Mechanical Grounding Clamp for PV Frame-to-Rail Bonding
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Solution Overview
Problem
Existing methods for securing photovoltaic module frames to rail systems require separate grounding components, increasing installation costs and labor due to the insulating properties of anodized aluminum, which hinder electrical bonding.
Innovation Solution
A mechanical clamp with an electrically conductive body, compression arms, and a tab that cuts through non-conductive coatings to establish an electrical bond between photovoltaic module frames and rail systems, using angled compression arms and a tab to secure and bond the frames directly to the rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate grounding lugs or bonding washers are installed to achieve electrical bonding, then electrical continuity is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent combines the mechanical fastening function and electrical bonding function into a single clamp assembly. The clamp body with conductive arms simultaneously secures the photovoltaic module to the rail and establishes electrical continuity, eliminating the need for separate grounding lugs or bonding washers.
Solution Approach 2:
The clamp is designed to perform multiple functions: mechanical support, electrical bonding, and grounding. The conductive arms make contact with both the rail and the photovoltaic module frame, providing universal functionality that replaces multiple specialized components.
2Reliability
If separate grounding components are installed to ensure electrical bonding, then electrical safety is improved, but installation labor time increases
Solution Approach 1:
The grounding function is merged into the clamp assembly itself. The conductive arms are integral to the clamp structure, allowing electrical bonding to occur automatically during the single installation action of securing the module, rather than requiring a separate grounding installation step.
Solution Approach 2:
The clamp assembly performs self-grounding through its conductive arms that automatically contact the rail and module frame during installation. The design enables the component to establish its own electrical bonding path without requiring additional grounding components or separate installation procedures.
3Reliability
If separate bonding washers are used to increase electrical contact area, then electrical conductivity is improved, but material cost and supply complexity increase
Solution Approach 1:
The electrical bonding function is merged into the clamp body structure. The conductive arms provide sufficient contact area for electrical conductivity without requiring separate bonding washers, as the bonding capability is integrated into the fastening component itself.
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 clamp provides a cost-effective and efficient electrical bonding solution by eliminating the need for separate grounding components, ensuring reliable electrical continuity while reducing installation costs and complexity.
Implementation Method 1
The first compression arm and the second compression arm are capable of cutting through non-conductive coatings, e.g., anodizing, on the aluminum frame and/or the aluminum rail to form an electrical bond between the frame and the rail
Data Source
AI summary
Bonding clamps used to assemble photovoltaic (PV) arrays and provide an electrical bond between PV module frames and a rail system forming the PV arrays are described. The bonding clamp includes an electrically conductive body, first and second compression arms extending from body and a tab extending from the body in a direction away from a bottom side of the body. The first and second compression arms extend at an angle relative to the body.