Step 4: Verifying Proper Power Optimizer Connection - SolarEdge Delta SE12.5K Installation Manual

18 Step 4: Verifying Proper Power Optimizer Connection

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 power optimizers between the PV
modules and the inverter, the short circuit current I
hold different meanings from those in traditional systems.
For more information about the SolarEdge system's string voltage and
current, refer to the V
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 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 DC Safety Unit.
For troubleshooting power optimizer operation problems, refer to Power Optimizer
Troubleshooting on page 52.
and I in SolarEdge Systems Technical Note ,
OC SC
and the open circuit voltage V
SC
Three Phase System MAN-01-00505-1.5
OC