Grid; Conditions; Starting The Sunny Island 5048; Stand-Alone Grid Operation - SMA Sunny Island 5048 Installation Instructions Manual

Connecting External Sources

14.2 Grid

The Sunny Island 5048 supports the operation of grid backup systems on the grid.
Here, a distinction is made between two main states: either a main power grid and
stand-alone grid are connected or a main power grid and stand-alone grid are
disconnected. The operating mode of the inverter is derived from this. If the stand-alone
grid is disconnected, the inverter is solely responsible for powering this stand-alone
grid. If the grid is connected to the stand-alone grid, the stand-alone grid is powered
from the main power grid. The voltage and frequency in the stand-alone grid and in the
main power grid are identical.
Under specific conditions, the system can also temporarily feed energy from the
stand-alone grid into the main power grid in the GridCharge operating mode
("#250.08 GdMod" parameter).

14.2.1 Conditions

In order to operate on the grid, very strict limits (for voltage and frequency) must
generally be maintained. This strict limits are not sensible for generator operation. The
limits are therefore set separately for grid operation and the generator limits are not
used.
The default settings for limits during grid operation comply with the following
standards:
• For 230V_50Hz: DIN VDE 0126-1-1 (not entirely)
• For 220V_60Hz: UL1741
The Sunny Island 5048 does not meet the VDE 0126-1-1 directive required
in Germany and, for legal reasons, it must therefore be MSD-certified (e.g.
by UfE GmbH) when operated while connected to the public grid.

14.2.2 Starting the Sunny Island 5048

The Sunny Island 5048 always starts in stand-alone grid operation. Once the device
is operating, it checks for the presence and availability (voltage and frequency) of the
external grid.

14.2.3 Stand-Alone Grid Operation

The main power grid and stand-alone grid are disconnected and the inverter powers
the stand-alone grid. The system waiting for the grid to reconnect is an indication of this
state.
Page 110 SI5048-11:EE4206
SMA
Technologie AG
Technical Description