Step 4: Verifying Proper Power Optimiser Connection - SolarEdge SE66.6KUS Installation Manual

Step 4: Verifying Proper Power Optimiser
Connection
When a module 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 PV modules are exposed to sunlight during this process. The power optimiser will only t urn
ON if t he PV module provides at least 2W.
In SolarEdge systems, due to the introduction of poweroptimisers 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
https://www.solaredge.com/sites/default/files/isc_and_voc_in_solaredge_sytems_
technical_note.pdf .
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.
For troubleshooting power optimiser operation problems, refer to Power Optimizer Troubleshooting on
page 72.
-Three Phase Inverter with Synergy Technology Installation MAN-01-00402-1.4
and the open circuit voltage V
SC
Chapter 2: Installing the Power Optimisers
hold different meanings from
OC
21