Solar Water-Pump Control With Automatic Hybrid Power Switching

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Solution Overview

Problem

Solar power systems for water pumps in remote arid areas face challenges with power fluctuations and availability, leading to inconsistent water pressure and flow, especially at night or during low solar radiation, and existing systems fail to efficiently combine DC solar power with AC power from grids or generators.

Innovation Solution

An automated system with an Electronic Control Unit (ECU) and Variable Frequency Drive (VFD) that manages solar DC and AC power sources, using algorithms like Maximum Power Point Tracking (MPPT) and Automatic Power Compensation (APC) to maintain consistent water pressure and flow by prioritizing solar power and supplementing with AC power as needed, in various operational modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If solar power is used to drive water pumps, then environmental friendliness and energy cost are improved, but power availability and consistency deteriorate due to nighttime and weather fluctuations

Engineering Contradiction:

Improveenergy costVSAvoidpower availability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The system performs preliminary action by storing excess solar energy in batteries during daytime when solar power is abundant, so that this stored energy can be retrieved and used during nighttime or cloudy periods when solar power is insufficient, thus ensuring continuous pump operation without compromising reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system merges multiple power sources (solar panels, AC grid, and batteries) into a unified hybrid power system that automatically switches between them based on availability and requirements, combining the environmental benefits of solar power with the reliability of grid power and battery backup

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If solar power alone is used, then energy independence is improved, but water pressure and flow consistency deteriorate during low radiation periods

Engineering Contradiction:

Improveenergy independenceVSAvoidwater pressure

Core Design Contradiction:

Adaptability or versatilityVSStress or pressure

Solution Approach 1:

The system achieves universality by designing a multi-functional power supply architecture that can operate in multiple modes (solar-only, grid-supplemented, battery-backed, or hybrid combinations), allowing it to maintain water pressure consistency across different operating conditions while preserving energy independence through intelligent power source selection

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If AC power from grid or generator is used to supplement solar power, then pump operation consistency is improved, but system complexity and cost increase

Engineering Contradiction:

Improveoperation consistencyVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements feedback control through an electronic control unit that continuously monitors solar power availability, battery charge levels, and pump performance, automatically adjusting power source selection and pump speed to maintain consistent operation while managing system complexity through intelligent automation rather than manual intervention

Inventive Principle:

Principle #23Feedback

4Use of energy by moving object

If pump speed is reduced during low solar power, then energy consumption is reduced, but water flow and irrigation effectiveness deteriorate

Engineering Contradiction:

Improveenergy consumptionVSAvoidwater flow

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The system applies dynamics by enabling the pump to operate at variable speeds rather than fixed speed, allowing it to run at lower speeds during low solar power periods to conserve energy while automatically increasing speed when additional power sources are available, thus optimizing the balance between energy consumption and water flow productivity dynamically based on real-time power availability

Inventive Principle:

Principle #15Dynamics

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

Ensures continuous operation of water pumps at requested speeds, maximizing solar energy use while minimizing grid or generator reliance, maintaining water pressure and flow, and extending equipment lifespan.

Implementation Method 1

solar photovoltaic energy provided by local solar panels

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentEP4059109B1Device for controlling solar driven water pumps and method in which such a device is applied

Publication Date: 2025.10.29 WELL PUMPS

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AI summary

Device (1) for controlling solar driven water pumps (2) with three selectable modes on the control panel (3) being: I) Speed mode with 100 % use of the available solar DC power at all times; II) Solar mode using available solar DC power only, and III) Eco-mode combining the use of the available solar DC power with the use of the AC power from a grid or a generator and/or batteries, by automatic switching between two stages, being (i) solar stage running on solar DC power only, and (ii) hybrid stage running with solar DC power and AC power from grid or generator and/or batteries like in full speed mode. The purpose of the invention is to preferentially use solar energy from solar panels over AC current from the electric grid or from a generator and/or batteries while ensuring sufficient pumping capacity.