Installation Manual

Step 4: Verifying Proper Power Optimizer
Connection
Afteramoduleisconnectedtoapoweroptimizer,thepoweroptimizeroutputsasafevoltageof1V.
Therefore,thetotalstringvoltageshouldbeequalto1Vtimesthenumberofpoweroptimizers
connectedinseriesinthestring.Forexample,if10poweroptimizersareconnectedinastring,then10V
shouldbeproduced.
Makesurethemodulesareexposedtosunlightduringthisprocess;otherwise,thepoweroptimizersmay
notbepowered.Ifyouuseatracker,thepoweroptimizerwillturnONonlyifthetrackeristrackingthe
sunandthemoduleprovidesatleast2W.
InSolarEdgesystems,duetotheintroductionofpoweroptimizersbetweenthePVmodulesandthe
inverter,theshortcircuitcurrentI
SC
andtheopencircuitvoltageV
OC
holddifferentmeaningsfrom
thoseintraditionalsystems.
FormoreinformationabouttheSolarEdgesystem’sstringvoltageandcurrent,refertotheV
OC
andI
SC
in
SolarEdgeSystemsTechnicalNote,availableontheSolarEdgewebsiteat:
http://www.solaredge.us/files/pdfs/isc_and_voc_in_solaredge_systems_technical_note.pdf
To verify proper power optimizers connection:
Measurethevoltageofeachstringindividuallybeforeconnectingittotheotherstringsortotheinverter.
Verifycorrectpolaritybymeasuringthestringpolaritywithavoltmeter.Useavoltmeterwithatleast
0.1Vmeasurementaccuracy.
Fortroubleshootingpoweroptimizeroperationproblems,refertoPowerOptimizerTroubleshootingon
page88.
SolarEdge-StorEdge Installation Guide MAN-01-00262-1.0
16
Step 4: Verifying Proper Power Optimizer Connection