I. Market Overview: Global Solar Clamp Market Enters Rapid Growth Phase

According to the International Energy Agency (IEA), global solar power capacity reached approximately 1,000 GW in 2022, with solar power accounting for about 10% of total global electricity generation. The rapid growth of solar facilities directly drove market demand for supporting components such as clamps.

By sub‑segment, the End Clamp Kit market was valued at approximately USD 1.2 billion in 2022 and is expected to reach USD 2.1 billion by 2030, with a compound annual growth rate (CAGR) of approximately 7.9% from 2024 to 2030. The metal roof mounting systems market was valued at about USD 2.5 billion in 2022 and is projected to reach USD 4.0 billion by 2030, with a CAGR of about 7.5%. In the PV mounting bracket sector, the global market size was approximately USD 790 million in 2022, expected to grow to USD 1.59 billion by 2029, with a CAGR of about 8.4% from 2023 to 2029.

The core drivers of market growth came from a dual push of policies and technology. On April 1, 2022, China’s Ministry of Housing and Urban‑Rural Development officially implemented the General Code for Building Energy Efficiency and Renewable Energy Utilization, mandating that new buildings install solar PV systems, with PV modules designed for a service life of more than 25 years, and building carbon emission intensity reduced by an average of 40% compared to 2016 standards. This mandatory policy shifted BIPV (Building‑Integrated Photovoltaics) from “advocacy” to “mandatory”, providing sustained market space for the clamp industry.

II. Technological Innovation: Breakthroughs in Metal Roof Clamp Products in 2022

In 2022, significant results were achieved in R&D and product innovation for metal roof solar clamps.

Global Benchmark: S-5! Announces 14 New Patents in a Single Year

S-5!, a leading global company in metal roof attachments, announced that in 2022 alone it was granted 14 new patents, bringing its total since its first product patent in 1991 to 112 patents. Among them, U.S. Patent No. 11,512,474 covers the S-5-ZH™ Mini Clamp, designed for round “bulb” seam profiles, compatible with major metal roof profiles such as BEMO, Kalzip®, and Zip-Rib®. This clamp can also be paired with S-5! PVKIT® to achieve a rail‑free, direct‑mount solar solution.

In May 2022, S-5! launched a new electrical conduit clamp called CanDuit for cable management and wire retention on metal roof PV systems. The clamp features a two‑piece clamshell design with an internal EPDM gasket to prevent abrasion and is equipped with an M8 stud for easy connection with other S-5! products. In addition to the United States, S-5! obtained patents in multiple countries and regions, including China, Australia, Chile, Europe, France, Germany, Ireland, Panama, Spain, and the United Kingdom, covering product families such as GripperFix®, K Grip™, PVKIT® 2.0, TrapBracket™, and RibBracket™.

Domestic Innovations: Drill‑Free Clamps and BIPV‑Specific Clamps

At the 2022 Korea International Green Energy Expo, several Chinese companies showcased clamp products primarily made of aluminum alloy, having passed professional salt spray tests, with surface anti‑corrosion treatment and fine appearance. Their biggest advantage is diverse specifications and support for custom clamps, enabling adaptation to various roof requirements.

In terms of technological innovation, drill‑free metal roof solar clamps emerged in 2022, suitable for standing seam metal roof PV systems, mainly used in commercial and industrial solar projects. These clamps are made of high‑quality aluminum alloy with high corrosion resistance. They achieve a stable connection by mounting on the roof’s standing seam peaks, without damaging the roof structure, and can interface with various mounting and rail systems.

Magerack launched the MageBracket CL mounting kit in 2022, designed for corrugated metal roofs. It is a rail‑less solar mounting system that consists of only two components: a mid‑clamp kit and a universal end‑clamp kit. It is compatible with most solar modules and aims to reduce installation costs and shorten construction time.

