Installation Manual

SMA Solar Technology America LLC 16 Multicluster Operation
Operating Manual SI4548-6048-US-BE-en-21 149
16.9 Error Handling in a Multicluster System
For Multicluster system operation, the entire main cluster is always required. If a device in the main
cluster fails (master and/or slave), this causes the main cluster to stop.
If the main cluster is stopped — whether due to a fault, or otherwise — this causes the extension clusters
to stop, and thus the entire Multicluster system.
For operation of an extension cluster, it is necessary that at least the master device (of the extension
cluster) is in operation. If a slave device in the extension cluster fails, this does not cause the master
device to stop.
The devices in an extension cluster are only started up if the respective device detects a voltage when
starting.
16.10 Grid Operation
The multicluster system is not certified for grid-tie use.
16.11 Generator Emergency Operation
If a Multicluster system fails, manual operation via the generator is possible. For this purpose, the
generator must be started manually, directly at the generator. As soon as a voltage is present, the
Multicluster Box connects the generator through to the loads, without a Sunny Island being in
operation.