LED
Status
Explanation
Green LED
glowing
Feed-in operation
If an event occurs during feed-in operation, an event mes-
sage will be shown in the communication product (for
event messages see the service manual at www.SMA-So-
lar.com).
flashing
The conditions for feed-in operation are not yet met. As
soon as the conditions are met, the inverter will start feed-
in operation.
Red LED
glowing
Error
An error has occurred. The error must be rectified by a
qualified person (for troubleshooting, see the service man-
ual at www.SMA-Solar.com).
Blue LED
-
No function
4.3
Interfaces and Functions
The inverter can be equipped or retrofitted with the following interfaces and functions:
SMA Speedwire/Webconnect
The inverter is equipped with SMA Speedwire/Webconnect as standard. SMA Speedwire/
Webconnect is a type of communication based on the Ethernet standard. This enables inverter-
optimized 10/100 Mbit data transmission between Speedwire devices in PV systems and the
software Sunny Explorer. The Webconnect function enables direct data transmission between the
inverters of a small-scale system and the Internet portal Sunny Portal without any additional
communication device and for a maximum of four inverters per Sunny Portal system. In large-scale
PV power plants, data transmission to the Internet portal Sunny Portal is carried out via the
SMA Cluster Controller. You can access your Sunny Portal system from any computer with an
Internet connection.
SMA Speedwire/Webconnect enables, for PV systems operated in Italy, the connection to or
disconnection of the inverter from the utility grid and definition of the frequency limits to be used
with IEC61850-GOOSE messages.
RS485 interface
The inverter can communicate via cables with special SMA communication products via the RS485
interface (information on supported SMA products at www.SMA-Solar.com). The RS485 interface
can be retrofitted.
Grid Management Services
The inverter is equipped with service functions for grid management.
Depending on the requirements of the grid operator, you can activate and configure the functions
(e.g. active power limitation) via operating parameters.
4 Product Description
SMA Solar Technology AG
Operating Manual
STP20-25TL-BE-en-11
14