SMA SI 4548-US - Manual (Page 151)

SMA America, LLC 17 PV Inverters
Operating Manual SI4548-6048-US-BE-en-20 151
PV Inverters with BLUETOOTH
You can configure PV inverters with BLUETOOTH using the following communication products:
• Sunny Explorer
• Sunny WebBox mit BLUETOOTH Wireless Technology
17.4 Parameter Settings of the PV Inverters
17.4.1 Configuration of the 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. Therefore, the following requirements must be met:
• 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 must be equipped with an RS485
Piggy-Back.
• All PV inverters must be configured for battery-backup operation (see Section 17.3
"Configuration of the PV Inverters with a Communication Products", page 150).
When the utility grid is present at the AC2 terminal of the Sunny Island, the Sunny Boy will display the
message "Backupstate: Grid". When there is no utility grid present at the AC2 terminal of the
Sunny Island, the Sunny Boy will display the message "Backupstate: Off-Grid". The RS485
communication bus needs to be verified if this change does not occur.
Settings for Battery-Backup Operation via RS485 (e.g. with Sunny WebBox)
The following table shows how battery-backup operation must be set during configuration of the PV
inverters via RS485. The parameter name and the configurable value depend on the PV inverter being
used.
In battery-backup systems, you operate the PV inverters with the locally typical country data set for
grid-tie PV systems in accordance with UL1741. If the parameter is set to "On all" or "OnAllPhs", the
system meets the requirements as per UL1741.
Parameter name Value
Either "Backup Mode"
or
"Op.BckOpMod" Either "On all"
or
"OnAllPhs"
PV inverters without battery-backup function
For PV inverters without battery-backup function, 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 FSPC (frequency-shift power control) (see Section 17.5,
page 153). If there is an excessive supply of energy, the PV inverters will switch off.