Ensure that the following conditions are met. Otherwise, the inverter may be
damaged, or even a re could happen.
● The DC input voltage of the SUN2000 cannot exceed the maximum input
voltage under any condition.
● The polarities of electric connections are correct on the DC input side. The
positive and negative terminals of a PV string connect to the corresponding
positive and negative DC input terminals of the SUN2000, respectively.
● If the polarity of the DC input power cables is reversed, do not operate the DC
switch as well as positive and negative connectors immediately. Wait until the
solar irradiance declines at night and the PV string current reduces to below 0.5
A, then turn
o the DC switch and remove the positive and negative
connectors, and rectify the connection of the DC input power cables.
● Since the output of the PV string connected to the SUN2000 cannot be
grounded, ensure that the PV module output is well insulated to ground.
● 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 caused device damage is not covered
under any warranty.
Figure 5-10 DC input terminals
Table 5-5 Selecting DC input terminals
Numbe
r of
Inputs
SUN2000 (Recommended Connection Method)
1 Connects to (2b+, 2b–)
2 Connects to (1b+, 1b–) and (2b+, 2b–)
SUN2000-4.95KTL-JPL1
User Manual 5 Electrical Connections
Issue 05 (2023-02-17) Copyright © Huawei Technologies Co., Ltd. 49
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