SMA AUTOMATIC SWITCH BOX XL - Manual (Page 37)

SMA Solar Technology AG Electrical Connection
Installation Guide AS-BOX-XL-IEN094410 37
5.4.7 Connecting a Generator (Optional)
You can connect a three-phase generator, such as a diesel generator or another grid-forming current
generator, to the Automatic Switch Box.
The phases L1, L2, and L3 are led through fuse elements in the Automatic Switch Box. The fuse plugs
are designed for a nominal current of 160 A.
Determine the required fuse size according to the cable routing method and installation conditions,
and install the appropriate fuse plugs. The maximum usable fuse plugs (160 A) are factory-installed
in the respective fuse element.
Cable Sizing
The cable type and routing method must be suitable for the application and the deployment location.
CAUTION!
Risk of burns when opening and closing the fuse load disconnector (NH load
disconnector) under load.
Opening or closing the fuse load disconnector (NH load disconnector) under load causes
sparking.
• Wear personal protective equipment.
ATTENTION!
Destruction of the cable due to overload.
• Select the required cable cross section according to the nominal power of the
generator.
• The size of the output fuse of the generator may affect the sizing of the cable to the
PV system.
• If the generator does not have an output fuse, execute the cable connection to the
Automatic Switch Box with ground-fault and short-circuit protection. As an alternative
- especially for long cable distances - you can install additional fusing close to the
generator.