Huawei SUN2000-50KTL-ZHM3 User manual

SUN2000
-(50KTL-ZHM3, 50KTL-M3)
User Manual
Issue
01
Date
2022
-07-29
HUAWEI TECHNOLOGIES CO., LTD.

Issue 01 (2022-07-29)
Copyright © Huawei Technologies Co., Ltd.
i
Copyright © Huawei Technologies Co., Ltd. 2022. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and
the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,
information, and recommendations in this document are provided "AS IS" without warranties, guarantees or
representations of any kind, either express or implied.
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.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: https://e.huawei.com

SUN2000-(50KTL-ZHM3, 50KTL-M3)
User Manual
About This Document
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About This Document
Overview
This document describes the SUN2000-50KTL-ZHM3 and SUN2000-50KTL-M3 (also
referred to as SUN2000) in terms of their installation, electrical connections, commissioning,
maintenance, and troubleshooting. Before installing and operating the SUN2000, ensure that
you are familiar with the features, functions, and safety precautions provided in this
document.
Intended Audience
This document is applicable to:
Installers
Users
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
Indicates a hazard with a high level of risk which,
if not avoided, will result in death or serious
injury.
Indicates a hazard with a medium level of risk
which, if not avoided, could result in death or
serious injury.
Indicates a hazard with a low level of risk which,
if not avoided, could result in minor or moderate
injury.
Indicates a potentially hazardous situation which,
if not avoided, could result in equipment damage,
data loss, performance deterioration, or
unanticipated results.
NOTICE is used to address practices not related to
personal injury.

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Symbol Description
Supplements the important information in the
main text.
NOTE is used to address information not related
to personal injury, equipment damage, and
environment deterioration.
Change History
Changes between document issues are cumulative. The latest document issue contains all
changes made in earlier issues.
Issue 02 (2022-08-30)
Added the SUN2000-50KTL-M3 model.
Updated 5.2 Preparing Cables.
Updated 5.4 Connecting the AC Output Power Cable.
Updated 5.5 Installing the DC Input Power Cable.
Updated 10 Technical Specifications.
Updated A Grid Codes.
Issue 01 (2022-05-20)
This issue is the first official release.

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Contents
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Contents
About This Document.................................................................................................................... ii
1 Safety Information........................................................................................................................1
1.1 General Safety .............................................................................................................................................................. 1
1.2 Personnel Requirements ............................................................................................................................................... 2
1.3 Electrical Safety............................................................................................................................................................ 3
1.4 Installation Environment Requirements ....................................................................................................................... 4
1.5 Mechanical Safety ........................................................................................................................................................ 4
1.6 Commissioning............................................................................................................................................................. 5
1.7 Maintenance and Replacement ..................................................................................................................................... 6
2 Overview.........................................................................................................................................7
2.1 Product Introduction ..................................................................................................................................................... 7
2.2 Appearance ................................................................................................................................................................... 9
2.3 Label Description........................................................................................................................................................ 10
2.4 Working Principles ..................................................................................................................................................... 11
2.4.1 Circuit Diagram ....................................................................................................................................................... 11
2.4.2 Working Modes........................................................................................................................................................ 12
3 SUN2000 Storage.........................................................................................................................14
4 Installation....................................................................................................................................15
4.1 Checking Before Installation ...................................................................................................................................... 15
4.2 Tool Preparation.......................................................................................................................................................... 15
4.3 Selecting an Installation Position................................................................................................................................ 17
4.4 Moving the SUN2000................................................................................................................................................. 21
4.5 Installing the Mounting Bracket ................................................................................................................................. 22
4.5.1 Support-mounted Installation .................................................................................................................................. 23
4.5.2 Wall-mounted Installation........................................................................................................................................ 24
4.6 Installing a SUN2000 ................................................................................................................................................. 26
5 Electrical Connections................................................................................................................28
5.1 Precautions.................................................................................................................................................................. 28
5.2 Preparing Cables......................................................................................................................................................... 29
5.3 Connecting the PE Cable ............................................................................................................................................ 31
5.4 Connecting the AC Output Power Cable .................................................................................................................... 33

