SMA SC 250U - Manual (Page 42)

Appendix - Glossary SMA America, LLC
42 SCUS-BE-BUS120514 User Manual
RS485
RS485 is an interface standard for cable-bound data transmission. RS485 allows communication with
50 inverters and communication devices over a distance of 4,000 ft.
String
Describes a group of PV modules connected in series.
Sunny Central
The Sunny Central is an inverter for large PV power systems. This inverter concept is one in which all
PV modules are connected to each other (in series and/or parallel) and a single inverter is used for
feeding energy into the grid.
Sunny Portal
Sunny Portal is a web-based service provided by SMA which offers the possibility of creating a
personal Sunny Portal website on which the data pertaining to a photovoltaic plant can be displayed.
Additionally, the Sunny Portal archives this data. The PV power system data is available worldwide
over the Internet.
Sunny SensorBox
The Sunny SensorBox and the sensors enable you to acquire environmental data of your PV power
system which are relevant for performance evaluation. For this purpose, the Sunny SensorBox is
equipped as standard with an integrated irradiation sensor and an external module temperature
sensor. The Sunny SensorBox delivers the sensor data via an RS485 interface to the SMA
communication devices (e.g. Sunny WebBox).
Sunny Central String-Monitor
The DC cables from the PV generators are collected in the Sunny Central String-Monitor. The Sunny
Central String-Monitor monitors the current of the PV modules and can detect failures, e.g., the failure
of a module.
Sunny WebBox
The Sunny WebBox collects the data from the Sunny Central continuously. To read the data, the
Sunny WebBox can be connected to a laptop or PC. The data can be processed with Sunny Portal,
for example.
Switch
A switch is a network component which allows the connection of several computers or network
segments in a local network.
THD
Abbreviation for Total Harmonic Distortion