31
•
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 external protective grounding point be-
fore AC cable connection, PV string connection, and communication cable
connection.
•
The external protective grounding point provides a reliable ground connection.
Do not use an improper grounding conductor for grounding, Otherwise, it may
cause product damage or personal injury.
The external protective grounding terminal must meet at least one of the following
requirements.
•
The cross-sectional area of the grounding cable is not less than 10 mm
2
for cop-
per 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 grounding cable is less than 10 mm
2
for copper
wire or 16 mm
2
for aluminum wire, ensure that both the external protective
grounding terminal and the AC side grounding terminal are reliably grounded.
The external protective grounding point provides a reliable ground connection. Do
not use an improper grounding conductor for grounding, Otherwise, it may cause
product damage or personal injury.
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.
5.4.1 External Protective 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.
When there is only one inverter in the PV system, connect the external protective grounding
cable to a nearby grounding point.
When there are multiple inverters in the PV system, connect the external protective ground-
ing terminals of all inverters and the grounding points of the PV module brackets to ensure
equipotential connections to ground cables (according to the onsite conditions).
5.4.2 Connection Procedure
External grounding cable and OT/DT terminal are prepared by customers.
step 1 Prepare the cable and OT/DT terminal.
User Manual
