Solar Module Output Wiring Layout to Reduce Shading Loss
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Solution Overview
Problem
The conventional solar cell module structure requires complex wiring and insulation of output wiring members, which complicates internal wiring and increases operational steps, while also being susceptible to shading effects that deteriorate power generation efficiency.
Innovation Solution
The proposed output line connection structure for a solar cell module involves connecting output wiring members to bus bars at the ends of solar cell connection units, with the wiring members extending outside the back surface protection member through outlets, thereby simplifying internal wiring and reducing shading impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output wiring members are routed inside the solar cell module to the terminal box, then electrical connection is achieved, but wiring complexity and insulation requirements increase
Solution Approach 1:
The output wiring members are extracted from the internal routing path and brought out through outlets on the back surface protection member. This allows the wiring to be performed externally rather than internally, simplifying the internal structure while maintaining electrical connection reliability
Solution Approach 2:
The outlets on the back surface protection member serve as intermediary points where the output wiring members pass through. This mediator structure enables external wiring connection while maintaining the integrity and simplicity of the internal module structure
2Reliability
If multiple second wiring members are arranged in lines on the back surface side, then output extraction is enabled, but insulation steps and operational complexity increase
Solution Approach 1:
The wiring members are taken out from the complex internal arrangement and routed externally through outlets. This extraction eliminates the need for multiple insulation steps and simplifies the installation process while maintaining output extraction functionality
Solution Approach 2:
Instead of routing wiring members from the front through the cells to the back, the invention inverts the approach by bringing the output wiring members out through outlets on the back surface, allowing external connection without internal complexity
3Power
If solar cells are arranged in multiple lines with series connections, then power generation capacity is improved, but shading impact on multiple lines increases
Solution Approach 1:
The solar cell array is segmented into multiple independent connection units, each with its own output wiring member and outlet. This segmentation allows individual units to be optimized and reduces the propagation of shading effects across the entire module
Solution Approach 2:
Each connection unit is treated as a local entity with independent wiring and outlet positioning. This local quality approach allows the module to maintain power generation from unshaded units even when some units are shaded, improving overall resilience
Data Source
AI summary
A solar cell module includes a solar cell string sealed between a transparent substrate and a back surface protection member. The solar cell string includes solar cell connection units in each of which a plurality of solar cells adjacent in a first direction is connected in series with each other. Each of the solar cell connection units is provided with an output wiring member. The output wiring member extends to an outside through the back surface protection member. Outlets and a terminal box are positioned apart from each other in an in-plane direction of the back surface protection member.