6 Electrical Connection
SMA America, LLC
46
SI4548_6048-US-TB_en-13
Technical description
6.3.2 AC1 (Loads/Sunny Boys)
The sub-distribution of the stand-alone grid (e.g. loads, PV inverter, wind power inverter) is to be
connected to output AC1 of the Sunny Island.
If you want to fuse individual load circuits in a 120 V grid separately, install circuit breakers with a
rated current of up to 20 A: the Sunny Island can safely trigger circuit breakers of up to 20 A.
If you install circuit breakers with a higher rated current, the Sunny Island may not trigger these. In this
case the DC breaker in the Sunny Island would trigger and the Sunny Island would disconnect itself
(see Section 9.5 "Reactivating the Device Following Automatic Shutdown", page 75).
Cable lengths in single-phase, parallel, split-phase, double split-phase and
three-phase systems
The AC lines between the Sunny Island and the sub-distribution of a system must have the same
cable cross-section and the same length for all parallel connected devices.
Distributing loads and AC feed-in generators in multiple-phase systems
Distribute the feed-in power and the consumed power of the loads and AC feed-in generators
as equally as possible across all line conductors of the plant.
Connection in a split-phase system
In a split-phase system, connect the master to line conductor L1 and the slave 1 to line
conductor L2 (see Section 2.2 "At a Glance", page 22).
Double split-phase system
In a double split-phase system, connect the master and slave 2 to line conductor L1.
In a double split-phase system, connect slave 1 and slave 3 to line conductor L2.
Connection in a three-phase system
Always install the master on line conductor L1, slave 1 on L2 and slave 2 on L3. This installation
has a right-hand rotating magnetic field.
Failure of a line conductor within a three-phase system
If in a three-phase system a line conductor fails on the master, the cluster stops. If a line
conductor fails on a slave, the cluster can either continue to operate or switch off. Whether the
cluster continues to work or switches off depends on the setting of the parameter
"250.30 RnMod" (see Section 19.2.5 "System Settings (250#)", page 190).
Summary of Contents for Sunny Island 4548-US
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