SMA SUNNY ISLAND 4548-US Operating Manual page 49

SMA Solar Technology America LLC
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 system.
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 191).
Connecting the AC1 cable:
Wire size
The maximum wire size for connecting the loads/PV inverters is 4 AWG (25 mm²).
1. Install a conduit with a diameter of
Sunny Island enclosure. Attach the conduit on the inside of the Sunny Island with a counter nut.
2. Install the conduit on the distribution board.
3. Pull the cable from the distribution board through the conduit into the Sunny Island.
4. Remove the protective insulation of the three cables (insulation stripping length: 0.75 in
(18 mm)).
Operating Manual
3
/ in. (19 mm) at the left opening on the left side of the
4
6 Electrical Connection
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