PV Soiling Measurement Jig Using Three-Station Self-Assessment
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Solution Overview
Problem
Existing methods for measuring soiling effects on photovoltaic devices are prone to high uncertainty due to inherent differences between reference and test devices, leading to inaccurate power loss calculations, and require intensive periodic assessments that are impractical for long-term monitoring.
Innovation Solution
A device and method using a test jig with three measurement stations to measure a single PV device under full exposure, clean conditions, and soiled conditions, calculating a Soiling Ratio based on short circuit current and maximum power measurements to accurately quantify soiling effects, minimizing uncertainties and allowing for in-field use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two PV devices are used for performance-based soiling measurement, then direct power loss measurement is achieved, but measurement uncertainty increases due to intrinsic differences between devices
Solution Approach 1:
The patent merges the reference measurement and test measurement into a single PV device by implementing three measurement stations (full exposure, clean condition, soiled condition) that sequentially measure the same device. This eliminates the reliability issue of comparing two different devices while maintaining the ability to measure both reference and soiling effects on one device.
Solution Approach 2:
The measurement process is segmented into three distinct stations: Station 1 for full direct unobstructed exposure (reference), Station 2 for clean condition measurement, and Station 3 for soiled condition measurement. This segmentation allows systematic comparison while using the same PV device throughout, resolving the contradiction between direct measurement and measurement reliability.
2Measurement precision
If intensive periodic in-lab PV assessment is performed to accommodate device differences, then measurement accuracy improves, but practicality for long-term monitoring deteriorates
Solution Approach 1:
The system performs self-assessment by automatically measuring the PV device in three different conditions through the three stations and calculating the soiling ratio without requiring external laboratory assessment. This makes the system practical for long-term autonomous monitoring while maintaining accuracy.
Solution Approach 2:
The patent replaces the mechanical process of physically transporting devices to laboratories with an automated in-situ measurement system that uses three stations to simulate different conditions. This substitution enables continuous monitoring without intensive periodic lab assessments.
3Measurement precision
If a single PV device is measured under three different conditions, then measurement uncertainty is reduced, but device complexity increases
Solution Approach 1:
The PV device serves multiple functions by being measured in three different conditions (full exposure, clean, soiled) to simultaneously obtain reference values and soiling effects. This multi-functionality reduces measurement uncertainty without requiring multiple separate devices, balancing precision and complexity.
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 approach provides a reliable, practical, and cost-effective method for monitoring soiling effects, reducing measurement uncertainties and enabling accurate energy production loss calculations, suitable for widespread applications from research to industry.
Implementation Method 1
the conversion of sunlight to electricity using a photovoltaic (PV) module that consists of electrically connected solar cells
Data Source
AI summary
The device and method for measuring the effect of soiling on a photovoltaic device includes a device in which a photovoltaic device (reference solar cell, solar cells, PV module, etc.) may be shifted between partially and fully enclosed compartments in quick succession for measurements of the same device (1) when directly exposed to illumination or solar radiation; (2) when placed under a glass or transparent cover maintained cleared or cleaned of soil; and (3) when placed under glass or transparent cover left exposed to natural outdoor soiling, or attenuated using simulated soil that is not periodically cleaned. The measurements may be of short circuit current (Isc), maximum power (Pmax), or other electrical parameter conventionally used to evaluate performance of the photovoltaic device. A soiling ratio calculated as:SRPmax=1-Pmax2-Pmax3Pmax1or calculated as:SRIsc=1-Isc2-Isc3Isc1may be used to compare or monitor performance of the photovoltaic device between measurement cycles.