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5.5 Installing the DC Input Power Cable .......................................................................................................................... 39
5.6 (Optional) Installing the Smart Dongle....................................................................................................................... 43
5.7 Connecting the Signal Cable....................................................................................................................................... 45
5.7.1 Communication Modes............................................................................................................................................ 47
5.7.2 (Optional) Connecting the RS485 Communications Cable to the SUN2000........................................................... 48
5.7.3 (Optional) Connecting the RS485 Communications Cable to the Power Meter...................................................... 49
5.7.4 (Optional) Connecting the Power Grid Scheduling Signal Cable............................................................................ 50
6 Commissioning............................................................................................................................52
6.1 Checking Before Power-On........................................................................................................................................ 52
6.2 System Power-On ....................................................................................................................................................... 53
7 Man-Machine Interaction..........................................................................................................55
7.1 Scenario in Which SUN2000s Are Connected to the FusionSolar Smart PV Management System........................... 56
7.1.1 (Optional) Registering an Installer Account ............................................................................................................ 56
7.1.2 Creating a PV Plant and a User................................................................................................................................ 57
7.1.3 SmartLogger Networking Scenario ......................................................................................................................... 58
7.2 Scenario in Which SUN2000s Are Connected to Other Management Systems ......................................................... 58
7.3 Energy Control............................................................................................................................................................ 58
7.3.1 Grid-tied Point Control ............................................................................................................................................ 58
7.3.2 Apparent Power Control on the Inverter Output Side.............................................................................................. 62
8 Maintenance.................................................................................................................................64
8.1 System Power-Off....................................................................................................................................................... 64
8.2 Routine Maintenance .................................................................................................................................................. 65
8.3 Troubleshooting .......................................................................................................................................................... 66
8.4 Replacing a Fan .......................................................................................................................................................... 75
9 Handling the Inverter.................................................................................................................78
9.1 Removing the SUN2000............................................................................................................................................. 78
9.2 Packing the SUN2000................................................................................................................................................. 78
9.3 Disposing of the SUN2000 ......................................................................................................................................... 78
10 Technical Specifications ..........................................................................................................79
A Grid Codes...................................................................................................................................83
B Device Commissioning .............................................................................................................87
C Built-in PID Recovery ...............................................................................................................89
D Resetting Password ...................................................................................................................90
E Setting Dry Contact Scheduling Parameters.........................................................................91
F AFCI...............................................................................................................................................92
G Smart I-V Curve Diagnosis......................................................................................................94

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H Acronyms and Abbreviations..................................................................................................95

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1 Safety Information
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1 Safety Information
1.1 General Safety
Statement
Before installing, operating, and maintaining the equipment, read this document and observe
all the safety instructions on the equipment and in this document.
The "NOTICE", "CAUTION", "WARNING", and "DANGER" statements in this document
do not cover all the safety instructions. They are only supplements to the safety instructions.
Huawei will not be liable for any consequence caused by the violation of general safety
requirements or design, production, and usage safety standards.
Ensure that the equipment is used in environments that meet its design specifications.
Otherwise, the equipment may become faulty, and the resulting equipment malfunction,
component damage, personal injuries, or property damage are not covered under the warranty.
Follow local laws and regulations when installing, operating, or maintaining the equipment.
The safety instructions in this document are only supplements to local laws and regulations.
Huawei will not be liable for any consequences of the following circumstances:
Operation beyond the conditions specified in this document
Installation or use in environments which are not specified in relevant international or
national standards
Unauthorized modifications to the product or software code or removal of the product
Failure to follow the operation instructions and safety precautions on the product and in
this document
Equipment damage due to force majeure, such as earthquakes, fire, and storms
Damage caused during transportation by the customer
Storage conditions that do not meet the requirements specified in this document
General Requirements

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Do not work with power on during installation.
Do not install, use, or operate outdoor equipment and cables (including but not limited to
moving equipment, operating equipment and cables, inserting connectors to or removing
connectors from signal ports connected to outdoor facilities, working at heights, and
performing outdoor installation) in harsh weather conditions such as lightning, rain,
snow, and level 6 or stronger wind.
After installing the equipment, remove idle packing materials such as cartons, foam,
plastics, and cable ties from the equipment area.
In the case of a fire, immediately leave the building or the equipment area, and turn on
the fire alarm bell or make an emergency call. Do not enter the building on fire in any
case.
Do not scrawl, damage, or block any warning label on the equipment.
Tighten the screws to the specified torque using tools when installing the equipment.
Understand the components and functioning of a grid-tied PV power system and relevant
local standards.
Repaint any paint scratches caused during equipment transportation or installation in a
timely manner. Equipment with scratches cannot be exposed to an outdoor environment
for a long period of time.
Do not open the host panel of the equipment.
You shall not reverse engineer, decompile, disassemble, adapt, add code to the device
software or alter the device software in any other way, research the internal
implementation of the device, obtain the device software source code, infringe on
Huawei's intellectual property, or disclose any device software performance test results.
Personal Safety
If there is a probability of personal injury or equipment damage during operations on the
equipment, immediately stop the operations, report the case to the supervisor, and take
feasible protective measures.
Use tools correctly to avoid hurting people or damaging the equipment.
Do not touch the energized equipment, as the enclosure is hot.
1.2 Personnel Requirements
Personnel who plan to install or maintain Huawei equipment must receive thorough
training, understand all necessary safety precautions, and be able to correctly perform all
operations.
Only qualified professionals or trained personnel are allowed to install, operate, and
maintain the equipment.
Only qualified professionals are allowed to remove safety facilities and inspect the
equipment.
Personnel who will operate the equipment, including operators, trained personnel, and
professionals, should possess the local national required qualifications in special
operations such as high-voltage operations, working at heights, and operations of special
equipment.

