SMA ST6-US - Manual (Page 32)

Electrical connection SMA America, LLC
32 ST36-48US-IA-IUS112321 Installation Guide
7.5 Installing the inverters on the Sunny Tower
Installing the mounting brackets (A) for the Sunny Boy
1. Hold the mounting bracket (A) over the corresponding screw anchor holes of the Sunny Tower.
2. Fasten the mounting bracket (A) using the metric threaded stainless steel screws (M8 x 16 mm
with corresponding locking washers) provided with the Sunny Tower.
3. Perform these steps again for installing the remaining mounting brackets.
4. Refer to the SB 6000US/SB 7000US/SB 8000US manual for further installation instructions.
DC Fuse
The maximum allowable fuse size for the DC string fuses is 20 A. Fuse must be fast acting.
Fuses are provided with the Sunny Tower. The proper size PV string fuse is determined by
1.56 x Isc (of the PV module) and then rounding up to the next standard fuse size.
Example: If the Isc of the PV module = 6.9 Adc then the fuse size is determined by
1.56 x 6.9 = 10.76. The next standard fuse size would be 12 A, 600 Vdc fuse.
The string fuse size must not be greater than the maximum fuse size rating of the PV module.
The Sunny Tower must be securely fastened to the floor prior to installing and connecting
the inverters.