Photovoltaic Panel Junction Box for Exterior Wiring Access
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Solution Overview
Problem
Existing systems for connecting photovoltaic modules on building roofs are cumbersome, requiring under-roof access for module connections and limiting flexibility in wiring configurations, especially during roofing accidents or modifications.
Innovation Solution
An electrical connection box with a bottom, side wall, and internal cavity, featuring a cable outlet and removable electrical switch, allows for secure placement on the exterior panel, enabling easy connection and adjustment of photovoltaic module wiring without under-roof access, using a peripheral rim for sealing and a terminal for plug connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photovoltaic modules are interconnected by cables located opposite the back of the cover, then cable degradation is avoided and aesthetics are preserved, but access to the under-roof is required for connection
Solution Approach 1:
The patent introduces connection boxes as intermediary devices installed in the upper overlap zone between panels. These boxes contain electrical terminals that accept plugs from adjacent panels, enabling electrical connection without requiring access to the under-roof area. The connection box acts as a mediator that transfers the connection function from the difficult-to-access rear cable connection point to an easily accessible upper panel location.
2Ease of manufacture
If male and female electrical connectors are used for panel connections, then assembly is simplified, but flexibility in wiring configuration is lost during roofing accidents
Solution Approach 1:
The patent segments the electrical connection system into modular components: connection boxes installed in each panel's upper overlap zone, electrical terminals within the boxes, and plugs on adjacent panels. This segmentation allows the upper plug to be disconnected and reconnected to different lower plugs, enabling flexible reconfiguration of wiring diagrams when roofing accidents occur, while maintaining simple assembly through the plug-socket interface.
3Adaptability or versatility
If connection boxes are installed in the upper overlap zone, then wiring flexibility is improved, but the device complexity increases
Solution Approach 1:
The connection box is designed as a universal component that performs multiple functions: it houses electrical terminals for connection, provides a protective enclosure, and enables both standard assembly connections and emergency reconfiguration. The same basic connection box structure serves all panels regardless of their position or function, reducing overall system complexity through standardization while maintaining wiring flexibility.
Data Source
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AI summary
The invention relates to an external facing panel for a building, comprising: an upper transverse edge including an upper overlap zone intended to be covered by an adjacent panel, a lower transverse edge including a lower overlap zone intended to cover an adjacent panel, a central part connecting the transverse edges and covered by at least one photovoltaic module, and an opening located in the upper overlap zone and in which an electrical junction box is inserted.