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Only professionals or authorized personnel are allowed to replace the equipment or
components (including software).
Professionals: personnel who are trained or experienced in equipment operations and are clear of the
sources and degree of various potential hazards in equipment installation, operation, and
maintenance
Trained personnel: personnel who are technically trained, have required experience, are aware of
possible hazards on themselves in certain operations, and are able to take protective measures to
minimize the hazards on themselves and other people
Operators: operation personnel who may come in contact with the equipment, except trained
personnel and professionals
1.3 Electrical Safety
Grounding
For the equipment that needs to be grounded, install the ground cable first when
installing the equipment and remove the ground cable last when removing the
equipment.
Do not damage the ground conductor.
Do not operate the equipment in the absence of a properly installed ground conductor.
Ensure that the equipment is connected permanently to the protective ground. Before
operating the equipment, check its electrical connection to ensure that it is securely
grounded.
General Requirements
Before connecting cables, ensure that the equipment is intact. Otherwise, electric shocks or
fire may occur.
Ensure that all electrical connections comply with local electrical standards.
Obtain approval from the local electric utility company before using the equipment in
grid-tied mode.
Ensure that the cables you prepared meet local regulations.
Use dedicated insulated tools when performing high-voltage operations.
AC and DC Power
Do not connect or disconnect power cables with power on. Transient contact between the core
of the power cable and the conductor will generate electric arcs or sparks, which may cause
fire or personal injury.

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Before making electrical connections, switch off the disconnector on the upstream device
to cut off the power supply if people may contact energized components.
Before connecting a power cable, check that the label on the power cable is correct.
If the equipment has multiple inputs, disconnect all the inputs before operating the
equipment.
Cabling
When routing cables, ensure that a distance of at least 30 mm exists between the cables
and heat-generating components or areas. This prevents damage to the insulation layer of
the cables.
Bind cables of the same type together. When routing cables of different types, ensure that
they are at least 30 mm away from each other.
Ensure that the cables used in a grid-tied PV power system are properly connected and
insulated and meet specifications.
1.4 Installation Environment Requirements
Ensure that the equipment is installed in a well ventilated environment.
To prevent fire due to high temperature, ensure that the ventilation vents or heat
dissipation system are not blocked when the equipment is running.
Do not expose the equipment to flammable or explosive gas or smoke. Do not perform
any operation on the equipment in such environments.
1.5 Mechanical Safety
Using Ladders
Use wooden or fiberglass ladders when you need to perform live working at heights.
When a step ladder is used, ensure that the pull ropes are secured and the ladder is held
firm.
Before using a ladder, check that it is intact and confirm its load bearing capacity. Do not
overload it.
Ensure that the wider end of the ladder is at the bottom, or protective measures have
been taken at the bottom to prevent the ladder from sliding.
Ensure that the ladder is securely positioned. The recommended angle for a ladder
against the floor is 75 degrees, as shown in the following figure. An angle rule can be
used to measure the angle.

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When climbing a ladder, take the following precautions to reduce risks and ensure
safety:
−Keep your body steady.
−Do not climb higher than the fourth rung of the ladder from the top.
−Ensure that your body's center of gravity does not shift outside the legs of the
ladder.
Drilling Holes
When drilling holes into a wall or floor, observe the following safety precautions:
Wear goggles and protective gloves when drilling holes.
When drilling holes, protect the equipment from shavings. After drilling, clean up any
shavings that have accumulated inside or outside the equipment.
Moving Heavy Objects
Be cautious to avoid injury when moving heavy objects.
When moving the equipment by hand, wear protective gloves to prevent injuries.
1.6 Commissioning
When the equipment is powered on for the first time, ensure that professional personnel set
parameters correctly. Incorrect settings may result in inconsistency with local certification and
affect the normal operation of the equipment.

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1.7 Maintenance and Replacement
High voltage generated by the equipment during operation may cause an electric shock, which
could result in death, serious injury, or serious property damage. Prior to maintenance, power
off the equipment and strictly comply with the safety precautions in this document and
relevant documents.
Maintain the equipment with sufficient knowledge of this document and using proper
tools and testing equipment.
Before maintaining the equipment, power it off and follow the instructions on the
delayed discharge label to ensure that the equipment is powered off.
Turn off the AC and DC switches of the SUN2000 when maintaining the electric
equipment or power distribution equipment connected the SUN2000.
Place temporary warning signs or erect fences to prevent unauthorized access to the
maintenance site.
If the equipment is faulty, contact your dealer.
The equipment can be powered on only after all faults are rectified. Failing to do so may
escalate faults or damage the equipment.

