Photovoltaic Soiling Monitoring With Clean Reference Panel

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Solution Overview

Problem

Photovoltaic arrays in arid desert regions suffer from soiling due to dust and debris, leading to reduced energy generation, which often goes unnoticed in unmanned installations, necessitating effective monitoring and cleaning solutions.

Innovation Solution

A photovoltaic array monitoring system with a reference and ambient panel, a rechargeable power source, and a transmitter, which measures and transmits data to determine an efficient cleaning schedule, and includes a soiling removal unit to maintain the reference panel's cleanliness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If photovoltaic arrays are installed in arid desert regions, then energy generation potential is improved, but soiling from dust and debris reduces energy output

Engineering Contradiction:

Improveenergy generation potentialVSAvoidsoiling from dust and debris

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary monitoring of soiling conditions on photovoltaic panels before significant energy loss occurs. By continuously measuring optical properties and comparing them against thresholds, the system detects soiling accumulation early and triggers cleaning operations proactively, preventing the harmful effect of dust buildup from reducing energy output below acceptable levels

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback mechanism where optical sensors continuously monitor the condition of photovoltaic panels, and this information is fed back to a control system that automatically initiates cleaning operations when soiling thresholds are exceeded. This closed-loop feedback ensures that cleaning is performed based on actual panel conditions rather than fixed schedules, optimizing the balance between maintaining energy generation and avoiding unnecessary cleaning operations

Inventive Principle:

Principle #23Feedback

2Device complexity

If photovoltaic arrays are left unmanned for extended periods, then operational costs are reduced, but declining energy generation from soiling goes unnoticed

Engineering Contradiction:

Improveunmanned operation simplicityVSAvoidunnoticed energy generation decline

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The system enables photovoltaic arrays to self-monitor and self-report their operational status without requiring human presence. Optical sensors continuously measure panel conditions and automatically transmit data about energy generation performance and soiling levels, allowing the system to detect and report declining energy generation autonomously, eliminating the need for manual inspections while maintaining awareness of system performance

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system replaces manual inspection mechanisms with automated optical sensing and wireless communication technologies. Instead of requiring physical presence to monitor panel conditions, the system uses non-contact optical measurements and electronic data transmission to continuously report on energy generation performance, substituting mechanical/human monitoring with automated electronic systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If reference photovoltaic panels are kept clean, then accurate soiling detection is improved, but additional cleaning operations increase system complexity

Engineering Contradiction:

Improvesoiling detection accuracyVSAvoidcleaning system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system uses a reference photovoltaic panel that replicates the optical and physical characteristics of the monitored panels but is maintained in a clean state. This reference copy serves as a baseline for comparison, allowing the system to accurately measure soiling on operational panels by contrasting their performance against the clean reference, thereby achieving precise soiling detection without requiring complex measurement instrumentation

Inventive Principle:

Principle #26Copying

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 system effectively monitors soiling and determines optimal cleaning times, enhancing energy output by maintaining the reference panel's cleanliness and reducing revenue loss.

Implementation Method 1

a rechargeable power source. The system can further include an electrical unit configured to charge the rechargeable power source using energy from one or both of the reference photovoltaic panel and the ambient photovoltaic panel

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS12476588B2Solar devices and methods

Publication Date: 2025.11.18 NEXTPOWER LLC

AI summary

Photovoltaic array performance monitoring systems and methods are described herein. One embodiment of a photovoltaic array monitoring system according to the present disclosure can include a reference photovoltaic panel and an ambient photovoltaic panel, as well as a rechargeable power source. The monitoring system can further include an electrical unit configured to charge the rechargeable power source using energy from one or both of the reference photovoltaic panel and the ambient photovoltaic panel. The monitoring system can also include a transmitter configured to transmit data from the reference photovoltaic panel and the ambient photovoltaic panel. Methods and full-size solar systems utilizing monitoring systems are also described.