Sungrow SG3KTL-EC User Manual page 46

5 Electrical Connection
2. Check the cable connection of PV strings for the correct polarity and that the
open-circuit voltage does not exceed the inverter input limit 1000 V, even
under the lowest operating temperature. Refer to module specification
supplied by module manufacturer for detailed information.
The inverter will not function properly if the DC polarities are reversed.
 Check the positive and negative polarity of the PV cells. After confirmation,
you can insert the DC connectors into the input terminals on the bottom of the
inverter.
 For the same MPPT, reverse connection of a single string is prohibited. A
permanent failure of the system or inverter may follow if otherwise.
3. Plug the positive and negative DC connectors into corresponding terminals
until there is an audible click.
Connect the same PV string to terminals of the same input areas. For
example, connect the positive pole of a string to DC1 input and the negative
pole to the DC1.
* Image shown here is for reference only. Actual product you receive may differ.
4. Connect other PV strings as the same procedures if necessary. Seal unused
DC terminals with the terminal caps.
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