SMA ST6-US User Manual
Page 36
Electrical connection
SMA America, LLC
36
ST36-48US-IA-IUS112321
Installation Guide
AC wiring for 277 V/480 V grid configuration
1. Connect the white wire of the AC/DC disconnect to the terminal labeled N and the black wire
to the terminal labeled L1 of the Sunny Boy.
2. For 277 V/480 V connect the blue wire to the terminal labeled PE in the Sunny Boy (not used).
3. Connect the wires to the terminal blocks in the Sunny Boy and tighten to a torque of 18 in lb
(2 Nm).
4. Verify that all connections are correctly wired and properly torqued.
☑ The Sunny Boy is connected to the 277 V/480 V grid.
5. Repeat steps 1 to 4 for the AC wiring of the remaining Sunny Boy inverters.
Position
Description
A
Blue wire connected to PE terminal
B
Black wire connected to L1 terminal
C
White wire connected to N terminal