Step 4: Verifying Proper Power Optimizer Connection - SolarEdge SE50K Installation Manual

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.
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 t urn
ON if t he PV 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
those in traditional systems.
For more information about the SolarEdge s ystem's string voltage and current, refer to
the V and I in SolarEdge Systems Technical Note, available on the SolarEdge website at:
OC SC
http://www.solaredge.com/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.
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 70.
Extended Power Commercial Inverter Installation Guide MAN-01-00402-1.0
and the open circuit voltage V
SC
Chapter 2: Installing the Power Optimizers
hold different meanings from
OC
17