28 Installation and Operating Instructions V03
5.5 DC Connection
5.5.1 Requirements for the DC Connection
Requirements for the PV modules of a string:
• PV modules of the connected strings must be of: the same type, identical alignment
and identical tilt.
• The thresholds for the input voltage and the input current of the inverter must be
adhered to (see Section 10.1 "Technical DC input data").
• 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 connection cables of the PV modules must be equipped with the connectors
included in the scope of delivery.
• The positive connection cables of the PV modules must be equipped with the positive
DC connectors. The negative connection cables of the PV modules must be equipped
with the negative DC connectors.
Use of Y adapters for parallel connection of strings
The Y adapters must not be used to interrupt the DC circuit.
• Do not use the Y adapters in the immediate vicinity of the inverter.
The adapters must not be visible or freely accessible.
• In order to interrupt the DC circuit, always disconnect the inverter as
described in this document (see Section 9 "Disconnecting the Inverter
from Voltage Sources").
Danger to life due to high voltages in the inverter
• Before connecting the PV array, ensure that the DC switch is switched
off and that it cannot be reactivated.
• Do not disconnect the DC connectors under load.
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