SMA ST6-US - Manual (Page 39)

SMA America, LLC Electrical connection
Installation Guide ST36-48US-IA-IUS112321 39
Negative grounding
Following figure shows the DC connection with negative grounding.
1. Connect the black wire (PV HOT) to the terminal labeled DC+ in the Sunny Boy.
2. Connect the white wire (PV RETURN) to the terminal labeled DC − in the Sunny Boy.
3. Torque all wires in the terminal blocks inside the Sunny Boy to 18 in lb (2 Nm).
4. Verify that all connections are correctly wired and properly torqued.
☑ The Sunny Boy is DC wired with negative grounding.
5. Repeat steps 1 to 4 for DC wiring with negative grounding for the remaining Sunny Boy
inverters.
Position Description
A White wire (PV RETURN) connected to DC −
B Black wire (PV HOT) connected to DC+