SMA SUNNY ISLAND 4.4M Operating Manual page 39

SMA Solar Technology AG
Requirements for connecting Sunny Island inverters in single-phase parallel single-cluster systems:
☐ For a single-phase parallel single-cluster system, the cable length and conductor cross-section from each
Sunny Island to the AC distribution board must be identical. This will allow for stable and symmetric operation.
Danger to life due to fire
In case of a short circuit, the short-circuit current driven by the generator flows over the unprotected cable between
the Sunny Island and the AC distribution board. Short-circuit currents can cause fires.
• If the fuse on the generator has a higher operating current than the fuse in the AC distribution board, size the
cable between the generator and AC distribution board in accordance with the operating current of the fuse on
the generator.
1. On the Sunny Island, connect the cable to the AC1 Loads/
SunnyBoys terminal (see Section 6.6.2 "Connecting the AC
Power Cable", page 62).
• Connect the line conductor to AC1 Loads/SunnyBoys L.
• Connect the neutral conductor to AC1 Loads/SunnyBoys N.
2. In addition, thread the grounding conductor through a ferrite included in the scope of delivery and connect to
AC1 Loads/SunnyBoys PE (see Section 6.6.3 "Connecting the Grounding Conductor", page 63).
3. If the power cable conductor cross-section is less than 10 mm², thread an additional grounding conductor through
the same ferrite and connect it to the AC1 Loads/SunnyBoys PE terminal. (see Section 6.6.3 "Connecting the
Grounding Conductor", page 63).
Operating Manual
6 Electrical Connection
SI44M-80H-12-BE-en-10 39