Connecting The Strings To The Inverter - SolarEdge Delta SE12.5K Installation Manual

30 Connecting the Strings to the Inverter
6. Connect the AC, as follows. Connect the PE (grounding) wire first.
Wire type
Line 1
Line 2
Line 3
Neutral
PE (grounding)
NOTE
If power control is enabled, it is important to respect the order of grid lines
connection to the inverter. A 120deg phase difference should be kept
between L1 to L2 and between L2 to L3 (L1-L2-L3 and not, for example L1-L3-
L2).
If the grid lines are not in this order, an error is displayed on the SetApp
screen and the inverter will not produce power.
7. Connect the wires to the appropriate terminal block connectors in the inverter.
Tighten the terminal block screws with a torque of 1.2-1.5 N*m / 0.88-1.1 lb*ft.
8. Check that the wires are fully inserted and cannot be pulled out easily.
9. Tighten the AC cable gland with a torque of 2.8-3.3 N*m / 2.0-2.4 lb*ft.
10. Verify that there are no unconnected wires to the inverter and that the unused
terminal screws are tightened.

Connecting the Strings to the Inverter

Connect the string to the DC input pairs. If required, connect additional strings in
parallel using an external combiner box/branch cables before connecting to the
inverter.
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.
Connect to
terminal
L1
L2
L3
N
Figure 13: AC Terminals
Three Phase System MAN-01-00505-1.5