5.7 Connecting DC Input Power Cables
Precautions
● Before connecting the DC input power cables, ensure that the DC voltage is
within the safe range (lower than 60 V DC) and that the three DC switches on
the solar inverter are set to OFF. Failing to do so may result in electric shocks.
● If you turn a DC SWITCH to ON by mistake when connecting or disconnecting
DC input power cables, do not remove or insert DC input terminals. If you need
to remove or insert a DC input terminal, perform the operations provided in 8.2
Power-O for Troubleshooting.
● When the solar 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. Failing to do so may
cause electric shocks or arcing, which may also cause re.
Ensure that the following conditions are met. Otherwise, the solar inverter may be
damaged, or even a
re could happen.
● The open-circuit voltage of each PV string must be 1100 V DC or lower under
any circumstances.
● 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 solar inverter.
● Ensure that the PV module output is well insulated to ground.
● The PV strings connecting to the same MPPT circuit should contain the same
number of identical PV modules.
● The solar inverter does not support full parallel connection for PV strings (full
parallel connection: PV strings connect to one another in parallel outside the
solar inverter and then connect to the solar inverter separately).
● During the installation of PV strings and the solar inverter, the positive or
negative terminals of PV strings may be short-circuited to ground if the power
cable is not properly installed or routed. In this case, an AC or DC short circuit
may occur and damage the solar inverter. The caused device damage is not
covered under any warranty.
SUN2000-(100KTL, 110KTL, 115KTL)-M2
User Manual 5 Electrical Connections
Issue 02 (2022-06-30) Copyright © Huawei Technologies Co., Ltd. 54
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