measure irradiance and temperature wirelessly when testing
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A_AP_MH006-E02© 2018 HIOKI E.E. CORPORATION
Power,Energy,Environment/Service,Maintenance�
MeasureIrradianceandTemperatureWirelesslywhenTestingPVInstallations �WirelesslycapturedatafromanirradiationsensorandathermocoupletoproperlyplottheI-Vcurveofsolarpanels�AnI-Vcurverepresentsthecurrentandvoltagecharacteristicsofaphotovoltaicstring,wherebyafaultypanelcanbedetectedbyobservingtheshapeofthecurve.ThebesttimetomeasurefortheI-Vcurveandcompareitagainstmanufacturerspecificationsiswhentheirradiancelevelandtemperatureisatstandardtestconditions(STC),butinpractice,thatisdifficult.Toaddressthisissue,thedatacapturedatthetimeofmeasurementcanbeconvertedtoSTCbyusingirradianceandtemperaturedatatoadjustthecurveandprovidemeaningfulresults.However,changesinirradianceandtemperatureduringanI-Vcurvemeasurementcaninfluencetheshapeofthecurve,andwhileoneI-Vcurvetracemaytakeonly1-2secondsperstring,capturingtheI-VcurveofcommercialorutilityscalePVsystemsconsistingof100sofpanelscanresultinlargeirradiationandtemperaturedifferencesbetweenthestartandendoftesting.Thisdoesnotincludethetimetomeasureindividualmoduleswhenissuesatthestringlevelaredetected.Toaidinpreventativeandperiodicmaintenance,aHiokiwirelessvoltageandtemperatureloggerandsolarsensorcanprovideacontinuouslogofthesetwocriticaldatapointstosupportaccurateI-VcurvetracinganytimebytransmittingthedatawirelesslytoyourmobiledeviceviaaBluetoothconnection.TheloggeddatacanbeusedtoeasilyconvertI-VcurvedatatoreflectSTCinordertoaccuratelyidentifyunder-performingpanels.■Highlights• Recordtheoutputfromapyranometer*andathermocoupleusingtheWirelessVoltage/TempLoggerLR8515.Use
thecaptureddatatocorrectIVcurvesandperformothermaintenanceandpreventivework.(*Afast-responsepyranometersuchasModelML-01fromEKOInstrumentsisrequired.)
• UsethescalingfunctionoftheLR8515toconvertthevoltageoutputofthepyranometertotheunitofmeasureforirradiation(W/m2)whenadjustingforSTC.
• EliminatetroublesomewiringofapyranometerandthermocoupledirectlytoanI-Vcurvetracertosavetime
Productsused �• WIRELESSVOLTAGE/TEMPLOGGERLR8515• Thermocouple• Irradiationsensororpyranometer
InformationvalidasofOctober2015.Specificationsaresubjecttochangeandrevisionwithoutnotice.�
Ø Forthelatestinformationaboutcountriesandregionswherewirelessoperationiscurrentlysupported,pleasevisittheHiokiwebsite.
Ø Bluetooth®isatrademarkofBluetoothSIG,Inc.andlicensedforusebyHIOKIE.E.CORPORATION.
Smartphone/Tablet
Fast-response
pyranometer
Thermocouple