0000000000594235

AUTHOR

Oscar Kwame Segbefia

showing 3 related works from this author

Moisture ingress in photovoltaic modules: A review

2021

Abstract Moisture ingress in photovoltaic (PV) modules is the core of most degradation mechanisms that lead to PV module power degradation. Moisture in EVA encapsulant can lead to metal grids corrosion, delamination and discolouration of encapsulants, potential induced degradation, optical and adhesion losses. The present work is a review of literature on the causes, effects, detection, and mitigation techniques of moisture ingress in PV modules. Literature highlights on determining the diffusivity, solubility, and permeability of polymeric components of PV modules via water vapour transmission rate tests, gravimetric, and immersion methods, have been presented. Electroluminescence, photolu…

Materials scienceMoistureRenewable Energy Sustainability and the Environment020209 energyDelaminationPhotovoltaic system02 engineering and technology021001 nanoscience & nanotechnologyThermal diffusivityPotential induced degradationCorrosionThermography0202 electrical engineering electronic engineering information engineeringDegradation (geology)General Materials ScienceComposite material0210 nano-technologySolar Energy
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Temperature profiles of field-aged multicrystalline silicon photovoltaic modules affected by microcracks

2021

In this work, the temperature sensitivities of field-aged multicrystalline silicon PV modules affected by microcracks are investigated. It is found that the temperature coefficient of efficiency of all modules has increased more than 10 times over the 20 years period, mainly due to a degradation in the temperature coefficients of fill factor. Temperature coefficient of efficiency of PV modules affected by microcracks changed from -0.44 %/ °C to -1.51 %/°C under solar irradiance conditions at 1010 - 1030 W/m2. Inconsistent values for the Evans–Floschuetz efficiency ratio versus temperature plots for the microcrack affected modules were also observed.

Work (thermodynamics)Materials scienceSiliconchemistryField (physics)Photovoltaic systemDegradation (geology)chemistry.chemical_elementFill factorComposite materialSolar irradianceTemperature coefficient2021 IEEE 48th Photovoltaic Specialists Conference (PVSC)
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Investigation of the Temperature Sensitivity of 20-Years Old Field-Aged Photovoltaic Panels Affected by Potential Induced Degradation

2022

One effect of moisture ingress on solar panels is potential induced degradation (PID). Solar panels affected by PID experience large leakage currents between the solar cells and the module’s frame, which leads to substantial power degradation. In the present work, the temperature coefficients of 3 old PV panels affected by PID were investigated. In the electroluminescence images, solar cells nearer to the edge of the modules appear darker due to ohmic shunting. IR thermal images acquired under clear sky outdoor conditions show that the majority of the warmer cells (hotspots) were located closer to the edge of the modules. The difference in cell temperature (∆T) due to PID effect…

Control and OptimizationRenewable Energy Sustainability and the EnvironmentVDP::Matematikk og Naturvitenskap: 400::Geofag: 450Energy Engineering and Power Technologypotential induced degradation; shunting; temperature coefficient; leakage current; field-agedElectrical and Electronic EngineeringEngineering (miscellaneous)Energy (miscellaneous)
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