Huawei SUN2000-50KTL-NHM3 User manual

HUAWEI TECHNOLOGIES CO., LTD.
SUN2000-50KTL-NHM3
Quick Guide
Issue: 02
Part Number: 31500HQX
Date: 2023-01-10

1
1Overview
Copyright © Huawei Technologies Co., Ltd. 2023. All
rights reserved.
•The information in this document is subject to change without notice. Every effort has been
made in the preparation of this document to ensure accuracy of the contents, but all
statements, information, and recommendations in this document do not constitute a
warranty of any kind, express or implied.
•Only qualified and trained electrical technicians are allowed to operate the device. Operation
personnel should understand the composition and working principles of the grid-tied PV
power system and local regulations.
•Before installing the device, read the user manual carefully to get familiar with product
information and safety precautions. Huawei shall not be liable for any consequences caused
by the violation of the storage, transportation, installation, and operation regulations
specified in this document and the user manual.
•Use insulated tools when installing the device. For personal safety, wear proper personal
protective equipment (PPE).
(1) LED indicators
(2) Host panel
(3
) Screws for fixing the awning
(4
) Hole for the DC switch locking screw
(5
) DC switch (DC SWITCH)
(6
) Smart Dongle port
(7
) Communications port (COM)
(8
) DC input terminals (PV1–PV8)
(9
) Ventilation valves
(10
) AC output port
(11
) Spot-check terminal connection box
(12) Ground point
(13) Fan

2
2Installation Requirements
Dimensions
Angle Space
If inverters are installed in a place with abundant vegetation, in addition to routine weeding,
harden the ground underneath the inverters using cement or gravel (recommended area: 3 m x
2.5 m).
3Installing a Solar Inverter
•M12x40 bolt assemblies are supplied with
the solar inverter. If the bolt length does
not meet the installation requirements,
prepare M12 bolt assemblies by yourself
and use them together with the supplied
M12 nuts.
•This quick guide describes how to install a
solar inverter on a support. For details
about wall-mounted installation, see the
user manual.
•Before installing the mounting bracket,
remove the security Torx wrench and set it
aside.
Position for binding the
security Torx wrench

3
1. Install the mounting bracket.
Moving the Solar Inverter
It is recommended that anti-rust measures be taken on the positions for drilling holes.
2. Install the solar inverter onto the
mounting bracket.
3. Tighten the security Torx screws on both
sides.
Secure the screws on the sides before connecting cables.

4
Preparations
4.1
4Connecting Cables
No.
Cable
Type
Specifications
1
PE cable
Single
-core outdoor copper-
core cable
Conductor cross
-sectional area ≥ 5.5 mm2
2
AC output power
cable
Outdoor copper
-
core/aluminum
-core cable
•
Conductor cross-sectional area: 25-50
mm2outdoor copper-core cable or 35-
50 mm2outdoor aluminum-core cable
•
Cable outer diameter: 16–38 mm
3
DC input power
cable
Common outdoor PV cable in
the industry (recommended
model: PV1
-F)
•
Conductor cross-sectional area: 3.5–6
mm2
•
Cable outer diameter: 5.5–9 mm
4
(Optional) RS485
communications
cable
Two
-core outdoor shielded
twisted
pair
•
Conductor cross-sectional area: 0.2–1
mm2
•
Cable outer diameter: 4–11 mm
5
AC circuit
breaker
Recommended: three
-phase
AC circuit breaker
Rated voltage ≥
500 V AC
Rated
current: 125 A
•Do not connect loads between the inverter and the AC switch that directly connects to the
inverter. Otherwise, the switch may trip by mistake.
•If an AC switch is used with specifications beyond local standards, regulations, or Huawei's
recommendations, the switch may fail to turn off in a timely manner in case of exceptions,
causing serious faults.
Each inverter must be equipped with an AC output switch. Multiple inverters cannot connect to
the same AC output switch.
•To ensure that the inverter can be safely disconnected from the power grid when an
exception occurs, connect an AC switch to the AC side of the inverter. Select an appropriate
AC switch in accordance with local industry standards and regulations.
•The cable specifications must comply with local standards. Connect cables in accordance with
local installation laws and regulations.
•Before connecting cables, ensure that the DC switch of the solar inverter and all the switches
connected to it are set to OFF. Otherwise, the high voltage produced by the solar inverter
may cause electric shocks.

