Requirements for the DC Connection


Connection options:

The inverter has two DC inputs. In normal operation, two strings can be connected to DC input A and one string to DC input B.

You have the option of operating the DC inputs A and B in parallel, and therefore of connecting several strings to the inverter.

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Connection overview for normal operation

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Connection overview for parallel connection of the DC inputs A and B

Requirements for the PV modules per input:

  • All PV modules should be of the same type.

  • All PV modules should 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 maximum input current per string must be maintained and must not exceed the through-fault current of the DC connectors Technical Data).

  • The thresholds for the input voltage and the input current of the inverter must be adhered to Technical Data).

  • The positive connection cables of the PV modules must be equipped with positive DC connectors Assembling the DC Connectors).

  • The negative connection cables of the PV modules must be equipped with the negative DC connectors Assembling the DC Connectors).

Use of Y adapters for parallel connection of strings

The Y adapters must not be used to interrupt the DC circuit.

  1. Do not use the Y adapters in the immediate vicinity of the inverter. The adapters must not be visible or freely accessible.
  2. In order to interrupt the DC circuit, always disconnect the inverter as described in this document Disconnecting the Inverter from Voltage Sources).