SMA AUTOMATIC SWITCH BOX XL - Manual (Page 27)

SMA Solar Technology AG Electrical Connection
Installation Guide AS-BOX-XL-IEN094410 27
5.4.2 Connecting the PV System
Cable Sizing
The cable type and routing method must be suitable for the application and the deployment location.
Select the cable according to the upstream fuse on the grid side.
For a Sunny Backup-System with a generator, also pay attention to the fuse protection rating of the
generator feed-in. If the generator feed-in at the "1_1-F6 Generator" connection terminal has a higher
fuse rating than the supply cable from the feed-in meter (upstream of "AS-X5 PV Meter"), you need to
dimension the output cable from the PV system (AS-X4 PV System) according to this higher fuse value.
Cable protection
The Automatic Switch Box does not replace the distributor box or fuse box of the PV system
(PV main distributor).
Install a load disconnection unit and a corresponding fuse element between the Automatic
Switch Box and the PV system. Be sure to observe all standards and guidelines applicable
to 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 Automatic Switch Box. In any case, make sure that a counter with the
corresponding tariff is connected to the Automatic Switch Box.
Mixing energy sources (e.g., connection of a PV system and a small wind turbine system)
is not permitted by the utility operator, as the feed-in tariff for each energy source is
different.