5
Connecting a PE Cable
4.2
•The PE point at the AC output port is used
only as a PE equipotential point, not a
substitute for the PE point on the
enclosure.
•It is recommended that silica gel or paint
be applied around the ground terminal
after the PE cable is connected.
Do not connect the neutral wire to the
enclosure as a PE cable. Otherwise, electric
shocks may occur.
Installing the AC Output Power Cable
4.3
•Use a socket wrench and extension rod to connect the AC power cable. The extension rod
must be longer than 100 mm.
•Sufficient slack should be provided in the PE cable to ensure that the last cable bearing the
force is the PE cable when the AC output power cable bears pulling force due to force
majeure.
•Do not install third-party devices in the AC connection box.
•You need to prepare M8 OT terminals by yourself.
1. Remove the AC terminal box and install partition boards.
Reserved PE point
•To avoid damaging the rubber liner, do not route a cable with a crimped OT terminal directly
through it.
•The cable colors in figures are for reference only. Select appropriate cables according to the
local standards.

6
2. Connect the AC output power cable (using a four-core cable as an example).

7
Installing DC Input Power Cables
4.4
When the DC input is not fully configured, the DC input terminals must meet the following
requirements:
•Evenly distribute DC input power cables to the four MPPTs. MPPT 1 and MPPT 4 are
preferred.
•Maximize the number of connected MPPTs.
Number of
PV Inputs
Terminal Selection
Number of
PV Inputs
Terminal Selection
1
PV1
2
PV1, PV7
3
PV1, PV3, PV7
4
PV1, PV3, PV5, PV7
5
PV1, PV2, PV3, PV5, PV7
6
PV1, PV2, PV3, PV5, PV7, PV8
7
PV1, PV2, PV3, PV4, PV5, PV7,
PV8
8
PV1, PV2, PV3, PV4, PV5, PV6, PV7,
PV8
•Use the positive and negative Amphenol Helios H4 metal terminals and DC connectors
supplied with the solar inverter. Using incompatible positive and negative metal terminals
and DC connectors may result in serious consequences. The caused device damage is not
covered under any warranty.
•For models of the crimping tool and removal wrench, use the recommended model or
contact your Amphenol dealer.
•Ensure that the PV module output is well insulated to ground.
•The DC input voltage of the SUN2000 shall not exceed 1100 V DC under any circumstance.
•Before installing DC input power cables, label the cable polarities to ensure correct cable
connections.
•If a DC input power cable is reversely connected and the DC switch is turned on, do not
operate on the DC switch or the positive/negative connectors immediately. Otherwise, the
device may be damaged. The caused device damage is not covered under any warranty. Wait
until the night when solar irradiance declines and the PV string current drops to below 0.5 A.
Then set the DC switch to the OFF position, remove the positive and negative connectors, and
correct the polarity of the DC input power cable.

8
1. Connect the DC power cables.
Positive connector
Negative
connector
Positive metal terminal
Negative metal terminal
Ensure that the cable
cannot be pulled out
after being crimped.
Click
Click
Ensure that the
cables are correctly
connected.
Use the wrench shown
in the figure to tighten
the locking nut. When
the wrench slips
during the
tightening,
the locking
nut has been
tightened.
(Optional) Installing the Smart Dongle
4.5
•The Smart Dongle is not provided in standard configuration.
•If your Smart Dongle is not equipped with a SIM card, prepare a standard SIM card (size: 25
mm x 15 mm) with the capacity greater than or equal to 64 KB.
•When installing the SIM card, determine its installation direction based on the silk screen
and arrow on the card slot.
•Press the SIM card in place to lock it, indicating that the SIM card is correctly installed.
•When removing the SIM card, push it inwards to eject it.
•For details about how to operate the 4G Smart Dongle SDongleA-03, see
SDongleA-03
Quick Guide (4G) .
•The quick guide is delivered with the Smart Dongle or can be obtained by scanning the QR
codes.

9
Smart Dongle port
Quick Guide
Installing the Signal Cable
4.6
•When laying out the signal cable, separate it from the power cable and keep it away from
strong interference sources to avoid strong communication interference.
•Ensure that the protective layer of the cable is inside the connector, that excess core wires
are cut off from the protection layer, that the exposed core wire is totally inserted into the
cable hole, and that the cable is connected securely.
When reinstalling the cover of the Smart Dongle,
ensure that the buckle springs back in place.