Dc Input Terminals - Huawei SUN2000-15KTL-50KTL-M3 Series User Manual

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual

PV modules connected in series in each PV string are of the same specifications.

The DC input voltage of the SUN2000 shall not exceed 1100 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 the corresponding positive and negative DC
input terminals of the SUN2000, respectively.

If the DC input power cables are reversely connected, 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, 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 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.

In the spare part replacement scenario, the DC input power cables can be connected only
to PV1–PV6. If the DC input power cables are connected to PV7 or PV8, the inverter data
cannot be transmitted to the northbound device.
Figure 6-45 DC input terminals
When the DC input is not fully configured, the DC input terminals must meet the following
requirements:
1.
2.
Number
of PV
Strings
1
3
5
Issue 01 (2021-04-05)
Evenly distribute the DC input power cables on the four MPPTs and preferentially
connect them from MPPT 1 to MPPT 4.
Maximize the number of connected MPPTs.
Terminal Selection
Connects to any route.
PV1, PV3, PV7
PV1, PV2, PV3, PV5, PV7
Copyright © Huawei Technologies Co., Ltd.
6 Electrical Connections
Number Terminal Selection
of PV
Strings
2 PV1, PV7
4 PV1, PV3, PV5, PV7
6 PV1, PV2, PV3, PV5, PV7,
PV8
77