Requirements for the DC Connection

Requirements for the PV modules per input:

  • All PV modules must be of the same type.
  • All PV modules must be aligned and tilted identically.
  • On the coldest day based on statistical records, the open-circuit voltage of the PV array must never exceed the maximum input voltage of the inverter.
  • The same number of series-connected PV modules must be connected to each string.
  • The thresholds for the input voltage and the input current of the inverter must be adhered to ( > Technical Data).
  • The maximum input current per string must be maintained ( > Technical Data).

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

  • Depending on the number of strings, one or two conduits made of metal: 25.4 mm (1 in)
  • Depending on the number of conduits, one or two rain-tight conduit fittings for wet locations complying with UL 25.4 mm (1 in)
  • For closing unused enclosure openings for the DC connection: UL-listed type 3R filler plugs

Cable requirements:

  • The DC cables must be approved for temperatures of over +90°C (+194°F).
  • The maximum cable length subject to conductor cross-section must be observed.
  • Conductor type: copper wire
  • Only use solid wire or stranded wires.
  • Conductor cross-section: 10 mm² to 35 mm² (8 AWG to 2 AWG)
  • The DC cables must be sized in accordance with the installation requirements applicable on site.
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