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5.5 External Protective Grounding Connection
Electric shock!
• There are large currents during the inverter's operation. If the inverter is pow-
ered on and put into operation without being grounded, it may lead to electric
shock hazards or failures of major protective functions such as surge protec-
tion. Therefore, before powering on the inverter, make sure it has been reliably
grounded; otherwise, damages caused therefrom will not be covered by
warranty.
• When performing electrical connections of the inverter, give the highest priority
to grounding. Be sure to carry out the grounding connection first.
• 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.
• Depending on Local Rules, please also ground the PV panel subconstruction to
the same common grounding point (PE Bar) in addition to local lightning pro-
tection rules.
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 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 Electrical Connection User Manual
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