

The aluminum alloy photovoltaic bracket - bidirectional ballast - is a non-penetrating fixed bracket system suitable for flat roof photovoltaic power stations. Utilizing a bidirectional ballast design, it stabilizes the photovoltaic array to the roof surface through counterweight modules (such as precast concrete blocks) placed on both the front and rear sides of the bracket. The entire system is constructed primarily of high-strength aluminum alloy, suitable for various flat roof structures such as concrete, asphalt, and roof rolls. No drilling or welding is required, allowing for photovoltaic system deployment without altering the original roof structure.
Color :
Natural silver/ black(Colored according to customer requirements)Certification :
ISO,SGS,CEMaterial :
Anodized Aluminum 6005 T5, Stainless Steel 304Product Origin :
Tianjin, FujianShipping Port :
Shanghai, Ningbo, Tianjin, Xiamen, Shenzhen portsProduct Description
The Flat Roof PV Mounting Bracket - Bidirectional Ballast (Aluminum Alloy) is a non-penetrating solar panel mounting solution specifically designed for flat roof PV power stations. This system secures the PV array to the roof surface using ballast modules (typically precast concrete blocks or steel ballasts) in both the front and rear directions. It is suitable for various flat roof structures, including concrete, asphalt, and roof rolls.
Unlike traditional drilling-based mounting methods, this product uses a ballast-based fixing principle, relying on gravity rather than mechanical penetration to achieve system stability. Mainstream products such as the BM4 series employ a front and rear support leg structure, suitable for flat roof scenarios requiring a certain tilt angle, allowing PV system deployment without altering the original roof structure.

Product Components

Advantage
▪ Non-penetrating installation: No drilling or welding is required, helping to maintain the integrity of the original roof waterproofing structure.
▪ Lightweight: Aluminum alloy weighs approximately 1/3 of steel, reducing the load on the roof, especially suitable for existing buildings with limited load-bearing capacity.
▪ High installation efficiency: Modular design allows for highly pre-assembly of major components, typically requiring only one tool for on-site securing.
▪ Flexible and adjustable: Installation angles are generally 5°–30°, and can be customized to fit the roof shape and project requirements.
▪ Excellent weather resistance: Anodized surface treatment combined with stainless steel fasteners provides excellent resistance to oxidation, salt spray, and corrosion, with a designed service life of approximately 25 years or more.
Parameters
| Installation | Ground/Concrete Roof |
| Wind Load | up to 60m/s |
| Snow Load | 1.4kn/m² |
| Tilt Angle | 5, 10°, 15° |
| Standards | GB50009-2012, EN1990:2002, ASCE7-05, AS/NZS1170, JIS C8955:2017, GB50429-2007 |
| Material | Anodized Aluminum AL6005-T5, Stainless Steel SUS304 |
| Warranty | 10 Years Warranty |
Applicable Scenarios
▪ Commercial and Industrial Roofs: Flat roof distributed photovoltaic projects for factories, logistics warehouses, and commercial complexes in industrial parks.
▪ Residential Flat Roofs: Multi-story residential buildings and villas, especially suitable for scenarios with high waterproofing requirements and where roof damage is undesirable.
▪ Existing Building Renovation: Adding photovoltaics to roofs with limited load-bearing capacity can reduce reinforcement needs and structural risks.
▪ High Wind Pressure Areas: Coastal areas and typhoon-prone regions; windbreak designs can enhance system stability.
▪ Light Steel Structure Roofs: The lightweight properties of aluminum alloy can reduce the load-bearing requirements of light steel roofs.
Important Notes:
▶ Roof Load Capacity Assessment:
A professional load-bearing capacity calculation of the roof structure is required before installation to ensure it can withstand the total weight of the ballast modules and components.
▶ Wind Resistance Design:
The ballast counterweight scheme should be comprehensively calculated based on the basic wind pressure of the project site, building height, roof type, etc. It is recommended to refer to wind tunnel data or professional software.
▶ Installation Tilt Angle Selection:
Selected based on latitude, irradiance conditions, and actual roof conditions to balance power generation efficiency and system stability; adjustable systems require regular checks on tightness.
▶ Waterproofing:
Although drilling is not required, waterproofing measures are still necessary at the contact surfaces between the guide rails and the roof, as well as at cable routing points, such as laying EPDM rubber mats.
▶ Maintenance Access:
For large-tilt arrays, it is recommended to reserve maintenance walkways and cleaning space.
▶ Avoidance of Roof Facilities:
Avoidance of exhaust pipes, ventilation equipment, air conditioning units, lightning protection strips, etc., maintaining a safe distance.
▶ Lightning Protection Grounding:
The support system should be reliably connected to the building's lightning protection grounding network, meeting grounding resistance requirements.
▶ Compliance:
The scheme should comply with local building codes and photovoltaic installation standards, obtaining approval when necessary.
Summary
Flat roof photovoltaic brackets - bidirectional ballast (aluminum alloy) is a mature distributed photovoltaic solution. It achieves non-penetrating installation through ballast fixing, providing a lighter self-weight while protecting the integrity of the roof structure. Its modular design and factory pre-assembly help shorten on-site construction time, while the aluminum alloy material and anodized treatment ensure long-term weather resistance. The product can meet design requirements for wind loads up to 60m/s and snow loads exceeding 1.4 kN/m², suitable for various scenarios including industrial and commercial projects, residential buildings, and renovations of old buildings. The key to project success lies in conducting thorough structural assessments and wind resistance calculations in the early stages, and selecting an appropriate ballast configuration based on actual conditions.
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