Afore BNT KTL Series User manual

USER’S MANUAL
On-Grid PV Inverter
Anybuild Series：BNTxxxKTL(xxx=017,020)
Version：03.610100001721-V0.02

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USER’S MANUAL
INSTALLATION AND OPERATION
About Afore
Afore New Energy Technology (Shanghai) Co., Ltd., located in Shanghai, China, is an international PV
enterprise, which is specialized in manufacturing of solar PV inverters.
Afore is dedicated to providing perfect power conversion and control solutions for solar power generation
installations R&D, manufacturing and marketing of solar PV inverters. Afore possesses the first-class
production equipment and international R&D team. The core business is to provide all kinds of high-quality
and reliable grid-connected solar inverters and energy system solutions to satisfy the consistently
increasing demands for global energy.
The newly designed PV Inverter features itself with full load high efficiency, high reliability and user-friendly
interface. The maximum conversion efficiency of our inverter is up to 98%. A user-friendly installation &
interface, professional industrial design, and design for reliability mechanism, give the Inverter Family a
competitive edge for customers from all regions.
As a customer-oriented company, Afore is always trying to improve herself and enhance customer
satisfaction. High quality is the fountain of life for Afore, not just in product quality control, but also in
quality of service and support. Afore is able to help customers reduce energy consumption and carbon
dioxide emissions by leading green solutions.

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CONTENTS
1 ABOUT THIS MANUAL.............................................................................................................................................................. 3
1.1 SCOPE OF VALIDITY ................................................................................................................................................................. 3
1.2 TARGET GROUP ..................................................................................................................................................................... 3
1.3 ADDITIONAL INFORMATION ....................................................................................................................................................... 3
2 SAFETY INSTRUCTIONS ............................................................................................................................................................ 3
2.1 SAFETY PRECAUTIONS.............................................................................................................................................................. 3
2.2 EXPLANATIONS OF SYMBOLS ..................................................................................................................................................... 4
3 UNPACKING ............................................................................................................................................................................. 5
3.1 ASSEMBLY PARTS .................................................................................................................................................................... 5
3.2 IDENTIFYING THE INVERTER ....................................................................................................................................................... 5
4 MOUNTING ............................................................................................................................................................................. 6
4.1 SAFETY ................................................................................................................................................................................ 6
4.2SELECTING THE APPROPRIATE MOUNTING LOCATION ....................................................................................................................... 6
4.3MOUNTING THE INVERTER WITH WALL MOUNTING BRACKET ............................................................................................................ 7
5 ELECTRICAL CONNECTION ........................................................................................................................................................ 9
5.1 OVERVIEW OF THE CONNECTION AREA ........................................................................................................................................ 9
5.2 CONNECTION TO THE PUBLIC GRID (AC) .................................................................................................................................... 10
5.3 CONNECTION TO THE PV GENERATOR (DC) ................................................................................................................................ 11
6 SYSTEM DIAGRAM ................................................................................................................................................................. 15
7 OPERATION............................................................................................................................................................................ 16
7.1 OVERVIEW OF CONTROLS AND DISPLAYS .................................................................................................................................... 17
7.2 COMMISSIONING ................................................................................................................................................................. 17
7.3 ANYBUILD SERIES LED DISPLAY ................................................................................................................................................ 18
7.4 ANYBUILD SERIES LCD DISPLAY................................................................................................................................................ 19
8 TECHNICAL DATA.................................................................................................................................................................... 23
9 TROUBLE SHOOTING .............................................................................................................................................................. 25
10 CONTACT ............................................................................................................................................................................. 29
ANNEX WARRANTY TERMS (OVERSEAS) ................................................................................................................................... 30

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1 About This Manual
1.1 Scope of Validity
This manual describes the installation, commissioning, operation and maintenance of the following on-grid PV
inverters produced by Afore New Energy:
Anybuild Series(Double MPPT Trackers)
BNT017KTL BNT020KTL
Please keep this manual all time available in case of emergency.
1.2 Target Group
This manual is for qualified personnel. The tasks described in this manual must only be performed by qualified
personnel.
1.3 Additional Information
For more information about Afore products, please download from our website www.aforenergy.com
2 Safety Instructions
2.1 Safety Precautions
1. All work on the inverter must be carried out by qualified electricians. And ensure that children can not
access to the equipment.
2. The device may only be operated with PV generators. Do not connect any other sources of energy to the
device.
3. The PV generator and inverter must be connected to the ground in order to reach maximum protection for
property and persons.
4. Do not touch cover until 3 minutes after disconnecting all sources of supply. This is because the charge
stored in capacitors may result a risk of electric shock.
5. The enclosure of Inverter can become hot during operation. To reduce the risk of injury, do not touch the
cover, heat sink at the back of the PV-Inverter or nearby surfaces while Inverter is operating.

