Multi-Core Cable Single-Core Cable
Unarmored Armored Unarmored Armored
R ≥ 15D R ≥ 12D R ≥ 20D R ≥ 15D
R indicates the bending radius, and D indicates the outer diameter of the cable.
The AC power cable must be routed vertically into the maintenance compartment.
5.7 Installing the DC Input Power Cable
Precautions
● Before connecting the DC input power cable, ensure that the DC voltage is
within the safe range (lower than 60 V DC) and that the three DC switches on
the inverter are set to OFF. Failure to do so may result in electric shocks.
● When the inverter operates in grid-tied mode, do not perform maintenance or
operations on the DC circuit, such as connecting or disconnecting a PV string or
a PV module in the PV string. Failure to do so may cause electric shocks or
arcing, which may also cause re.
Ensure that the following conditions are met. Otherwise, the inverter may be
damaged, or even a re could happen.
● The open-circuit voltage of each PV string must always be 1500 V DC or lower.
● The polarities of electric connections are correct on the DC input side. The
positive and negative terminals of a PV module connect to corresponding
positive and negative DC input terminals of the inverter.
During the installation of PV strings and the SUN2000, the positive or negative
terminals of PV strings may be short-circuited to ground if the power cables are
not properly installed or routed. In this case, an AC or DC short circuit may occur
and damage the SUN2000. The resulting device damage is not covered under any
warranty.
SUN2000-(175KTL-H0, 185KTL-INH0, 185KTL-H1)
User Manual 5 Electrical Connections
Issue 19 (2023-12-20) Copyright © Huawei Technologies Co., Ltd. 53
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