17 PV Inverters
SMA America, LLC
150
SI4548_6048-US-TB_en-13
Technical description
17 PV Inverters
The following section provides information on the connection and configuration of the Sunny Boy
inverter in stand-alone grid systems.
The Sunny Island together with the Sunny Boy inverter are optimized for back-up operation (grid-tied)
and for "Off-Grid" use.
This section describes the parameter setting of the Sunny Boy for both kinds of application. In backup
operation, the "Default" parameter has to be set to "UL 1741". In grid parallel operation the
Sunny Island automatically detects a power outage and automatically switches the Sunny Boy inverter
to "Off-Grid" mode. To set up this arrangement, the Sunny Island and the Sunny Boy have to be
connected with a data cable and the parameter of the Sunny Boy inverters has to be set according
to this documentation. In case the grid returns, the Sunny Island switches back to grid-tie mode
according to "UL 1741".
17.1 Connection to the Stand-Alone Grid (Protected Load Switch)
• Connect the Sunny Boy to the grid in accordance with the Sunny Boy installation manual.
• Connect the AC sub-distribution to the AC1 terminals of the Sunny Island. This sub-distribution is
where the PV inverter will be connected as well.
• You must set the corresponding parameters in the Sunny Boy to suit a stand-alone grid so that
it works properly together with the Sunny Island. The required values for these settings are
described in the next section.
Interface for external communication in Sunny Island systems with the utility grid
If the utility grid is connected to the Sunny Island system as an external source, the RS485
communication between the Sunny Island and the PV inverters is necessary. For this, the
following devices each need one RS485 interface:
• the Sunny Island (if there are several Sunny Island inverters, the Sunny Island master)
• each PV inverter
Danger to life due to high voltages in the Sunny Island. Risk of death or serious injury due to electric
shock.
• Ensure that the entire connection area of the Sunny Island 4548-US/6048-US is voltage-free
before installing the Sunny Boy inverter.
• Observe the safety precautions (see Section 3 "Safety Precautions", page 26).
Summary of Contents for Sunny Island 4548-US
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