SMA STP 25000TL-30 - DC Connection

6 Electrical Connection
SMA Solar Technology AG
Operating manualSTP15-25TL-30-BE-en-1730
2. Lead the clamping bracket over the grounding
cable. Arrange the grounding cable on the left-hand
side.
3. Screw the clamping bracket tight using the M6x16
cylindrical screw and the conical spring washer M6
(torque: 6Nm). The teeth of the conical spring
washer must face the clamping bracket.
6.3 DC Connection
6.3.1 Requirements for the DC Connection
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 maximum input current per string must be maintained and must not exceed the through-
fault current of the DC connectors (see Section14 "Technical Data", page85).
☐ The thresholds for the input voltage and the input current of the inverter must be adhered to
(see Section14 "Technical Data", page85).
☐ 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.
• 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11, page76).