In addition, several Chinese patents related to metal roof PV clamps emerged in 2022. One patent for a clamp assembly and building‑integrated PV system uses a coordinated design of a pressure plate and base to achieve both mechanical fixation of PV panels on metal roofs and significantly improved wind uplift resistance. Another PV connector patent uses a combination of a frame clamp, a rotating fastening frame, and a lock to enable quick assembly and disassembly without damaging the roof’s waterproof structure, providing strong wind uplift resistance.

III. Engineering Practice: Typical Applications of Metal Roof Clamps in 2022

JinkoSolar “Jinko BIPV” Project for China Coal Group

In 2022, JinkoSolar partnered with Baodu International to build a BIPV roof for China Coal Group. The project has an installed capacity of 0.39 MW, estimated annual power generation of about 455,000 kWh, a 30‑year integrated lifespan, and a payback period of only five years. During installation, clamps were used throughout: after mounting brackets, laying profiled steel sheets, and seaming, the process proceeded to clamp assembly, locking, fixing the clamps, fixing the modules, and then matching the upper and lower clamps for series connection.

The project used a dual‑glass patented clamp, which is easier to install than traditional clamps and facilitates later disassembly and maintenance. The system uses 360° super‑lock seaming technology to achieve Class I waterproofing for metal roofs; the entire roof system achieves a Class A non‑combustible material rating for fire resistance; it can withstand Class 16 typhoon winds; uses N‑type modules with 3–5% higher specific energy yield than conventional modules; is walkable without requiring reserved maintenance walkways, increasing module density by over 30% compared to conventional modules on the same roof area. Ms. Qian Jing, Vice President of JinkoSolar, stated that Jinko BIPV uses a proprietary structural clamp design, making installation and maintenance quick and convenient, with strong heat dissipation and high system safety.

Mibet Distributed Colored Steel Tile Roof PV Bracket Project

In 2022, Mibet customized a distributed colored steel tile roof PV bracket system for Fujian Nanping Sun Cable Co., Ltd. The project has a total installed capacity of 10 MW, making it the largest distributed rooftop PV station in northern Fujian at the time. Based on roof dimensions, colored steel tile structure, tile spacing, and combined 3D modeling and pull‑out test results, the engineers designed a “Agave‑type 25 Clamp + MD Rail” system solution. The clamp fits tightly with the colored steel tile, providing excellent pull‑out resistance. The lightweight MD rail meets bracket strength requirements while reducing project costs. The mid‑side press and clamping block enable quick installation at any position on the MD rail, effectively improving construction efficiency.

750 kWp Bakery Roof PV Project in Bavaria, Germany

In June 2022, Schaller Bakery in Weiden, Germany, installed a 750 kWp solar system on the metal roof of its production hall. From the first module installation to grid connection, the project took only six weeks. The project used Zambelli RibRoof 465 seam clamps and SolidRail mounting rails, providing a reliable fixation solution for the standing seam metal roof.

IV. Standards, Codes, and Policy Support

In 2022, significant progress was made in China’s standardization system for metal roof PV installations, providing solid support for the standardized application of clamp products.

Zhejiang Province issued construction standard DBJ33/T 1282‑2022 Technical Specification for Integration of Crystalline Silicon PV Systems with Profiled Metal Sheet Roofs, effective from October 1, 2022. It applies to the design, construction, acceptance, operation, and maintenance of crystalline silicon PV systems integrated with profiled metal sheet roofs (with a slope not exceeding 1/8) for new construction, renovation, expansion, and existing building retrofits.

The China Association for Engineering Construction Standardization issued T/CECS 902‑2021 Technical Specification for PV Module Roofing Engineering, effective from January 1, 2022. T/CECS 1176‑2022 Technical Specification for Adding PV Systems on Existing Building Roofs was released in October 2022, applicable to the design, construction, acceptance, and maintenance of structures after adding PV systems on existing building roofs. Furthermore, the draft for comments of the Technical Specification for PV Installation Engineering on Metal Roofs was released in October 2022, indicating ongoing progress in industry standardization.