Designation:E2939−13StandardPracticeforDeterminingReportingConditionsandExpectedCapacityforPhotovoltaicNon-ConcentratorSystems1ThisstandardisissuedunderthefixeddesignationE2939;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesproceduresfordeterminingtheexpectedcapacityofaspecificphotovoltaicsysteminaspecificgeographicallocationthatisinoperationundernaturalsunlightduringaspecifiedperiodoftime.TheexpectedcapacityisintendedforcomparisonwiththemeasuredcapacitydeterminedbyTestMethodE2848.1.2ThispracticeisintendedforusewithTestMethodE2848asaproceduretoselectappropriatereportingconditions(RC),includingsolarirradianceintheplaneofthemodules,ambienttemperature,andwindspeed,neededforthephoto-voltaicsystemcapacitymeasurement.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E772TerminologyofSolarEnergyConversionE2848TestMethodforReportingPhotovoltaicNon-ConcentratorSystemPerformance2.2IEEEStandards:3IEEE1547-2003StandardforInterconnectingDistributedResourceswithElectricPowerSystems3.Terminology3.1DefinitionsoftermsusedinthispracticemaybefoundinTerminologyE772,IEEE1547-2003,andTestMethodE2848.3.2Definitions:3.2.1expectedcapacity,photovoltaicsystem,n—thepre-dictedpowerratingthatisderivedfrommeteorologicaldataandaperformancemodelthatdescribesaspecificPVsysteminaspecificlocationandtimeperiod.3.2.2measuredcapacity,photovolaicsystem,n—theoutputpowerofaphotovoltaicsystemmeasuredaccordingtoTestMethodE2848.3.2.3perform...
