SMA ST6-US User Manual
Page 50
Commissioning the Sunny Tower
SMA America, LLC
50
ST36-48US-IA-IUS112321
Installation Guide
Inserting the fuses for 208 V/240 V grid configuration
1. Turn each AC/DC disconnector to "0" (off).
2. If the Sunny Tower is to be used in a 208 V/240 V installation insert both fuses.
3. Ensure that all DC string fuse holders are closed.
Inserting the fuses for 277 V/480 V grid configuration
1. Turn each AC/DC disconnector to "0" (off).
2. If the Sunny Tower is to be used in a 277 V/480 V installation insert one fuse only.
3. Ensure that all DC string fuse holders are closed.
T
When inserting the fuses provided with the Sunny Tower, you must consider the local grid
configuration and voltage! If the Sunny Tower is to be used in a 277 V/480 V 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).
The maximum allowable fuse size for the DC string fuses is 15 amps. Fuse must be fast
acting (for example: Ferraz ATM15, Bussman KTK15, Littelfuse KLK15).