5.6 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 two DC switches on
the SUN2000 are set to OFF. Failure to do so may result in electric shocks.
● When the SUN2000 operates in grid-tied mode, do not to 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 SUN2000 may be
damaged, or even a re could happen.
● The open-circuit voltage of each PV string must always be lower than or
equal to 1500 V DC.
● 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 SUN2000.
● 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 SUN2000 does not support full parallel connection for PV strings (full
parallel connection: PV strings connect to one another in parallel outside the
SUN2000 and then connect to the SUN2000 independently).
● 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 cable is
not properly installed or routed. In this case, an AC or DC short circuit may
occur and damage the SUN2000. The caused device damage is not covered
under any warranty.
Terminal Description
The SUN2000 provides 12 DC input terminals, which are controlled by its two DC
switches. DC SWITCH 1 controls DC input terminals 1–6 (MPPT1–3) and DC
SWITCH 2 controls DC input terminals 7–12 (MPPT4–6).
SUN2000-(90KTL, 95KTL, 100KTL, 105KTL) Series
User Manual
5 Electrical Connections
Issue 11 (2020-08-30) Copyright © Huawei Technologies Co., Ltd. 56
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