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6.4 External Grounding Connection
• Since the inverter is transformerless, neither the negative pole nor the positive
pole of the PV string can be grounded. Otherwise, the inverter will not operate
normally.
• Connect the external grounding terminal to the protective grounding point be-
fore AC cable connection, PV cable connection, and communication cable
connection.
• The ground connection of this external grounding terminal cannot replace the
connection of the PE terminal of the AC cable. Make sure those terminals are
both grounded reliably. Otherwise, SUNGROW shall not be held liable for any
damage caused by the violation.
6.4.1 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.
When there is only one inverter in the PV system, connect the external grounding cable to a
nearby grounding point.
When there are multiple inverters in the PV system, connect grounding points of all inverters
and the PV array frames to the equipotential cable (according to the onsite conditions) to im-
plement an equipotential connection.
6.4.2 Connection Procedure
There are two additional grounding terminals located at the bottom and right side of the in-
verter. Connect either one.
Additional grounding cable is prepared by customers.
step 1 Prepare the cable and OT/DT terminal.
User Manual 6 Electrical Connection
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