SMA SC 200 Installation - Manual (Page 58)

External Connections SMA Solar Technology AG
58 SC20_25_35-IEN094521 Installation Guide
6.4 Connecting the Internal AC Power Supply
The power required to operate the Sunny Central 200, Sunny Central 250 and Sunny Central 350
is either supplied via an external power supply or tapped internally. If the power is tapped internally,
the energy yield decreases by the system's own power requirements (fan, heater) of the Sunny
Central.
In the Sunny Central 250HE, an internal supply transformer can be connected in addition to the
external power supply. For detailed information on connecting the internal supply transformer, see the
Technical Information "Sunny Central - Important Information on Internal Supply Transformers). The
standard grid connection structure for the internal power supply is a TN-S grid.
The Sunny Central 200 requires a single phase internal supply, the Sunny Central 250,
Sunny Central 250HE and Sunny Central 350 require a three-phase internal supply.
The following diagram shows the connection terminals for the internal AC power supply in the
Sunny Central 250.
Circuit breaker for Internal Supply
Protect the grid connection line with a circuit breaker. See the Technical Data (see
section 8 ”Technical Data” (page 81)) for notes on dimensioning the line circuit breaker.