8 Operation
SMA Solar Technology AG
Operating manual
SBS25-1VL-10-BE-en-13
65
8. In the field
Fallback value of the maximum active power
enter the value to which the
inverter is to limit its nominal power in case of a communication failure to the higher control
unit at the end of the timeout time.
9. In the field
Timeout
, enter the time that the inverter is to wait before it limits its nominal power
to the set fallback value.
10. If, in the event of a 0% or 0 W specification, the inverter is not permitted to feed small amounts
of active power into the utility grid, select the entry
Yes
in the drop-down list
Grid
disconnection for 0% active power setpoint
. This ensures that in the event of a 0% or 0 W
specification, the inverter disconnects from the utility grid and does not feed in active power.
8.11 Configuring the Modbus Function
The Modbus interface is deactivated by default and the communication ports 502 set.
In order to access SMA invertes with SMA Modbus
®
or SunSpec
®
Modbus
®
, the Modbus interface
must be activated. After activating the interface, the communication ports of both IP protocols can
be changed. For information on commissioning and configuration of the Modbus interface, see the
technical information "SMA and SunSpec Modbus® Interface" at www.SMA-Solar.com.
For information on which Modbus registers are supported, see the technical information "Modbus®
parameters and measured values" at www.SMA-Solar.com.
Data security during enabled Modbus interface
If you enable the Modbus interface, there is a risk that unauthorized users may access and
manipulate the data or devices in your PV system.
To ensure data security, take appropriate protective measures such as:
• Set up a firewall.
• Close unnecessary network ports.
• Only enable remote access via VPN tunnel.
• Do not set up port forwarding at the communication port in use.
• In order to disable the Modbus interface, reset the inverter to the default settings or
disable the parameter again.
Deactivate the dynamic active power limitation for the PV inverters when
controlled via Modbus
If the PV inverters and the battery inverter are controlled in a PV system via Modbus, the
dynamic active power limitation of the PV inverters must be deactivated.
Procedure:
• Activate the Modbus interface and adjust the communication ports if necessary (see the
technical information "SMA and SunSpec Modbus® Interface" at www.SMA-Solar.com).
Summary of Contents for SUNNY BOY STORAGE 2.5
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