Requirements for the DC Connection
Connection options:
The inverter has 2 DC inputs. In case of STP5.0-3SE-40 / STP6.0-3SE-40 / STP8.0-3SE-40, 1 string can be connected to DC input A and 1 string can be connected to DC input B. In case of STP10.0-3SE-40, 1 string can be connected to DC input A and 2 strings to DC input B.
Connection overview with STP5.0-3SE-40 / STP6.0-3SE-40 / STP8.0-3SE-40
Connection overview with STP10.0-3SE-40
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 short-circuit current of a string must not exceed the maximum short-circuit current of the inverter ( > Technical Data).
The thresholds for the input voltage of the inverter must be adhered to ( > Technical Data).
The maximum usable input power may be exceeded ( > Technical Data). The power exceeding the specified value cannot be used.
-
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.
- 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).