Testing Multicluster Communication; Automatic Frequency Synchronization; Firmware Update - SMA SUNNY ISLAND 4548-US Operating Manual

16 Multicluster Operation
Nominal capacity of the battery storage systems
Ideally, the various battery banks should all have the same nominal capacity.
If the nominal capacity varies by up to 30%, a similar average state of charge is ensured via
the equalization function. However, the smallest battery is then cycled more intensively. The
nominal power and overload capacity are no longer the value of an individual device multiplied
by the number of devices. Instead, it is 10% to 20% lower for the cluster with the smaller battery.

16.6 Testing Multicluster Communication

Enter the installer password in order to be able to select the parameters "510.08 TstClstCom" and
"510.09 ClstComStt".
1. Using the parameter "510.08 TstClstCom" a communication test between the clusters can be
started from each master device of a cluster. Only switch the master device of the extension
cluster to "Transmit".
2. Request the status of the test via the Parameter "510.09 ClstComStt" at each master, including
the master at which the test was started.
☑ If the communication test is successful, the status "OK" appears on each master.

16.7 Automatic Frequency Synchronization

In multicluster operation, the automatic frequency synchronization can only be activated at the main
master. This function is activated using the parameter "250.11 AfraEna".

16.8 Firmware Update

Stopping the Sunny Island
It is recommended to stop the entire cluster network, and to deactivate the loads insofar as this
is possible.
DC Circuit Breaker
Do not activate the DC circuit breaker during update process.
Carry out the update on all masters of the individual
clusters via an SD memory card. All extension masters
must have completed their updates! The message shown
on the right is displayed.
After the update of the masters has been carried out, carry out an automatic update of the slaves.
Starting the multicluster system
Start the system only after the firmware on all Sunny Island devices has been updated.
148 SI4548-6048-US-BE-en-21
SMA Solar Technology America LLC
Operating Manual