Installation Manual

2.
Connecttherestofthepoweroptimizersinthestringinthesamemanner.
WARNING!
If using a dual-input power optimizer and some inputs are not used, seal the unused input
connectors with the supplied pair of seals.

Figure 9: Power optimizers connected in series
3.
Ifyouintendtomonitortheinstallation,usingthemonitoringplatform,recordthephysicallocation
ofeachpoweroptimizer,asdescribedinProvidingInstallationInformationonpage36.
Step 4: Verifying Proper Power Optimizer
Connection
Whenamoduleisconnectedtoapoweroptimizer,thepoweroptimizeroutputsasafevoltageof1V
(±0.1V).Therefore,thetotalstringvoltageshouldequal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PVmodulesareexposedtosunlightduringthisprocess.Thepoweroptimizerwillonlyturn
ONifthePVmoduleprovidesatleast2W.
InSolarEdgesystems,duetotheintroductionofpoweroptimizers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 optimizer 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.
NOTE
Since the inverter is not yet operating, you may measure the string voltage and verify correct polarity
on the DC wires inside the Connection Unit.
Fortroubleshootingpoweroptimizeroperationproblems,refertoPowerOptimizerTroubleshootingon
page68.
Single Phase Inverter with HD-Wave Technology Installation MAN-01-00306-1.1
22
Step 4: Verifying Proper Power Optimizer Connection