30 SB3-5TL-21-BE-en-10 Operating Manual
6 Electrical Connection SMA Solar Technology AG
6.4 DC Connection
6.4.1 Requirements for the DC Connection
Funkt.Titel_ Anforderungen an di e PV-Module pr o Eingang
Requirements for the PV modules per input:
☐ All PV modules must be of the same type.
☐ The same number of series-connected PV modules must be connected to all strings.
☐ All PV modules must be aligned identically.
☐ All PV modules must have the same tilt angle.
☐ The maximum input current per string must be maintained and must not exceed the through-fault
current of the DC connectors (see Section 13 "Technical Data", page 53).
☐ The limiting values for the input voltage and the input current of the inverter must be adhered to
(see Section 13 "Technical Data", page 53).
☐ 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 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).
Mixed connection
Use of Y adapters for parallel connection of strings
The Y adapters must not be used to interrupt the DC electric 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 electric circuit, always disconnect the inverter as described in
this document (see Section 10, page 47).
In case of incorrect connection of the DC cables, the requirements of the EMC
directive are no longer met.
If the positive pole and the negative pole of a string are not connected to the same input,
the inverter no longer meets the requirements of the EMC directive.
• Always connect the positive pole and the negative pole of one string to the same input.
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