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6. Do not use the equipment for purposes other than those described in this manual.
7. Both the inverter and associated transport packaging are mainly made of recyclable raw materials. Please
ensure that the used device and any relevant accessories are disposed of in accordance with applicable
regulations.
8. Packed with damping EPE and carton, Afore inverter should be placed upwards and handled with care in
delivery. Pay attention to waterproof.
9.Alternative uses, modifications to the inverter not recommended by Afore or the installation of components
not sold by Afore New Energy void the warranty claims.
2.2 Explanations of Symbols
Symbol Explanation
Danger of Electric Shock.
The inverter is directly connected with the public grid. All work on the
inverter must be carried out by qualified personnel only.
Beware of hot surface.
The inverter can become hot during operation. Do not contact the device
during operation.
Caution, risk of electric shock
Energy storage timed discharge, time to be indicated adjacent to the symbol.
Caution, Danger.
This device directly connected with electricity generators and public grid.
Do not dispose of this device with the normal domestic waste.
Without Transformer.
This inverter does not use transformer for the isolation function.
CE mark.
The inverter complies with the requirements of the applicable EC guidelines.
Regulatory compliance mark.
The inverter complies with the requirements of Australian Communications
Authority guidelines, safety and EMC guidelines.
Notes, Important.
Non-adherence to these instructions may adversely affect the operating
convenience or functionality of the device.
Refer to manual before service.

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3 Unpacking
3.1 Assembly Parts
Please check the delivery for completeness and any visible external damage. Contact your dealer at once if
anything is damaged or missing.
BNTxxxKTL（xxx=017, 020）assembly parts are as listed below：
Object Quantity Description Object Quantity Description
A 1 Solar inverter B 1 Wall mounting bracket
C 1 User manual D 1 Certificate of inspection
E 1 Installation diagram F 1 Notice for installation
G 1 Warranty card H 1 RV5.5-6 terminal
I 3 Plastic Expansion Tube J 3 Tapping screw
K 1 Security screw L 1 Screwdriver for security screw
M 4 sets DC plug connector N 4 Screw
O 1 Waterproof Junction Box P 1 GPRS/Wi-Fi Monitoring Module
Q 4 Terminal
3.2 Identifying the Inverter
You can identify the inverter by the type label. Information such as serial number (Serial No.) and model name
of the inverter, as well as the device’stechnical parameters are specified on the type label. The type label is on
the right side of the enclosure.

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4 Mounting
4.1 Safety
DANGER!
Danger to life due to potential fire or electric shock.
Do not install the inverter near any inflammable or explosive items. The inverter will be directly
connected with high voltage power generation device. The installation must be performed by
qualified personnel only in compliance with national or local standards and regulations.
CAUTION!
Danger of burn injuries due to hot enclosure parts.
•Install the inverter so that it cannot be touched inadvertently.
Risk of injury due to the heavy weight of the inverter.
• Take the inverter's weight into account for mounting.（Weight of inverter refers to chapter 9.）
4.2Selecting the Appropriate Mounting Location
Consider the following points when selecting where to install:
• The mounting method and location must be suitable for the inverter's weight and dimensions.
• The inverter must be installed in the solid walls ,such as brick walls or concrete walls,in case of vibration
noise or inverter falling off.
• The installation site should be clearly visible and can be safely into without aids such as scaffold.
• For the convenience of checking the LCD display and possible maintenance activities, please install the
inverter at eye level.
• The altitude of installation site should be below 2000m,more than 2000m above the sea level will cause
derating.
• The ambient temperature of installation site should be between -20 °C and +55 °C (between -4 °F and
131 °F).
• Install the inverter directly exposing to strong sunshine is not recommended, the excess heating might lead
to power reduction.
• Leave enough effective space around the inverter for better ventilation.

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• Vertical installation, wiring area must be downside, lateral installation is not allowed; in backward tilted
installation, tilt angle should not exceed 30 degrees; Forward tilted, horizontal or inverted installation is not
allowed.
4.3Mounting the Inverter with Wall Mounting Bracket
1. Use the wall mounting bracket mark the drilling position and drill the holes for the screws.

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2. Fix the wall mounting bracket with the equipped self-tapping screw.
3. Hang the inverter to the mounting bracket and ensure the slot is fitted on the bracket.
4. Check to ensure the inverter is correctly seated. Make sure to lock it with the security screws. (See the
figure below.)

