SMA AUTOMATIC SWITCH BOX M - Manual (Page 19)

SMA Solar Technology AG Electrical Connection
Installation Guide AS-BoxM-IEN091711 19
5.3 Connecting the PV System
Cable Requirements
The cable type and laying method must be suitable for the application and use location. The cable
after the upstream fuse on the grid side must be selected.
For Sunny Backup systems with a generator connection, attention must also be paid to the fuse
protection of the generator feed-in. If the generator feed-in at the "X6/Generator" connection terminal
has a greater fuse protection than the supply cable from the feed-in meter
(upstream of "X5/PV Meter"), then the output cable from the PV System (X4/PV system) must be
implemented with this higher fuse value.
Cable Protection
The Automatic Switch Box S is not intended to serve as a distributor box or fuse box for the
PV system. For safety and disconnection, a line circuit breaker must be installed between
Automatic Switch Box and PV system. Be sure to observe all standards applicable to the
installation and site.
Connection of additional energy sources
Only those energy sources may be connected to the Automatic Switch Box for which the
corresponding tariff of the feed-in counter is valid. Instead of the PV system, you can also
connect other energy sources (e.g. small wind energy systems) to the Automatic Switch
Box. One prerequisite is the fact that a corresponding feed-in meter is connected to the
Automatic Switch Box.
Since only one feed-in meter may be connected to the Automatic Switch box, only one tariff
is specified. The connection of a PV system and a small wind energy system (energy
sources mix) is not possible.
Cable cross section