9. Verify that all wires inside the DC Safety Unit and inverter are firmly tightend to the
terminal blocks. Check that the wires are fully inserted and cannot be pulled out
easily. Ensure that unused terminal block screws are tightened.
10. Close the inverter cover and tighten the screws with a torque of 10.3 N*m / 7.6 ft.*lb.
11. Close the DC Safety Unit cover and tighten the screws with a torque of 9 N*m / 6.6
lb*ft.
Connecting the PV Strings to the Inverter
Connect the PV string to the DC input pairs. For PV strings connection, the inverter is
equipped with MC4 DCconnectors. Inverters with the DC Safety Unit, may have MC4
connectors or glands for PV string connection. Additional PV strings can be added to
the system by parallel connection using an external combiner box or branch cables.
Installation and connection of the combiner box must be done before connecting to
the inverter or DC Safety Unit.
When wiring an inverter with glands, the cross section of the conductor of the DC wires
must be 4 mm² to 16 mm². When using a stranded wire, the use of ferrule is at installer
discretion.
NOTE
Functional electrical earthing of DC-side negative or positive poles is prohibited
because the inverter has no transformer. Grounding (earth ground) of module
frames and mounting equipment of the PV array modules is acceptable.
NOTE
SolarEdge’s fixed input voltage architecture enables the parallel strings to be of
different lengths. Therefore, they do not need to have the same number of
power optimizers, as long as the length of each string is within the permitted
range.
Connecting the Strings to the Inverter or DC Safety Unit MC4
Connectors
When using inverter models above SE25K, the total length of extension cables used in a
single PV string should not exceed 700m.
To connect the strings to the inverter or DC Safety Unit with MC4 connectors:
1. Turn OFF the AC circuit breaker.
2. Turn OFF the DC switch of the DC Safety Unit (if applicable).
3. Turn OFF the ON/OFF/P switch of the inverter.
Chapter 4: Connecting AC and PVStrings to the Inverter 36
Three Phase Inverter with SetApp Configuration PN: SEXXK-XXXXIXXXX
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