Connecting the PV Array

Qualified person

NOTICE

Damage to the product due to ground fault on DC side during operation

Due to the transformerless topology of the product, the occurrence of ground faults on DC side during operation can lead to irreparable damage. Damages to the product due to a faulty or damaged DC installation are not covered by warranty. The product is equipped with a protective device that checks whether a ground fault is present during the starting sequence. The product is not protected during operation.

  1. Ensure that the DC installation is carried out correctly and no ground fault occurs during operation.

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

  • 1 conduit (trade size: 27 mm (1 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: 27 mm (1 in) or smaller with suitable reducing bush)

  • If 3 or 4 strings are connected depending on the power class, additionally 1 conduit (trade size: 19.05 mm (0.75 in) or smaller with suitable reducing bush)

  • If 3 or 4 strings are connected, depending on the power class, an additional rain-tight conduit fitting or conduit fitting for wet locations, complying with UL 514B, is required (trade size: 19.05 mm (0.75 in) or smaller, with a suitable reducing bush).

Procedure:

  1. Disconnect the inverter from all voltage sources ( > Disconnecting the Inverter from Voltage Sources).
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  2. Remove the adhesive tape from the enclosure opening for connecting the PV modules to inputs A and B.
  3. If more than 2 strings are connected, remove the filler plug from the second enclosure opening from the left.
  4. Insert the conduit fitting into the opening and tighten from the inside using the counter nut.
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  5. Run the DC cables of the PV modules through the conduit into the inverter. Run the cables for PVA and PVB together through a conduit and the first enclosure opening into the inverter. If 3 or 4 strings are connected depending on the power class, run the cable for PVC and, if necessary, for PVD through a further conduit and the second enclosure opening into the inverter.
  6. Attach the conduit to the conduit fitting.
  7. Strip the DC cable insulation.
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  8. Connect the DC cables to the terminals according to the labels.
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  9. Connect the cable for grounding the PV modules to the busbar for grounding the DC connection (PZ2, minimum tightening torque 2.5 Nm). Verify that the stripped conductor does not protrude under the switch assembly. Otherwise, the inverter may report a ground fault.
  10. Tug lightly to ensure that the cables are secured in the terminals.
  11. If a weep hole has been added to the conduit, seal the conduit with sealing compound.

    Also see:

    Mounting the WLAN Antenna
    Connecting the power cable of the battery