SMA ST6-US - Manual (Page 28)

Electrical connection SMA America, LLC
28 ST36-48US-IA-IUS112321 Installation Guide
7.3 Connecting the AC output
1. Turn OFF the main breaker in the main utility box.
2. Ensure that the correct breaker sizes specified in the table below are installed.
AC Fuse
When inserting the fuses provided with the ST36/ST42/ST48 you must consider the local
grid configuration and voltage! If the Sunny Tower is to be used in a 480/277 volt
installation, the fuses for the L2 connections of each inverter must not be installed. These
fuse holders are marked with yellow warning labels on the fuse holders inside the Sunny
Tower.
Maximum Inverter AC output fuse size is 50 A, Fuse must be fast acting Class J
(for example: Ferraz A4J50, Bussman JKS-50, Littelfuse JLS-50).
Ensure that the Sunny Tower is properly grounded and the bonding of your equipment is
in accordance with NEC articles 250 and 690.
AC-output/neutral is not bonded to ground!
Inverter Type Grid Configuration Breaker Size
SB 8000US 480 V/277 V 80 A
SB 8000US 240 V 150 A
SB 7000US 480 V/277 V 70 A
SB 7000US 208 V/120 V 150 A
SB 7000US 240 V 150 A
SB 6000US 480 V/277 V 60 A
SB 6000US 208 V/120 V 125 A
SB 6000US 240 V 110 A
Ensure that conductors are sized in accordance with NEC article 310.