Electrical Connection
SMA America, LLC
48
SI5048U-TUS121440
Technical Description
5. Insert PE into the terminal labeled "AC1 Loads/Sunny Boys" and tighten the fastening screw with
a torque of 22 in-lbs. − 39 in-lbs. (2.5 Nm − 4.5 Nm). Use a torque wrench with flat-head
screwdriver bit SZS 1.0 x 6.5.
6. Insert N and L into the terminals labeled "AC1 Loads/Sunny Boys" and tighten the fastening
screws with a torque of 22 in-lbs. − 39 in-lbs. (2.5 Nm − 4.5 Nm). Use a torque wrench with
flat-head 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 power distribution grid is to be connected at input AC2 of the
Sunny Island.
Cable lengths in 1‑phase, parallel, split‑phase‑, double split‑phase‑ and 3‑phase
systems
The AC cables between all Sunny Island and the generator/grid in a system must have the
same size and length.
1‑phase parallel system
In the case of 1‑phase parallel systems, also connect the generator or the grid to all slaves
on AC2. The cable cross‑sections and cable lengths used must be identical.
Distribution of Loads and AC Feed‑In Generators in Multi‑Phase Systems
Distribute the feed‑in capacity and consumption power of the loads as well as the AC
feed‑in generators as equally as possible across all system phases.
Split‑Phase System
In a split‑phase system, connect the master to phase L1 and the slave 1 to phase L2
(see also 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 phase L1.
In a double split‑phase system, connect the slave 1 and the slave 3 to phase L2.
3‑phase system
Always install the master on phase L1, slave 1 on L2 and slave 2 on L3. This installation
has a right‑hand rotary field.
