2 security, 1 intended use, Security – SMA SC 500HE-20 Installation User Manual
Page 9: Intended use
SMA Solar Technology AG
2 Security
Installation Manual
SCxxxHE-20-IA-IEN111210
9
2 Security
2.1 Intended Use
The Sunny Central is a central inverter which converts the direct current from PV modules into
alternating current. Here, the maximum permissible DC input voltage must not be exceeded.
The Sunny Central is suitable for indoor installation, providing that the specified safety distances are
complied with. The enclosure complies with the IP21 protection class. IP21 means that the closed
inverter is protected against vertically falling dripping water. The inverter is classified under
Class 3 C1L according to EN 60721-3-3.
Inverters of the HE series may only be operated in connection with a suitable transformer.
The transformer must be designed for the voltages that arise during pulsed operation of the inverter.
The voltages can reach a magnitude of maximum ±1 450 V to ground. (see Technical Information
"Medium-voltage Transformer" at www.SMA.de/en).
Do not switch off or change settings that affect grid management without first obtaining approval from
the distribution grid operator.
Figure 1: Principle of a grid-tie PV plant with an inverter
Position
Description
A
PV modules
B
Sunny String-Monitor
C
Sunny Central
D
Medium-voltage Transformers
E
Power distribution grid
A
B
C
D
E
SMA
SMA
HE