SMA MULTICLUSTER BOX 12 - Manual (Page 23)

SMA Solar Technology AG 6 Electrical Connection
Operating Manual MC-BOX-12-3-20-BE-en-10 23
6.7 Connecting the Sunny Island Inverters
Figure 11: Overview of the spring-cage terminals for connecting the power cables
Cable requirement:
☐ Conductor material: copper
Procedure:
1. Insert the power cables into the Multicluster Box (see Section 9.3.1, page 31).
2. Connect the line conductors, the neutral conductors and the grounding conductors of all Sunny Island inverters to
the spring-cage terminals X105 for the Sunny Island inverters (see Section 9.4.1, page 34).
6.8 Grounding the Multicluster System
The neutral conductors inside the Multicluster Box are not connected to the grounding conductor by default. To ensure
safe operation of the multicluster system, you must perform the following action prior to commissioning:
Cable requirement:
☐ Conductor material: copper
Procedure:
• Ground the multicluster system outside the Multicluster Box on the generator side. To do this, connect the neutral
conductor to the grounding conductor, observing all standards and directives applicable at the installation site.
Position Explanation
A Terminal for the power cables of the main cluster
B Terminal for the power cables of extension cluster 1
C Terminal for the power cables of extension cluster 2
D Terminal for the power cables of extension cluster 3
Fusing of the Sunny Island inverter
The power cables of each Sunny Island inverter are fused with a 40 A circuit breaker inside the Multicluster Box.