Step 4: Verifying Proper Power Optimizer Connection - SolarEdge StorEdge Installation Manual

Step 4: Verifying Proper Power Optimizer Connection

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 and the open circuit voltage V hold different meanings from
SC OC
those in traditional systems.
For more information about the SolarEdge s ystem's string voltage and current, refer to the V and I in
OC SC
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.
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SolarEdge-StorEdge Installation Guide MAN-01-00262-1.0