Integrated Trunk Bus Layout That Eliminates Solar Combiner Box Overheating

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Solution Overview

Problem

Conventional solar power generation systems face issues with combiner box overheating and failure due to high currents, require labor-intensive installation of electrical bus systems, and incur high material costs from hanger components and trenching.

Innovation Solution

An integrated trunk bus system that combines positive and negative bus lines with a messenger cable, secured by brackets without hardware, and uses multi-tap connectors to eliminate combiner boxes, reducing installation labor and costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional combiner boxes are used to collect current from solar panel arrays, then current collection is achieved, but overheating and failure occur due to high currents and connection losses

Engineering Contradiction:

Improvecombiner box reliabilityVSAvoidcombiner box temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent removes the combiner box from the system entirely and replaces it with an integrated bus system where conductors are directly connected to solar panel arrays through connectors. This extraction eliminates the intermediate component that was generating heat and reliability issues.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent combines the functions of current collection, support, and identification into a single integrated bus system. The messenger cable provides both mechanical support and electrical conductivity, while color coding integrates identification functionality, eliminating the need for separate combiner boxes.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If conventional electrical bus systems are installed using trenches and hanger components, then electrical connectivity is achieved, but installation labor and material costs increase significantly

Engineering Contradiction:

Improveelectrical bus system reliabilityVSAvoidinstallation speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent uses a flexible messenger cable that can be easily routed and attached to vertical supports without requiring rigid trenching or multiple hanger components. The cable's flexibility allows for rapid installation by simply attaching it to the supports and connecting conductors along its length.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The messenger cable serves multiple functions simultaneously: it provides mechanical support for the conductors, acts as an electrical conductor itself, and serves as a routing guide. This multi-functionality eliminates the need for separate support structures and reduces installation complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If conventional hanger components are used to support electrical bus lines, then mechanical support is achieved, but material costs and installation complexity increase

Engineering Contradiction:

Improveelectrical bus system support strengthVSAvoidinstallation hardware complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The messenger cable performs both mechanical support and electrical conduction functions, eliminating the need for separate hanger components. This universal component reduces both material costs and installation complexity while maintaining the required structural strength.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the support function and conduction function into a single messenger cable component, eliminating the need for separate hanger hardware and reducing the overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

4Productivity

If numerous connection points are used in combiner boxes, then current collection from multiple arrays is achieved, but connection losses and overheating increase

Engineering Contradiction:

Improvecurrent collection efficiencyVSAvoidconnection loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent removes the combiner box with its numerous connection points and replaces it with direct connector-to-conductor connections. This extraction eliminates the intermediate connection points that were generating energy losses and heat.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12483188B2Electrical bus system and components

Publication Date: 2025.11.25 WIND TURBINE & ENERGY CABLES CORP

AI summary

An electrical bus system has an integrated trunk bus that includes at least one positive bus line, an equal number of negative bus line, and a messenger cable that that are twisted together to form a single, integrated trunk bus line. The messenger cable provides mechanical support and is coupled to vertical support using brackets, ground clamps, or other suitable coupling techniques, thereby eliminating the need for cable hangers or trenching. The messenger cable provides a grounding function, thereby eliminating the need for an additional grounding line. Multi-tap shear bolt connectors are used to connect the integrated trunk bus line to photovoltaic wires carrying the output from one or more solar panel arrays, thereby obviating the need for combiner boxes used in conventional systems.