Effective efficiency of PV modules under field conditions
Identifieur interne : 007B66 ( Main/Repository ); précédent : 007B65; suivant : 007B67Effective efficiency of PV modules under field conditions
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Abstract
The conversion efficiency of photovoltaic modules varies with irradiance and temperature in a predictable fashion, and hence the effective efficiency averaged over a year under field conditions can be reliably assessed. The suggested procedure is to define the efficiency versus irradiance and temperature for a specific module, collect the local irradiance and temperature data, and combine the two mathematically, resulting in effective efficiency. Reasonable approximations simplify the process. The module performance ratio is defined to be the ratio of effective efficiency to that under standard test conditions. Variations of the order of 10% in this factor among manufacturers, primarily the result of the differences in effective series resistance and leakage conductance, are not unusual. A focus on these parameters that control the effective efficiency should provide a path to PV modules with improved field performance.
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The suggested procedure is to define the efficiency versus irradiance and temperature for a specific module, collect the local irradiance and temperature data, and combine the two mathematically, resulting in effective efficiency. Reasonable approximations simplify the process. The module performance ratio is defined to be the ratio of effective efficiency to that under standard test conditions. Variations of the order of 10% in this factor among manufacturers, primarily the result of the differences in effective series resistance and leakage conductance, are not unusual. A focus on these parameters that control the effective efficiency should provide a path to PV modules with improved field performance.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1062-7995</s0></fA01><fA03 i2="1"><s0>Prog. photovolt.</s0></fA03><fA05><s2>15</s2></fA05><fA06><s2>1</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Effective efficiency of PV modules under field conditions</s1></fA08><fA11 i1="01" i2="1"><s1>TOPIC (Marko)</s1></fA11><fA11 i1="02" i2="1"><s1>BRECL (Kristijan)</s1></fA11><fA11 i1="03" i2="1"><s1>SITES (James)</s1></fA11><fA14 i1="01"><s1>Faculty of Electrical Engineering, University of Ljubljana</s1><s2>Ljubljana</s2><s3>SVN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA14 i1="02"><s1>Department of Physics, Colorado State University</s1><s2>Fort Collins, CO 80523</s2><s3>USA</s3><sZ>3 aut.</sZ></fA14><fA20><s1>19-26</s1></fA20><fA21><s1>2007</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>26755</s2><s5>354000143232090020</s5></fA43><fA44><s0>0000</s0><s1>© 2007 INIST-CNRS. 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