8 Configuration
SMA Solar Technology AG
Operating manual
STP15-25TL-30-BE-en-17
47
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.
Procedure:
• Activate the Modbus interface and adjust the communication ports if necessary (see the
technical information "SMA Modbus® Interface" or "SunSpec® Modbus® Interface" at
www.SMA-Solar.com).
8.5
Configuring Q on Demand 24/7
With the "Q on Demand 24/7" function, the inverter remains connected to the utility grid overnight
and is supplied with power via the utility grid in order that it can provide reactive power. When
connected overnight, the inverter only draws an insignificant amount of active power from the utility
grid to supply its internal assemblies. The inverter can provide up to 100% of its power as reactive
power. The provision of reactive power during feed-in operation leads to a reduction of the feed-in
power. This means that at 100% reactive power, the feed-in power is 0%.
The general setting of the grid management services (e.g. cos phi setpoint or Q(V) characteristic
curve) can not be fully set independently of the "Q on Demand 24/7" function via the relevant
parameters - "Q on Demand 24/7" only permits Q specifications. It is to be noted here that certain
settings can have an influence on other grid-support settings and functions.
This means that if the "Q on Demand 24/7" function" is active, no other grid-supporting functions
(e.g., cos phi) are possible between day and night operation of the inverter. Should an
independent reactive power provision be desired between day- and night operation, the reactive
power provision must be communicated to the inverter via a superordinate control unit.
Currently, the provision of reactive power can only be read off via the phase currents and phase
voltages in the instantaneous values (
Instantaneous values > AC Side > Phase currents /
Phase voltage
) or requested via Modbus.
Procedure:
1. Start Sunny Explorer.
2. Log in as
Installer
.
3. Select
Options > SMA Grid Guard ...
.
4. Enter the SMA Grid Guard code.
5. Select the relevant device in the System tree.
6. Select the tab
Settings
in the device menu.
Summary of Contents for 15000TL
Page 95: ......
Page 96: ...www SMA Solar com...
