Requirements for the DC Connection
Connection options:
The inverter has two DC inputs, to each of which one string can be connected in normal operation.
You have the option of operating the DC inputs A and B in parallel, and therefore of connecting several strings to the inverter.
Connection overview for normal operation
Connection overview for parallel connection of the DC inputs A and B
Requirements for the PV modules per input:
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All PV modules should be of the same type.
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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.
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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).
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The positive connection cables of the PV modules must be equipped with positive DC connectors ( > Assembling the DC Connectors).
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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.
- 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 ( > Disconnecting the Inverter from Voltage Sources).