Sungrow SG125HV-30, User Manual

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5 Electrical Connection User Manual
38
L 1 L 2 L 3
M1 M2 M3
M4
500V 500V 500V
750V
Fig. 5-2 The schematic diagram of AC SPD
5.2.2 Grid Connection
The AC terminal block is on the bottom of the inverter. AC connection is the
three-phase-three-wire grid +PE connection (L1, L2, L3 and PE).
AC Cable Requirements
Select AC cables according to the following factors:

Grid impedance complies with the specifications below to avoid accidental
shortcircuit or output power derating.
600 615 630 645 660 675 690
0
0.15
M
ax
. g
rid
im
pe
da
nc
e
(O
hm
)
AC voltage without loads (V)
0.3
0.45
0.6
0.43

Considering the voltage drop and other conditions, please enlarge the cable
dimension. Power loss of the cable should be less than 1% of the nominal
power.

Withstand ambient temperature.

Cable layout and installation conditions (inside wall, underground, free air,
etc.)

UV resistance and so on.