Sungrow SG125HV, User Manual

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User Manual 6 Electrical Connection
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moisture and ensure long-term and normal operation of the inverter.
6.4 Grounding the Inverter
Due to the transformer-less design of the inverter, neither the DC
positive pole nor the DC negative pole of the PV string can be
grounded.
6.4.1 Grounding System Overview
In this PV system, all non-current carrying metal parts and device enclosure
should be grounded (such as the PV array frame and inverter enclosure).
When there is only one inverter in the PV system, ground the PE cable.
When there are multiple inverters in the PV system, they can be multi-point
grounded. Connect PE cables of all inverters and the mounting metal frames of
PV array to the equipotential cable (according to the on-site conditions ) to
implement an equipotential connection.