A module mounting structure (MMS) is the supporting structure that holds the PV modules to the roof or ground and provides the desired tilt angle for a maximum generation it is designed for. The type of MMS design is based on the surface of installation i.e. Iron, RCC or Asbestos roof. Generally, module mounting structures are of three types: Hot Dip Galvanized Iron (GI) Aluminium Mild Steel (MS) Various rigorous structural analysis and tests for protection against wind and also for the mechanical strength of the MMS to guarantee the safety and stability of the mounting structures are required to be conducted before installation.
Solar PV modules can be installed on almost all kinds of rooftops. The complexities involved in installing a PV module may differ with different rooftops, type of roof construction and roof strength. Therefore there are different PV module mounting structures for metal roofs and flat concrete roofs. Some of the examples of commonly used mounting structures based on the roof type are mentioned below. Flat concrete roofs (example RCC) Concrete roofs are in general the easiest way to install a solar power plant as the access for installation and later operations and maintenance if very easy. Depending on the roof design and shadow-free area the common type of module mounting structures for concrete roofs are highlighted below: 1. Low elevation ballast structures This type of structures are designed for flat roofs with limited load capacity and where there are no shadow issues. The design of the system includes a windshield (sloped wind deflector) that seals the system and reduces the suction force of the wind on the PV modules making the installation stable under high wind load and prevents the frame from overturning/lifting. Typically such mounting structures have a tilt angle of not more than 15 degrees. 2. Elevated ballast structure This type of structures are advised for flat RCC roofs which have shading issues. These structures can be designed for high ground clearance and can easily combat heavy wind loads. These structures are also designed for installation with penetration to the roof; however, it is not recommended. Instead ballast-based […]
Many property owners worry about damaging their roof on installing a rooftop solar PV power plant. However, as these installations will last at least for 25 years, so it is important to make sure that all pre-existing damage to the roof is assessed and repaired, if needed. It is also to be noted that the installation being done should be well within the safety limits and it should be able to withstand the weight of an additional structure without any structural damage, leakage and water logging, etc. PV module mounting structures designed and installed correctly do not cause damage to the roof. The spacing of brackets and purlins spreads the weight of the solar panels across a large cross-section of the roof area. If you have a flat roof, you won’t need to put holes in it for installation. Installations on flat roofs commonly use ballast mounting systems which involve no holes. A few examples of ballast mounting structures used widely these days are: Roof damage as a result of a solar PV power plant installation is extremely rare because installers take precautionary steps while installing the structure and the solar panels. However, if property owners are concerned about damage to the roof, they can question the installer about their installation process, measures they take to prevent roof damage and workmanship warranty, and check whether it covers the roof damage in case it occurs.
Hot Dip Galvanizing is the process of applying a zinc coating to fabricated iron structure by immersing the structure in a bath consisting primarily of molten zinc. The galvanizing prevents the corrosion of the iron structure by providing a tough metallic zinc envelope, which completely covers the surface of the structure and seals it from the corrosive action of its environment. Hot-dip galvanizing involves three main steps: Preparation: The galvanizing reaction can only occur on a chemically clean surface, so the first step of the process involves removing any contamination on surface of the iron structure. Galvanizing: The clean iron structure is dipped into the molten zinc, and held there until the temperature of the iron quilibrates with that of the bath. The structure is then pulled-out & allowed to cool. Inspection: After galvanizing, the coated materials are inspected for coating thickness, uniformity and coating appearance. It is advisable to have galvanization post-fabrication of the structure in order to avoid any damage to the galvanized layer. The thickness of galvanization varies from 40 -150 micros depending on the local site conditions and requirements.