Sungrow SG125HV-30, User Manual

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User Manual 5 Electrical Connection
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confirmation, you can insert the DC connectors into the input
terminals on the bottom of the inverter.

For the connection to the same MPPT, reversing the polarity of a
single string is prohibited. A permanent failure of the system or
inverter may occur.
Step 6
Pull the cable gently to make sure it is secured.
Step 7 Connect other PV strings following the above-mentioned procedures.
Step 8 Seal the gaps between the DC cable and the gland inside the lower part
of the cabinet with duct seal.
Seal the gap between the cable and the gland
/
conduit with duct seal
or other suitable materials to prevent the entry of foreign bodies or
moisture and ensure long-term and normal operation of the inverter.
5.4 Additional Grounding Connection
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.
5.4.1 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.