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Jay A. Kratochvil
Sandia National Laboratories
Electrical engineeringPhysicsPhotovoltaic systemOptoelectronicsSolar energy
21Publications
10H-index
1,448Citations
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Publications 19
Newest
#1Anthony L. LentineH-Index: 1
#2Gregory N. NielsonH-Index: 16
Last. Tian GuH-Index: 7
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Jun 1, 2013 in PVSC (Photovoltaic Specialists Conference)
#1Daniel Riley (SNL: Sandia National Laboratories)H-Index: 8
#2Joshua S. Stein (SNL: Sandia National Laboratories)H-Index: 15
Last. Jay A. Kratochvil (SNL: Sandia National Laboratories)H-Index: 10
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Photovoltaic (PV) modules with attached microinverters are becoming increasingly popular in PV systems, especially in the residential system market, as such systems offer several benefits not found in PV systems utilizing central inverters. PV modules with fully integrated microinverters are emerging to fill a similar market space. These “AC modules” absorb solar energy and produce AC energy without allowing access to the intermediate DC bus. Existing test procedures and performance models desig...
3 CitationsSource
Jun 19, 2011 in PVSC (Photovoltaic Specialists Conference)
#1Jennifer E. Granata (SNL: Sandia National Laboratories)H-Index: 9
#2William E. Boyson (SNL: Sandia National Laboratories)H-Index: 11
Last. Larry PrattH-Index: 5
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Sandia National Laboratories (Sandia) has observed an increased demand for high accuracy outdoor photovoltaic (PV) module characterization using Sandia's Photovoltaic Array Performance Model [1]. To meet this demand, Sandia entered into a competitively-bid agreement in May 2009 with TUV Rheinland Photovoltaic Testing Laboratory (TUV-PTL) to transfer Sandia's capability to fully characterize standard, commercial-scale PV modules. Sandia and TUV-PTL worked closely on two round-robin experiments an...
6 CitationsSource
Jun 19, 2011 in PVSC (Photovoltaic Specialists Conference)
#1Clifford W. Hansen (SNL: Sandia National Laboratories)H-Index: 15
#2Joshua S. Stein (SNL: Sandia National Laboratories)H-Index: 15
Last. David L. King (SNL: Sandia National Laboratories)H-Index: 31
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The Sandia Array Performance Model (SAPM) [1] describes the power performance of photovoltaic (PV) modules under variable irradiance and temperature conditions. Model parameters are estimated by regressions involving measured module voltage and current, module and air temperature, and solar irradiance. Measurements are made under test conditions chosen to isolate subsets of parameters and which improve the quality of the regression estimates. Uncertainty in model parameters results from uncertai...
8 CitationsSource
#2Jay A. KratochvilH-Index: 10
Last. Larry PrattH-Index: 5
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1 Citations
Jun 7, 2009 in PVSC (Photovoltaic Specialists Conference)
#1Jennifer E. Granata (SNL: Sandia National Laboratories)H-Index: 9
#2William E. Boyson (SNL: Sandia National Laboratories)H-Index: 11
Last. Michael A. Quintana (SNL: Sandia National Laboratories)H-Index: 9
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In the last decade, c-Si module degradation rates of ≪1%/year have been reported [1–3]. It is unclear if this degradation rate extends directly to the string level and what is the expected statistical spread of degradation rates. Nine photovoltaic (PV) arrays totaling nearly 100 kW at Standard Reporting Conditions are currently being used at Sandia National Laboratories (SNL) primarily for inverter testing. The measured power degradation of these arrays at the string level varied from no change ...
30 CitationsSource
#1Jay A. KratochvilH-Index: 10
Last. Michael A. QuintanaH-Index: 9
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2 Citations
#1A. Hunter Fanney (NIST: National Institute of Standards and Technology)H-Index: 10
#2Mark W. Davis (NIST: National Institute of Standards and Technology)H-Index: 10
Last. Jay A. Kratochvil (SNL: Sandia National Laboratories)H-Index: 10
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Computer simulation tools used to predict the energy production of photovoltaic systems are needed in order to make informed economic decisions. These tools require input parameters that characterize module performance under various operational and environmental conditions. Depending upon the complexity of the simulation model, the required input parameters can vary from the limited information found on labels affixed to photovoltaic modules to an extensive set of parameters. The required input ...
64 CitationsSource
#1A. Hunter FanneyH-Index: 10
#2Mark W. DavisH-Index: 10
Last. Jay A. KratochvilH-Index: 10
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#1Jay A. KratochvilH-Index: 10
#2B.R. HansenH-Index: 8
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