SolarEdge SE66.6KUS - Verifying Connection

Step 4: Verifying Proper Power Optimiser
Connection
Whenamoduleisconnectedtoapoweroptimiser,thepoweroptimiseroutputsasafevoltageof1V
(±0.1V).Therefore,thetotalstringvoltageshouldequal1Vtimesthenumberofpoweroptimisers
connectedinseriesinthestring.Forexample,if10poweroptimisersareconnectedinastring,then10V
shouldbeproduced.
MakesurethePVmodulesareexposedtosunlightduringthisprocess.Thepoweroptimiserwillonlyturn
ONifthePVmoduleprovidesatleast2W.
InSolarEdgesystems,duetotheintroductionofpoweroptimisers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:
https://www.solaredge.com/sites/default/files/isc_and_voc_in_solaredge_sytems_
technical_note.pdf.
To verify proper power optimiser 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optimiseroperationproblems,refertoPowerOptimizerTroubleshootingon
page72.
Chapter 2: Installing the Power Optimisers
-Three Phase Inverter with Synergy Technology Installation MAN-01-00402-1.4
21