Connecting the Stand-Alone Grid or Multicluster-Box 6 / 36
Qualified person
In off-grid systems you connect AC loads and the grid-parallel AC sources (e.g. PV inverters) using an AC sub-distribution board to the AC1 terminal of the Sunny Island. In the case of a multicluster system, the Multicluster-Box 6 or Multicluster-Box 36 is the AC distribution board that is connected to connection AC1 (for the connection of device type MC-BOX-12.3-20 Multicluster-Box 12 ( > Connection of Multicluster-Box 12 (MC-Box-12.3-20)).
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.
WARNING
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.
- On the Sunny Island, connect the cable to the AC1 Loads/SunnyBoys. To do this, connect the line conductor to AC1 Loads/SunnyBoys L and the neutral conductor to AC1 Loads/SunnyBoys N( > Connecting the AC Power Cable).
- Thread the grounding conductor through a ferrite included in the scope of delivery and connect to AC1 Loads/SunnyBoys PE ( > Connecting the Grounding Conductor).
- If the power cable conductor cross-section is less than 10 mm², thread an additional grounding conductor through the provided ferrite and connect it to the AC1 Loads/SunnyBoys PE terminal ( > Connecting the Grounding Conductor).