1. Installation Efficiency Revolution: Bottom‑Mounting Clamps Disrupt Tradition

In 2024, installation efficiency became the primary driver of mid‑clamp innovation. Polish company Energy5 launched a revolutionary bottom‑mounting end and mid clamp solution in 2024, which has been registered with the Polish Patent Office (UPRP). The core value of this innovative design is that installers no longer need to hold clamps and screws from above the module; instead, they work from underneath, completely eliminating the risk of installers bracing themselves on modules or stepping on panel surfaces, effectively reducing micro‑cracks caused by installation operations. Industry feedback indicates that bottom‑mounting designs can improve installation efficiency by 20‑30% while significantly enhancing on‑site safety.

Cezary Rutkowski, Technical Director of Energy5, stated: “Clamps mounted from the bottom of the module not only speed up installation, but also simplify maintenance and increase the safety and durability of the entire system.” The product is manufactured using high‑quality Magnelis® coated steel from ArcelorMittal, combined with stainless steel fasteners, ensuring long‑term outdoor durability and excellent corrosion resistance. This innovation marks a paradigm shift in mid‑clamp design from “top‑mount operation” to “bottom pre‑assembly”, providing a new path for improving installation efficiency in large‑scale power plants.

2. Safety Certification Milestone: UL 2703 Becomes a Key Entry Barrier

In 2024, the importance of UL 2703 certification in the mid‑clamp sector became even more prominent. As a key safety standard for PV mounting systems in the North American market, UL 2703 covers support devices, clamps/fastening devices, and grounding terminals, and is applicable to PV module systems with a maximum system voltage of 1500 V.

In March 2024, Sun Ballast‘s PowerClamp bracket officially obtained UL 2703 certification. The bracket is made of SUS304 stainless steel and uses metal “teeth” to bypass the anodised layer of the module frame, enabling rapid electrical bonding and simplifying grounding. Tests have shown that the bracket withstands wind and snow loads up to 200 kg/m² and pull‑out forces of 500 kg. UL 2703 certification, issued by CSA Group, is one of the world‘s most stringent safety standards for solar mounting systems, ensuring compliance with strict electrical, mechanical, and structural safety requirements.

In December 2024, GameChange Solar‘s rectangular‑head bolt design also obtained UL 2703 certification. This patented bolt effectively prevents pull‑out under extreme high‑wind conditions. The elongated bolt head hooks onto the inside of the module frame during installation, allowing one‑handed nut tightening, saving labour time compared to traditional two‑handed methods.

3. Patent Technology Breakthroughs: Integrated Grounding and Structural Optimisation

In 2024, numerous patent innovations emerged in the mid‑clamp field, focusing on three main directions: integrated grounding, adjustable design, and structural strength enhancement.

3.1 Integrated Grounding Technology: Deformable Serrated Washer Breakthrough

In June 2024, SOLAR FOUNDATIONS USA obtained a patent for an integrated grounding mid clamp. The core innovation of this patent is a deformable serrated washer designed to pierce the anodised layer of the solar module frame to achieve reliable electrical bonding. The deformable serrated washer can deform to avoid impeding proper contact between the mid clamp and the module frame, ensuring reliable grounding connections. This design solves the problem of grounding failure caused by insufficient washer deformation in traditional grounding clamps, providing a more reliable solution for UL 2703 compliance.

3.2 Adjustable Mid Clamps: Adapting to Diverse Module Sizes

As PV module power increased to 600W+, the variation in frame thicknesses and dimensions became more pronounced. In 2024, adjustable mid clamps rapidly moved from “nice‑to‑have” to “default choice”. Manufacturers such as Seny Energy introduced adjustable mid clamps compatible with frame thicknesses ranging from 28‑50 mm, accommodating multiple module brands. This trend is particularly evident in the distributed PV market, where multiple module brands are often used in the same project – adjustable mid clamps effectively solve the compatibility problem of mixed module installations.

3.3 Structural Strength Enhancement: Closed‑Rectangular Design

Sunforson upgraded its mid clamp structure in 2024, adopting a closed‑rectangular design and adding washers on the side of the end clamp to form a closed triangular structure, significantly improving clamping stability and wind resistance. This design optimisation results in more uniform stress distribution under extreme wind loads, reducing the risk of localised over‑pressure on module frames.

4. Technology Trends: Adjustability, Integrated Grounding, and Material Upgrades

In 2024, the mid‑clamp industry exhibited four major technology trends:

4.1 Adjustable Design Becomes Standard

As module frame thicknesses expanded from the traditional 30 mm to a range of 28‑50 mm, adjustable mid clamps are rapidly moving from a “nice‑to‑have” to a “default choice”. This trend is especially pronounced in projects using mixed module brands – adjustable designs allow installers to avoid stocking multiple clamp types for different modules, significantly reducing inventory complexity and on‑site installation errors.

4.2 Integrated Grounding Functionality Proliferates

The spread of UL 2703 certification is driving integrated grounding functionality to become a standard feature of mid clamps. The traditional “clamp + separate grounding wire” approach is being replaced by all‑in‑one designs with built‑in grounding teeth, simplifying installation while reducing material costs and potential failure points.

4.3 Material Upgrades: Stainless Steel and High‑Strength Aluminium in Parallel

In 2024, material selection for mid clamps showed clear polarisation: standard inland projects use anodised aluminium alloy (6005‑T5), balancing lightweighting with cost control; coastal and high‑corrosion environments upgrade to SUS304 or SUS316 stainless steel to ensure a service life of more than 25 years.

4.4 Diverse Fast‑Install Designs

In addition to Energy5‘s bottom‑mounting solution, various snap‑fit and pre‑assembled fast‑install designs emerged in 2024. These designs reduce the number of bolts and optimise installation steps, shortening installation time per module by 30‑50%.

5. 2024 Mid‑Clamp Industry Trend Summary

6. Future Outlook

Looking ahead to 2025 and beyond, PV module mid clamps will continue to evolve in the following directions:

Standardisation and modularisation: Adjustable mid‑clamp designs will become more standardised, forming unified product families covering 28‑50 mm frame thicknesses, reducing installer inventory pressure.

Integrated functionality: Mid clamps will further integrate grounding, anti‑loosening, torque indication and other functions, achieving “one clamp, multiple uses” and reducing component count and installation steps.

Lightweight materials: High‑strength aluminium alloys and new composite materials will enable thinner clamp walls, reducing material consumption by 15‑20% under the same load.

Smart detection: Mid clamps with torque indication or sensor functionality will enter the market, helping installers verify torque compliance in real time and reducing module damage risk from improper torque.

Global certification harmonisation: Standards such as UL 2703, TÜV, and CE will further align, facilitating global circulation of mid‑clamp products.