Rooftop Solar Mount With Sacrificial Layer for Roof Membrane Wear
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Solution Overview
Problem
Rooftop solar energy systems face issues with roof penetrations leading to leaks due to friction between mounting components and the roof membrane, caused by vibrations and thermal expansion differences, which existing ballasted systems fail to adequately address.
Innovation Solution
An integrated sacrificial material is mechanically connected to the mounting structure, allowing for limited movement between the roof and the material, reducing direct transmission of vibrations and thermal stress, and is pre-installed on the structure for ease of installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a ballasted system with metal tray is used to hold solar panels on rooftop, then the solar panel array can be secured against wind load and building movements, but the friction between the ballast tray and roof membrane during vibrations and thermal expansion causes wear and roof leaks
Solution Approach 1:
The patent introduces a sacrificial material as an intermediary layer between the ballast tray and the roof membrane. This sacrificial material absorbs the friction and wear that would otherwise directly affect the roof membrane, while still allowing the ballast tray to effectively hold the solar panels against wind loads and building movements.
Solution Approach 2:
The sacrificial material is designed as a consumable component that can be easily replaced. Instead of protecting the permanent roof membrane from wear, the system uses a disposable sacrificial material that absorbs the wear damage, thereby protecting the more valuable and permanent roof membrane.
2Object-affected harmful factors
If a sacrificial material is placed between the roof membrane and ballast tray, then roof membrane wear is reduced, but additional installation steps and materials are required
Solution Approach 1:
The patent combines the sacrificial material with the ballast tray into a single integrated assembly. The sacrificial material is pre-positioned within or attached to the ballast tray, eliminating the need for separate installation steps and reducing overall installation complexity while still providing wear protection.
Solution Approach 2:
The sacrificial material is pre-installed on the ballast tray during manufacturing or pre-assembly, rather than requiring separate installation on the roof. This preliminary action simplifies the on-site installation process by reducing the number of steps required.
3Ease of operation
If the ballast tray rests directly on the roof membrane, then installation is simpler, but friction during vibrations and thermal expansion causes wear holes and leakage
Solution Approach 1:
The sacrificial material serves as a mediator between the ballast tray and roof membrane, maintaining the simple direct-contact installation approach while preventing the harmful friction wear that would compromise roof leakage resistance over time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces wear on the roof membrane by absorbing movements and preventing direct transmission of stress, thereby minimizing the risk of leaks and extending the lifespan of the roof.
Implementation Method 1
the ballast tray and other mounting components rub against the roof membrane during small building vibrations, small vibrations of the panels from wind
Implementation Method 2
Over time, this friction can wear a hole through the roof membrane
Implementation Method 3
differing thermal expansion rates between the building and solar energy mounting system
Data Source
AI summary
A building rooftop mounting structure including a sacrificial material that allows freedom of movement between itself and the rooftop as well as between itself and the mounting structure.