systems

In 2024, the technical comparison between rail‑based and rail‑less systems became a focus of industry attention. Both systems have their advantages:

As the most traditional mounting method, rail‑based systems continue to improve. Today‘s innovative manufacturers are offering hardware that is lighter, stronger, and easier to install.

4. Standards and Certifications: Quality Thresholds Continue to Rise

In 2024, the standards and certification system for PV rails was further refined:

UL certification: In the US, UL certification is an important product quality mark, requiring manufacturers to strictly manage product design, production, and testing to ensure compliance and stable quality. UL is the only certification body qualified to issue both UL and CB certificates for PV products.

Domestic standards: T/UNP 193‑2024 “General technical specification for PV mounts” was released and came into effect on 20 December 2024, providing a unified technical basis for the design, manufacture, and inspection of rails and other mounting components.

Local specifications: Beijing, Ningbo and other localities also issued regional technical specifications such as “Installation and acceptance procedures for building PV systems”, providing more concrete guidance for project implementation.

5. Application Expansion: Innovative Uses of Rails in Special Scenarios

In 2024, the application scenarios of rail systems expanded beyond traditional rooftop and ground‑mount plants to more diverse areas:

Railway scenarios: As mentioned, Sun‑Ways and Greenrail applied rail systems to railway tracks, using existing infrastructure for PV installation without occupying additional natural ecological land, greatly improving space utilisation efficiency. A UK study showed that using railway tracks for solar could meet up to 8% of the UK‘s total electricity demand.

Flexible module installation: In 2024, a patent breakthrough was achieved for rail mounting components for flexible PV modules. The mounting component includes a rail section, with the lower side connected to the mounting surface via clamps and the upper side used to install flexible PV modules, solving the installation difficulties of flexible modules.

6. Company Developments: Global Expansion and Capacity Growth

6.1 K2 Systems Moves Rail Production to the US

In June 2024, K2 Systems announced that it would move production of two of its solar accessories – the CrossRail rail‑based system and the MiniRail Comp system – to the United States to comply with the domestic content requirements of the Inflation Reduction Act. The CrossRail system is a rail‑based mounting system suitable for various roof types (composition shingles, tiles, metal), with pre‑assembled universal connection clamps. The MiniRail Comp system is a 5‑inch solar bracket specifically designed for composition shingle roofs, with a partial rail that attaches to the roof using four self‑tapping screws and an integrated flashing, supporting both portrait and landscape layouts. The move aims to help customers qualify for tax credits while promoting US manufacturing.

6.2 Chinese Companies Accelerate Overseas Expansion

In 2024, Chinese PV mounting companies such as Arctech, TrinaTracker, and Antai New Energy significantly increased their global tracker market share, driving the global supply of associated rail products. Arctech has established production bases in the US, Saudi Arabia, and Brazil, while TrinaTracker has set up a 3 GW smart tracker manufacturing facility in Saudi Arabia.

7. Industry Trend Summary

In 2024, the solar module rail system exhibited the following technology trends:

8. Future Outlook

Looking ahead to 2025 and beyond, the solar module rail system will continue to evolve in the following directions:

Ultra‑lightweight: The application of high‑strength aluminium alloys and Zn‑Al‑Mg coated materials will further reduce rail wall thickness, reducing material consumption by 15‑25% under the same load.

Integrated design: Rails will be deeply integrated with grounding, cable management, drainage and other functions, reducing on‑site installation steps. The concept of integrating rails with cable management, as seen in AWM‘s SUMAC Rail, will be more widely adopted.

Intelligent adaptation: As AI‑powered intelligent tracking systems become more common, rail systems will be deeply integrated with tracking algorithms to achieve more precise module positioning and angle control.

Diversified applications: Emerging scenarios such as railway track PV, BIPV, and flexible modules will generate more specialised rail products.

Global supply chain restructuring: Driven by policies such as the IRA, the regionalisation of PV rail production will accelerate, with new localised capacity added in North America, Europe, the Middle East and other regions.

Standardisation harmonisation: International standards such as UL 2703 and IEC 62817 will increasingly align with domestic standards such as T/UNP 193‑2024, providing a unified technical basis for the global circulation of rail products.

The solar module rail system – the “backbone” of PV mounting – is evolving from a simple load‑bearing structure into an integrated, intelligent, lightweight comprehensive solution, providing solid support for cost reduction, efficiency improvement, and scenario expansion of PV power plants.