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2 Overview
2.1 Product Introduction
Function
The SUN2000 inverter is a three-phase grid-tied PV string inverter that converts the DC
power generated by PV strings into AC power and feeds the power into the power grid.
Model
This document covers the following SUN2000 models:
SUN2000-50KTL-ZHM3
SUN2000-50KTL-M3
Figure 2-1 Model description
Table 2-1 Model description
ID Meaning Value
1 Series name SUN2000: three-phase grid-tied PV string inverter
2 Power class 50K: rated power of 50 kW
3 Topology TL: transformerless
4 Region ZH: China
5 Product code M3: product series with an input voltage level of
1100 V DC

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Networking Application
The SUN2000 applies to the grid-tied systems of industrial and commercial rooftops and
small ground PV plants. Typically, a grid-tied system consists of PV strings, grid-tied
inverters, AC switches, and power distribution units.
Figure 2-2 Networking application - single inverter scenario
(1) PV string (2) SUN2000 (3) AC power distribution
unit
(4) Isolation transformer (5) Power grid
Supported Power Grid Types
The SUN2000 supports TN-S, TN-C, TN-C-S, TT, and IT power grids.
Figure 2-3 Power grid types

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2.2 Appearance
Figure 2-4 Appearance
(1) LED indicator (2) Front panel
(3) Screws for fixing the awning (4) Communications port (COM)
(5) Hole for the DC switch locking screw (6) DC switch (DC SWITCH)
(7) Smart Dongle port (4G/WLAN-FE) (8) Ventilation valve
(9) DC input terminals (PV1–PV8) (10) AC output port
(11) Ground point (12) Fan

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2.3 Label Description
Enclosure Labels
Symbol Name Description
Delay discharge Residual voltage exists
after the SUN2000 is
powered off. It takes 5
minutes for the SUN2000
to discharge to the safe
voltage.
Burn warning Do not touch a running
SUN2000 because it
generates high
temperatures on the shell.
Electric shock warning High voltage exists
after the SUN2000 is
powered on. Only
qualified and trained
electrical technicians
are allowed to perform
operations on the
SUN2000.
High touch current
exists after the
SUN2000 is powered
on. Before powering
on the SUN2000,
ensure that the
SUN2000 is properly
grounded.
Refer to documentation Reminds operators to
refer to the documents
delivered with the
SUN2000.
Grounding label Indicates the position for
connecting the PE cable.
Operation warning Do not remove the DC
input connector or AC
output connector with
power on.
Weight label The SUN2000 is heavy
and needs to be carried by
three persons.

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Symbol Name Description
Burn warning on inverter
handles
Do not touch the handles
within 10 minutes after
the inverter is shut down.
Indicator Indicates the SUN2000
operating information.
SUN2000 serial number Indicates the serial
number.
SUN2000 Wi-Fi login
QR code
Scan the QR code to
connect to the Huawei
SUN2000 Wi-Fi network.
2.4 Working Principles
2.4.1 Circuit Diagram
A SUN2000 can connect to a maximum of eight PV strings and has four MPPT circuits inside.
Each MPPT circuit tracks the maximum power point of two PV strings. The SUN2000

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converts DC power into single-phase AC power through an inverter circuit. Surge protection
is supported on both the DC and AC sides.
Figure 2-5 Schematic diagram
2.4.2 Working Modes
The SUN2000 can work in Standby, Operating, or Shutdown mode.
Figure 2-6 Working modes

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Table 2-2 Working mode description
Working
Mode
Description
Standby The SUN2000 enters Standby mode when the external environment does not
meet the operating requirements. In Standby mode:
The SUN2000 continuously performs status check and enters the
Operating mode once the operating requirements are met.
The SUN2000 enters Shutdown mode after detecting a shutdown
command or a fault after startup.
Operating In Operating mode:
The SUN2000 converts DC power from PV strings into AC power and
feeds the power to the power grid.
The SUN2000 tracks the maximum power point to maximize the PV
string output.
If the SUN2000 detects a fault or a shutdown command, it enters the
Shutdown mode.
The SUN2000 enters Standby mode after detecting that the PV string
output power is not suitable for connecting to the power grid for
generating power.
Shutdown In Standby or Operating mode, the SUN2000 enters Shutdown mode
after detecting a fault or shutdown command.
In Shutdown mode, the SUN2000 enters Standby mode after detecting a
startup command or that the fault is rectified.