Connecting the Utility Grid

Qualified person

If the inverter is connected together with a product for backup operation (e.g. SMA Backup Start), the cables for backup operation should be connected together with the utility grid ( > Connect the utility grid along with power and signal cables for backup operation).

Requirements:

  • The cables for connection to the utility grid must be preassembled.

Additionally required material (not included in the scope of delivery):

  • 1 conduit (trade size: 19.05 mm (0.75 in) or smaller with suitable reducer bush)

  • Sealing compound for sealing the join between the conduit and inverter if a weep hole has been added to the conduit

  • 1 rain-tight conduit fitting or conduit fitting for wet locations complying with UL 514B (trade size: 19.05 mm (0.75 in) or smaller with suitable reducing bush)

Procedure:

  1. Disconnect the inverter from all voltage sources ( > Disconnecting the Inverter from Voltage Sources).
  2. Remove the filler plug from the first enclosure opening from the right.
  3. If necessary, enlarge the 1st enclosure opening from the right to use a 27 mm (1 in) cable conduit. Utilize a hole punch to do this. Ensure that no shavings remain in the enclosure after expansion.
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  4. Insert the conduit fitting in the first enclosure opening from the right and tighten with the counter nut from the inside.
  5. Run the AC conductors simultaneously through the conduit into the inverter and attach the conduit to the conduit fitting.
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  6. Run L1, L2 and N for the AC connection through the ferrite.
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  7. Secure the ferrite with a cable tie.
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  8. Connect the grounding conductor for the AC connection to the busbar according to the label, as short as possible without the conductor being under tension. To do so, insert the conductor into the busbar against the stop and tighten the screw (PZ2, minimum torque 2.5 Nm).
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  9. Attach L1, L2, and N of the AC connection to the AC terminals according to the labels. To do so, stick a flathead screwdriver (4 mm (0.16 in)) into the top opening of the terminal and insert the cable into the lower opening against the stop. Then remove the screwdriver.
  10. Tug lightly to ensure that all conductors are secured in the terminals.
  11. If a weep hole has been added to the conduit, seal the conduit with sealing compound.

    Also see:

    Electrical connection procedure
    Connect the utility grid along with power and signal cables for backup operation