Split-Bus Electrical Panel for Critical Load Isolation
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Solution Overview
Problem
Residential photovoltaic systems with battery back-up currently require a separate panel for critical loads during utility outages, which is cumbersome and inefficient, as they typically provide lower power levels than utility power and necessitate load relocation.
Innovation Solution
A single split-bus electrical panel with back-feed circuit breakers and a Microgrid Interconnection Device (MID) allows for isolation of critical loads from standard loads, using renewable energy and back-up power sources to supply critical loads during outages, with a relay system switching between utility, renewable, and back-up power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate back-up panel is installed for critical loads, then critical loads can be powered during utility outages, but the device complexity and installation complexity increase
Solution Approach 1:
The patent combines the main service panel and critical loads back-up panel into a single integrated split-bus electrical panel. The first bus section services standard loads while the second bus section services critical loads, both within one physical panel structure. This merging eliminates the need for separate panels while maintaining the ability to isolate and power critical loads during outages through the relay system and back-feed circuit breakers.
2Reliability
If a separate back-up panel is installed, then critical loads can be isolated during outages, but the ease of operation and load management becomes more difficult
Solution Approach 1:
The patent integrates both standard loads and critical loads into a single split-bus panel with automated relay control. The relay system automatically isolates the critical loads section during outages without requiring manual intervention to relocate loads between panels. This merging maintains load isolation capability while simplifying operation through automation.
Solution Approach 2:
The relay system automatically detects utility power status and autonomously isolates or connects the critical loads section as needed. The back-feed circuit breakers and relay work together to self-manage the power configuration during outages without requiring user action to reconfigure the electrical system or relocate loads.
3Reliability
If photovoltaic systems with battery back-up are used, then auxiliary power is available during outages, but the power level is lower than utility power requiring load allocation
Solution Approach 1:
The patent segments the electrical panel into two distinct bus sections: a first bus for standard loads and a second bus for critical loads. This segmentation allows the limited photovoltaic/battery power to be allocated exclusively to critical loads during outages, while standard loads remain disconnected. The split-bus architecture enables efficient power distribution matching supply capabilities with load priorities.
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
This solution provides a simplified and efficient means to power critical household loads during utility outages using a single residential electrical panel, ensuring continuous power to essential devices without the need for separate panels, leveraging photovoltaic and back-up energy sources.
Implementation Method 1
a relay system switching between utility, renewable, and back-up power sources
Data Source
AI summary
An apparatus provides a single split-bus electrical panel with back-feed circuit breakers arranged to allow connection of a Microgrid Interconnection Device (MID) for isolation of a critical loads section from a standards loads section during back-up operation due to a utility power outage. A first panel section of the split-bus electrical panel supplies power to non-critical standards loads in a residence. A second panel section of the split-bus electrical panel supplies power to critical loads in the residence, which must continue to be powered during a utility power outage.