Huawei SUN2000-M3 User Manual page 54

SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual
Ensure that the following conditions are met. Otherwise, the SUN2000 may be
damaged, or even a fire could happen.
● PV modules connected in series in each PV string are of the same specifications.
● The DC input voltage of the SUN2000-29.9KTL/30KTL/36KTL/40KTL-M3 shall
not exceed 1100 V DC under any circumstance.
● The DC input voltage of the SUN2000-20KTL-M3 shall not exceed 800 V DC
under any circumstance.
● The polarities of electric connections are correct on the DC input side. The
positive and negative terminals of a PV string connect to corresponding positive
and negative DC input terminals of the SUN2000.
● If polarity of the DC input power cable is reversed and the DC switch is ON, do
not turn off the DC switch immediately or remove positive and negative
connectors. Wait until the solar irradiance declines at night and the PV string
current reduces to below 0.5 A, and then turn off the DC switch and remove
the positive and negative connectors. Correct the PV string polarity before
reconnecting the PV string to the SUN2000.
● The SUN2000 does not support power supplies other than PV strings. 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 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.
Figure 5-12 DC input terminals
When the DC input is not fully configured, the DC input terminals must meet the
following requirements:
1.
2.
Issue 11 (2023-01-10)
WARNING
NO TICE
Distribute the DC input power cables evenly over four MPPT circuits, and
connect them preferentially through MPPT1 and MPPT4.
Maximize the number of connected MPPT circuits.
Copyright © Huawei Technologies Co., Ltd.
5 Electrical Connections
45