Sungrow SG320HX, User Manual

Page: 53 / 127

43
Ensure that the selected terminal can directly contact with the copper bar. If there
are any problems, contact the terminal manufacturer.
Ensure that the copper bar is not in direct contact with the aluminum wire. Other-
wise, electrochemical corrosion may occur, impairing the reliability of electrical
connection.
5.5 External Grounding Connection
Electric shock!
• Make sure that the ground cable is connected reliably. Otherwise, it may cause
electric shock.
• Since the inverter is not equipped with a transformer, neither the negative elec-
trode nor the positive electrode of the PV string can be grounded. Otherwise,
the inverter will not operate normally.
• Connect the grounding terminal to the protective grounding point before AC ca-
ble connection, PV string connection, and communication cable connection.
The external protective grounding terminal must meet at least one of the following
requirements.
• The cross-sectional area of the AC side grounding cable is not less than 10
mm
2 for copper wire or 16 mm 2 for aluminum wire. It is recommended that both
the external protective grounding terminal and the AC side grounding terminal
be reliably grounded.
• If the cross-sectional area of the AC side grounding cable is less than 10 mm 2
for copper wire or 16 mm 2 for aluminum wire, ensure that both the external pro-
tective grounding terminal and the AC side grounding terminal are reliably
grounded.
The grounding connection can be made by other means if they are in accordance
with the local standards and regulations, and SUNGROW shall not be held liable
for the possible consequences.
5.5.1 External Grounding Requirements
All non-current carrying metal parts and device enclosures in the PV power system should
be grounded, for example, brackets of PV modules and inverter enclosure.
User Manual 5 Electrical Connection