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Designed specifically for flat roofs, this system utilizes high-strength aluminum alloy and a triangular stabilizing structure, and is pre-assembled at the factory. Secured by concrete ballast, it does not damage the roof and is compatible with various photovoltaic modules, making it a reliable base for flat roof power stations.
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 ports
Product Description
The Flat Roof PV Mounting Bracket - Unidirectional Ballast (Aluminum Alloy) is a non-penetrating PV support system developed for flat roof applications. This system uses aluminum alloy as the primary structural material and employs ballast blocks (such as concrete blocks or counterweights) to secure the bracket and PV modules to the roof, eliminating the need for drilling or damaging the existing roof structure.
The "unidirectional ballast" design means the system has a fixed installation orientation and tilt angle, suitable for flat roof power stations with specific sunlight orientation requirements. Compared to adjustable or multidirectional ballast systems, the unidirectional ballast system has a simpler structure and fewer components, helping to reduce material costs and installation complexity.
Product Components
Advantage
▶ Non-penetrating installation protects the roof structure:
The system uses a ballast counterweight fixing method, eliminating the need for drilling or welding on the roof, helping to maintain the roof's original condition and reducing the impact of installation work.
▶ Lightweight design reduces roof load:
The main support structure is made of high-strength aluminum alloy, resulting in a lighter overall weight. This helps control the increase in constant load on the roof while ensuring stability.
▶ Modular structure for high installation efficiency:
System components are standardized and manufactured in the factory, with most parts pre-assembled before delivery. On-site installation requires only minimal tightening work, contributing to shorter construction periods.
▶ Corrosion resistance for diverse environments:
Aluminum alloy materials (such as 6005-T5) combined with anodized surface treatment provide good corrosion resistance in humid and salt spray environments, making it suitable for rainy and humid environments such as coastal areas.
▶ Flexible layout adapts to different roof shapes:
The modular design allows for flexible layout of the system according to roof shape, component size, and installed capacity requirements, adapting to complex roof geometries.
▶ Windproof design enhances system stability:
Through reasonable structural design and optional wind deflectors, the system can resist the impact of wind loads to a certain extent, enhancing the overall stability of the photovoltaic array.
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:
Before installation, it is recommended to assess the structural load capacity of the existing roof to confirm its ability to withstand the total load of the photovoltaic system's self-weight and ballast. New loads should be controlled within the acceptable range of the structural design; if necessary, a professional organization can be commissioned for testing and assessment.
▶ Wind and Snow Load Calculation:
The system's ballast weight needs to be calculated based on the meteorological conditions (maximum wind speed, basic snow pressure) of the project location to ensure stability under different environmental conditions. The requirements for ballast weight may vary significantly in different regions.
▶ Installation Angle Design:
The installation tilt angle should be comprehensively determined based on the latitude, sunlight conditions, and shading situation of the project location to facilitate better power generation efficiency for the photovoltaic modules. When the tilt angle is less than 10°, it is recommended to reserve a passage for maintenance and manual cleaning.
▶ Roof Drainage Considerations:
When installing the photovoltaic bracket, the original roof drainage system should be kept unobstructed to avoid the bracket components or ballast blocks blocking the drain outlets or affecting the eaves drainage path. A zoned or intermittent arrangement can be used to meet drainage requirements.
▶ Safety Management During Construction:
Safety precautions should be taken during rooftop work. Photovoltaic modules should be protected from collisions and damage during storage, handling, and hoisting. After installation, consider placing necessary safety warning signs along roof edges and in areas where personnel may approach.
▶ Maintenance and Inspection:
It is recommended to regularly check for loose fasteners on the support structure, corrosion or damage to aluminum alloy components, and promptly clear snow from the surface of the photovoltaic modules in snowy areas to ensure the normal operation of the system.
▶ Professional Design and Selection:
The selection of support structure, structural design, and ballast configuration should be calculated by a professional organization or experienced technicians to avoid relying solely on experience.
Summary
Flat roof photovoltaic (PV) brackets - unidirectional ballast (aluminum alloy) - are a non-penetrating support solution designed for flat roof PV power stations. The system uses extruded aluminum alloy profiles as the main structural components, achieving fixation through ballast counterweights, and features lightweight construction, corrosion resistance, and modular installation. The unidirectional fixing design makes the system structure simpler, with fewer components, helping to reduce material costs and installation complexity.
This product is suitable for industrial and commercial plant roofs, commercial buildings, and residential flat roofs, especially suitable for roof conditions where drilling is not feasible or where roof load control is required. While ballast brackets may not be as wind-resistant as penetrating anchoring solutions, through reasonable counterweight design and optional wind deflectors, they can maintain relatively reliable stability under various environmental conditions.
Solar First Project Reference
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