SMA SUNNY BOY 1.5 - DC Connection

6.4 DC Connection
6.4.1 Requirements for the DC Connection
Requirements for the PV modules of a string:
☐ All PV modules must be of the same type.
☐ All PV modules must be aligned identically.
☐ All PV modules must have the same tilt angle.
☐ The thresholds for the input voltage and the input current of the inverter must be adhered to
(see Section15 "Technical Data", page85).
☐ 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.
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10 "Disconnecting the Inverter from Voltage Sources", page59).
6.4.2 Assembling the DC Connectors
For connection to the inverter, all PV module connection cables must be fitted with the DC
connectors provided. Assemble the DC connectors as described in the following. Be sure to observe
the correct polarity. The DC connectors are marked with the symbols "+" and "−".
Figure 7: Negative (A) and positive (B) DC connectors
Cable requirements:
☐ Cable type: PV1-F, UL-ZKLA, USE2
☐ External diameter: 5mmto8mm
☐ Conductor cross-section: 2.5mm²to6mm²
☐ Qty single wires: minimum7
☐ Nominal voltage: minimum 1000V
☐ Using bootlace ferrules is not allowed.
6Electrical Connection
SMA Solar Technology AG
Operating ManualSB15-25-1VL-40-BE-en-1130