SMA SI 4548-US - Manual (Page 50)

6 Electrical Connection SMA America, LLC
50 SI4548-6048-US-BE-en-20 Operating Manual
6. Insert N and L into the terminals labeled "AC1 Loads/Sunny Boys" and tighten the fastening
screws with a torque of 22 in-lb (2.5 Nm). Use a torque wrench with flat-blade screwdriver bit
SZS 1.0 x 6.5.
☑ The AC1 cables are connected.
6.3.3 AC2 (Generator/Grid)
The sub-distribution of the generator or utility grid is connected at input AC2 of the Sunny Island.
Cable lengths in single-phase, parallel, split-phase, double split-phase and
three-phase systems
The AC cables between all Sunny Island inverters and generator or the utility grid of a system
must have the same wire size and the same cable length.
Single-phase parallel system
In the case of single-phase parallel systems, also connect the generator or the utility grid to all
slaves on AC2. The wire sizes and cable lengths used must be identical.
Distribution of loads and AC feed-in generators in multi-phase systems
Distribute the feed-in power and consumption power of the loads as well as the AC feed-in
generators as equally as possible across all line conductors of the system.
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 21).
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.
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.