Step 3: Verifying Proper Power Optimiser Connection
When a panel 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 PVpanels are exposed to sunlight during this process. The power
optimiser will only turn ON if the PV panel provides at least 2W.
In SolarEdge systems, due to the introduction of poweroptimisers between the PV
panels 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_
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 with Safety
Switch.
For troubleshooting power optimiser operation problems, refer to
Chapter 2: Installing the Power Optimisers
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