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  • 1985-1989  (7)
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  • 1
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    Electrochemical degradation of amorphous-silicon photovoltaic modules (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Techniques of module electrochemical corrosion research, developed during reliability studies of crystalline-silicon modules (C-Si), have been applied to this new investigation into amorphous-silicon (a-Si) module reliability. Amorphous-Si cells, encapsulated in the polymers polyvinyl butyral (PVB) and ethylene vinyl acetate (EVA), were exposed for more than 1200 hours in a controlled 85 C/85 percent RH environment, with a constant 500 volts applied between the cells and an aluminum frame. Plotting power output reduction versus charge transferred reveals that about 50 percent a-Si cell failures can be expected with the passage of 0.1 to 1.0 Coulomb/cm of cell-frame edge length; this threshold is somewhat less than that determined for C-Si modules.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electrochemical aging effects in photovoltaic modules (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Leakage currents were experimentally measured in PV modules undergoing natural aging outdoors, and in PV modules undergoing accelerated aging in laboratory environmental chambers. The significant contributors to module leakage current were identified with a long range goal to develop techniques to reduce or stop module leakage currents. For outdoor aging in general, module leakage current is relatively insensitive to temperature fluctuations, but is very sensitive to moisture effects such as dew, precipitation, and fluctuations in relative humidity. Comparing ethylene vinyl acetate (EVA) and polyvinyl butyral (PVB), module leakage currents are much higher in PVB as compared to EVA for all environmental conditions investigated. Leakage currents proceed in series along two paths, bulk conduction followed by interfacial (surfaces) conduction.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proceedings of the 26th Project Integration Meeting; p 629-645
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Module voltage isolation and corrosion research (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A summary of recent research at JPL on two topics related to achieving long term reliability of photovoltaic modules: voltage isolation and electrochemical corrosion is presented. Special emphasis is given to similarities and differences in performance between crystalline silicon modules and amorphous silicon modules.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Reliability and Eng. of Thin-Film Photovoltaic Modules; p 197-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Moisture-temperature degradation in module encapsulants: The general problem of moisture in photovoltaic encapsulants (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A general research approach was outlined toward understanding water-module interactions and the influence of temperature involving the need to: quantify module performance loss versus level of accumulated degradation, establish the dependence of the degradation reaction rate on module moisture and temperature levels, and determine module moisture and temperature levels in field environments. These elements were illustrated with examples drawn from studies of the now relatively well understood module electrochemical degradation process. Research data presented include temperature and humidity-dependent equilibrium leakage current values for multiparameter module material and design configurations. The contributions of surface, volume, and interfacial conductivities was demonstrated. Research directions were suggested to more fully understand the contributions to overall module conductivity of surface, volume, and interfacial conductivities over ranges of temperature and relative humidity characteristic of field environments.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proceedings of the 25th Project Integration Meeting; p 191-199
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    NASA TECHNICAL REPORTS
  • 5
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    Predicting the Reliability of Solar-Cell Interconnections (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The reduction of life expectancy by thermal cycling calculated during design. Connections between solar cells critical parts of solarcell arrays generating electric power. Reliability affects life expectancy of modules, panels, and arrays. Used to predict stress-cycle lifetimes of such structures as arches, walkways, cylindrical ribbing of aircraft fuselages and submarine hulls, and pipeline expansion loops. Testing costs reduced by about 90 percent.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: NPO-15976 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 574
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Electrical isolation design and electrochemical corrosion in thin-film photovoltaic modules (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The development of a proposed wet insulation-resistance qualification test specification for production-line modules is presented. Laboratory research directed toward understanding and eliminating problems associated with electrical isolation of thin-film photovoltaic module circuitry is presented. Test results serve to measure module field life as limited by electrochemical corrosion degradation mechanisms. Current module-level research covering encapsulant voltage withstand capability is also described, and suggestions for improving module electrical isolation are offered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; Sept. 26-30, 1988; Las Vegas, NV; United States
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    NASA TECHNICAL REPORTS
  • 7
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    Corrosion of a-Si cells and modules (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors report on corrosion/erosion phonemena observed in exposing a-Si cells, modules, and specially designed test structures to natural and accelerated test environments. Relevant cell and module I-V curve data used for monitoring degradation are presented. The causes of the observed degradation, methods of mitigation, and consequences for fielded modules are discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; May 04, 1987 - May 08, 1987; New Orleans, LA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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