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 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 fitted with the positive DC connectors (for information on assembling DC connectors, see the DC connector installation manual).
  • The negative connection cables of the PV modules must be fitted with the negative DC connectors (for information on assembling DC connectors, see the DC connector installation manual).

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).
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    >  Connecting the PV Array