Modular Off-Grid Mini-Inverter Grid Flexibility
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Solution Overview
Problem
Existing DC to AC power inversion systems lack scalability and redundancy to efficiently supply power to off-grid applications such as motors, pumps, fans, lights, appliances, and homes without grid connection, and do not offer flexibility to operate both on and off the grid.
Innovation Solution
The development of Smart and Scalable Off-Grid Mini-Inverters that can connect multiple DC sources to generate single-phase or three-phase AC power, featuring a scalable and redundant design with a novel concept of Grid Flexibility, allowing them to function both as Grid-tie and Off-grid inverters, ensuring reliable power supply and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple DC sources are connected to generate AC power for off-grid applications, then power supply reliability is improved, but system complexity increases
Solution Approach 1:
The inverter is divided into modular units with standardized interfaces. Each module can independently process DC to AC conversion, and multiple modules can be connected in parallel to serve multiple DC sources. This segmentation allows systematic expansion while maintaining manageable complexity through uniform building blocks.
Solution Approach 2:
The inverter design incorporates universal input interfaces that can accept multiple types of DC sources (solar panels, batteries, fuel cells) through standardized connection protocols. The control system provides multi-functional capabilities to manage different source characteristics, enabling a single device to handle diverse power inputs without requiring separate specialized inverters for each source type.
2Strength
If redundant capabilities are added to work in harsh environments, then durability is improved, but device complexity increases
Solution Approach 1:
The inverter incorporates redundant computational resources and error correction mechanisms before failures occur. The control system includes backup processing capabilities and diagnostic functions that proactively monitor system health, allowing the device to withstand harsh environmental conditions and recover from potential failures without requiring complex external intervention.
3Adaptability or versatility
If the inverter can operate both on and off the grid, then adaptability is improved, but control complexity increases
Solution Approach 1:
The inverter employs dynamic operational modes that can switch between grid-tied and off-grid configurations. The control system automatically adjusts its behavior based on grid availability and system requirements, providing adaptive functionality rather than requiring separate dedicated systems for each operating mode.
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
The Smart and Scalable Off-Grid Mini-Inverters provide a cost-effective, reliable, and user-friendly solution for off-grid energy needs, ensuring efficient power generation and distribution while maintaining grid flexibility, reducing system costs and enhancing durability in harsh environments.
Implementation Method 1
DC to AC power inverters that invert DC power from single or multiple DC power sources to single-phase or three-phase AC power
Data Source
AI summary
A method and apparatus is disclosed for intelligently inverting DC power from DC sources such as photovoltaic (PV) solar modules to single-phase or three-phase AC power to supply power for off-grid applications. A number of regular or redundant off-grid Mini-Inverters with one, two, three, or multiple input channels in a mixed variety can easily connect to one, two, three, or multiple DC power sources such as solar PV modules, invert the DC power to AC power, and daisy chain together to generate and supply AC power to electrical devices that are not connected to the power grid including motors, pumps, fans, lights, appliances, and homes.