Step 4: Verifying Proper Power Optimiser 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 PVmodules are exposed to sunlight during this process. The power
optimizer will only turn ON if the PVmodule 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:
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 65.
Chapter 2: Installing the Power Optimizers 19
Three Phase System Installation Guide MAN-01-00505-1.2
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