SMA MC-Box 6.3 - Manual (Page 27)

SMA Solar Technology AG 6 Electrical Connection
Operating Manual MC-BOX-6_12-BE-en-20 27
6.3.3 Connecting the PV System
Cable dimensioning:
In the event of a short circuit, short-circuit currents occurring in the generator will flow via the
unprotected cable between the Multicluster Box and PV main distribution. If the generator fuse is
larger than the fuse in the PV main distribution board, the cables must be dimensioned for the
generator fuse.
When planning the short-circuit protection of cables, the PV inverters and Sunny Island inverters may
be disregarded, as their construction precludes any danger to cables in case of short circuits.
Overload protection is guaranteed if the connection cables to the PV system are at least dimensioned
for the feed-in power of the PV system.
Cable requirement:
☐ Conductor material: copper
Cable protection
The Multicluster Box does not replace the distribution board of the PV system (PV main
distribution board). Install a circuit breaker and if necessary a residual-current device between
the Multicluster Box and the PV system for protection and disconnection purposes. Make sure
to observe all standards and directives applicable at the installation site.
Connecting other energy sources
Instead of a PV system, you can connect other energy sources (e.g. small wind turbine systems)
to the Multicluster Box.