SMA Sunny Boy Series - 3 Configuration of PV Inverters in Battery-Backup Systems

3 Configuration of PV Inverters in Battery-Backup Systems SMA Solar Technology America LLC
4 SB-OffGrid-TI-US-en-19 Technical Information
Setting the Country Data set via Speedwire
The following table shows how the country data set must be set during configuration of the PV inverters via Speedwire.
The country data set value depends on the PV inverter being used.
3 Configuration of PV Inverters in Battery-Backup Systems
In a battery-backup system, the Sunny Island is connected to the utility grid and communicates with the PV inverters via
RS485. This is why the Sunny Island and each PV inverter must be equipped with an RS485 Piggy-Back or an RS485
data module. In a cluster, only the master of the Sunny Island inverters may be equipped with an RS485 Piggy-Back. In
a battery-backup system, all PV inverters must be configured for backup operation (see Section4 "Communication
Products for Configuring PV Inverters", page5).
Setting Backup Operation via RS485
The following table shows how backup operation must be set during configuration of the PV inverter via RS485.
The parameter name and the configurable value depend on the PV inverter and the communication product in use.
In battery-backup systems you operate the PV inverters with the locally typical country data set for grid-connected PV
systems as per UL1741. If the parameter is set to On all or OnAllPhs, the system meets the requirements as per UL1741.
Parameter name Value
Set country standard Either Island mode
or
depending on power frequency, Island mode 50 for 50 Hz power frequency or
Island mode 60 for 60 Hz power frequency
Parameter name Value
Backup Mode
or
Op.BckOpMod
On all
or
OnAllPhs
PV inverters without backup operation
For PV inverters without backup operation, the country data set must be set to the locally typical value for grid-tie
PV systems as per UL1741. The PV inverter is then configured for operation on the utility grid. In the event of a utility
grid failure, the Sunny Island is unable to derate the PV inverters by means of Frequency-Shift Power Control (FSPC).
If there is an excessive supply of energy, the PV inverters will switch off.