Device Faults And Autostart; Automatic Frequency Synchronization; Time-Controlled Standby - SMA SUNNY ISLAND 4548-US Operating Manual

12 Additional Functions
Double-Split-Phase System
In a double split-phase system, each line conductor must only be fitted with Sunny Island inverters of
the same type (e.g. two Sunny Island 6048-US).

12.6 Device Faults and Autostart

If a critical fault occurs, the Sunny Island automatically shuts down and displays the reason on the
display. If the autostart function is activated (parameter "250.01 AutoStr") the Sunny Island can
acknowledge the error automatically and restart on its own. If the error persists, the Sunny Island
cannot be started.
Autostart meter
If the autostart meter has counted down to zero, the Sunny Island waits for ten minutes before
attempting to restart automatically.
Displaying messages
Messages can be displayed at any time while the device is in operation and they have priority
over the "Home Screen" display.

12.7 Automatic Frequency Synchronization

Clocks that depend on the stability of the power frequency for their accuracy become increasingly
inaccurate when there are constant frequency deviations. Frequency fluctuations, i.e., deviations from
the nominal frequency occur, for example, in off-grid systems that operate with a diesel generator.
The automatic frequency synchronization (German: AFRA) function of the Sunny Island allows the use
of clocks in these types of off-grid systems. This function is activated using the parameter
"250.11 AfraEna". The time deviation is compensated on average.
Quartz-controlled clock in the Sunny Island
The internal clock in the Sunny Island is quartz-controlled and thus operates correctly (within the
tolerance limits). The adjustment refers to externally connected clocks that depend on the power
frequency.

12.8 Time-Controlled Standby

You can set the Sunny Island to standby mode in a time-controlled way. Activate the time-controlled
standby using the parameter "250.13 SlpAtNgt". Set the parameter to "Enable".
After activation, set the start time and the stop time for standby. Carry out the setting using the
parameters "250.14 SlpStrTm" and "250.15 SlpStpTm".
106 SI4548-6048-US-BE-en-21
SMA Solar Technology America LLC
Operating Manual