SMA SI 4548-US - Manual (Page 142)

16 Multicluster Operation SMA America, LLC
142 SI4548-6048-US-BE-en-20 Operating Manual
16 Multicluster Operation
16.1 Communication between the Sunny Island Inverters
For increased output, up to four Sunny Island clusters can be interconnected to form a Multicluster
system. A Multicluster Box for Sunny Island 4548-US / 5048-US / 6048-US (MCB-12U) is required
for such systems. Within each cluster, a communication interface connects the master to the slaves.
Each cluster is connected to the others via another communication interface connected to the
respective master.
The Multicluster Piggy-Back (MC-PB) is plugged into the Sunny Island at the external communication
slot. The scope of delivery of the Multicluster Piggy-Back includes a grounding cable. Lay the
grounding cable (B) as illustrated in the following figure:
Position Description
A Multicluster Piggy-Back (MC-PB)
B Grounding cable connection
C Cable route
Electrostatic Discharge
Electrostatic discharges are an acute danger to the Sunny Island and to the communication
interface.
• Ground yourself before removing the communication interface from the packaging, and
before touching any components within the Sunny Island. To achieve this, touch PE.