Solar Wire Harness In-Line Fuse Segmentation
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Solution Overview
Problem
The high cost and labor-intensive process of conventional wiring in solar energy systems, which often results in unnecessary shutdown of solar panels due to blown fuses, and the complexity of troubleshooting and maintaining electrical infrastructure in solar plants.
Innovation Solution
The use of wire harnesses with in-line fuse assemblies that connect solar panel junction boxes to recombiner boxes, featuring fuses and optional blocking diodes, allowing for easy replacement of individual fuses and reducing the need for extensive combiner box maintenance, with connectors facilitating 'plug and play' functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional combiner box wiring is used, then all solar panels are protected by centralized fuses, but a blown fuse shuts down the entire array downstream
Solution Approach 1:
The patent divides the centralized fuse protection into individual branch-level fuse assemblies. Each wire harness branch has its own inline fuse assembly, segmenting the protection system so that a blown fuse only affects one branch rather than the entire downstream array. This segmentation maintains reliability through distributed protection while preserving productivity by isolating failures to minimal segments.
2Reliability
If conventional combiner box wiring is used, then comprehensive fuse protection is provided, but troubleshooting and repair become complex and labor-intensive
Solution Approach 1:
By placing fuse assemblies at branch level rather than centralizing them in a combiner box, the system segments the protection function into independent, accessible units. Each branch can be independently troubleshooted and repaired without affecting other branches, dramatically simplifying maintenance while maintaining comprehensive protection coverage.
Solution Approach 2:
The fuse function is extracted from the centralized combiner box and placed directly at each wire harness branch. This extraction makes fuses easily accessible for troubleshooting and replacement, eliminating the need to open and work within the complex combiner box environment, thereby improving ease of repair while maintaining protection coverage.
3Reliability
If qualified electricians perform conventional wiring, then proper electrical connections are achieved, but installation costs and labor time increase
Solution Approach 1:
The wire harnesses are pre-assembled with connectors and inline fuse assemblies attached before field installation. This preliminary preparation of electrical connections ensures proper wiring quality while reducing on-site installation complexity, allowing for faster deployment and reduced labor costs without compromising connection reliability.
Solution Approach 2:
The patent employs inexpensive, easily replaceable inline fuse assemblies that can be quickly swapped if failed. These simple, standardized components reduce the need for expensive, skilled labor during installation and maintenance, while still ensuring reliable electrical connections through proper design and integration.
Data Source
AI summary
A wire harness connects multiple solar panel junction boxes to a recombiner box. The wire harness includes in-line fuse assemblies, with optional blocking diodes, so each string of solar panels is associated with one fuse. In the event of a blown fuse, only one upstream solar panel string is affected. Entire wire harnesses and/or individual in-line fuse assemblies can be easily swapped out, thereby decreasing the time and expense of troubleshooting and repairing.