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5 Electrical Connection
Notes:
1. Electrical installation & maintenance shall be conducted by licensed electrician and shall comply with local
Wiring Rules.
2. After the inverter has been installed in its fixed position, the electrical connection to the unit can be
established.
3. Make sure Max. Open Voltage and short-circuit current of the each PV strings accord with the Spec.
4. Choose the appropriate cable width for AC/DC wire. The cross sectional area of DC input conductor lead
should be 4mm2PV wire, that of AC output conductor should also be 4mm2cooper wire, and that of
external ground conductor should be 4mm2cooper wire.
5. On both sides of inverter to the grid and PV array, there must be between circuit breaker and surge
protector, and during inverter electrical connections, circuit breakers on both sides should be disconnected
to prevent electric shock.
6. Before connecting the inverter to PV arrays and public grid, make sure the polarity is correct.
5.1 Overview of the Connection Area
The following figures show the assignment of the individual connection areas on the bottom of the inverter.
Object Description
a DC connectors ( + ) for connecting the PV strings
b DC connectors ( − ) for connecng the PV strings
c WiFi/RS485 Communication Waterproof Connector
d Waterproof Junction Box, AC connection

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e DC Switch
5.2 Connection to the Public Grid (AC)
5.2.1 Conditions for Connection
CAUTION!
Unit Disconnection From Load
Disconnect the circuit breakers and switches of inverters AC and DC sides.
5.2.2 Connection to Public Grid (AC)
Measure the grid voltage to make sure within the permissible range. Disconnect the circuit breaker between
the inverter and the grid.
1． Disconnect the DC and AC breaker, DC switch in
the"OFF"state..
3．Open the WiFi protection cover and plug in the
WiFi.
2．Assembly yellow-green Ground wire RV5.5-6
terminal, and connect to one ground terminal.
4．Prepare AC cable（Φ4mm2 or bigger）, stripping
length is 14±0.5mm. Connect the cable with
terminals.

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5．Run the cable harness with the pressed terminals
through the junction box and insert the black cable
harness, L1, L2 and L3 into the caps of N, W, V and U
as shown in the system connection diagram. Tighten
the screws.
6. Close junction box and tight the screws
5.3 Connection to the PV Generator (DC)
CAUTION!
Unit Disconnection From Load
Disconnect circuit breakers and switches on both DC and AC sides.
5.3.1 Conditions for the DC Connection
• The connected PV modules must meet following requirements
– Same type
– Same model
– Identical alignment
– Identical tilt
• The following limit values at the DC input of the inverter must not be exceeded (connecting to a higher
voltage will destroy the device):
Type
Maximum input voltage [V
d.c
]
Maximum input current [A
d.c
]
BNT017KTL
1000
2
1*2
BNT020KTL
1000
22
*2
5.3.2 Assembling the DC Plug Connector
In order to connect to the inverter, all connection cables of the PV modules must be equipped with the DC

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plug connectors provided. You will find the necessary DC plug connector for DC connection in the package.
To assemble the DC plug connectors, proceed as detailed below. Ensure the plug connectors have the
correct polarity.
The plug connector in DC side includes male and female as blow.
Please note that the sizes of metal connecting tubes are different. The bigger one is for female connector
and the smaller one is for male connector.
Assembly Instructions:
◆ Prepare the DC wire to connect the positive and negative DC arrays. Stripping length is 12～15mm，
sectional area is 4 mm2 as below.
◆ Insert the DC wire to metal connecting tube. Make sure all line heads are in the connecting tube as
picture blow.
Female Connector
Male Connector
Stripping length is 12~15mm, sectional area is 4mm
2

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◆ Use crimping pliers to fasten the metal connecting tube and copper wire. Make sure the harness will
not fall off, see picture below.
◆ Insert the assembled cable into male/ female connector. A “chick” sound can be heard when
connecting correctly. Then tighten the cap. Refer to the picture below.
Positive PV Array
Negative PV Array

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5.3.3 Connecting the PV Generator (DC)
DANGER!
Danger to life due to high voltage in the inverter.
• Before connecting the PV generator, ensure that the AC&DC circuit breaker is switched off.
Notes:
1. Make sure that you have disconnected circuit breakers and switches on both DC and AC sides.
2. Check the connection cables of the PV modules for correct polarity and that the maximum input voltage
of the inverter is not exceeded.
3. Check the DC plug connector for correct polarity and well connected.
Plug the DC plug connectors into DC terminals on inverter.
Double MPPT trackers model: BNTxxxKTL(xxx=017,020). The device is equipped with 2 groups of DC(DC-A
and DC-B) of connecting sockets for DC input, and each group contains a pair of connecting sockets (DC+
and DC-). Group A and B are respectively connected to two DC arrays as picture below. Connect PV+ and
PV- in PV Array 1 to the positive and negative poles of DC-A and those of PV2 to those of DC-B.

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6 System Diagram
The typical connection diagram for the entire PV system is shown in the following figure.
1.PV Panel: Provide DC power to inverter
2. Inverters: Converts DC (Direct Current) power from PV panel(s) to AC (Alternating Current) power.
Because Inverter is grid-connected, it controls the current amplitude according to the PV Panel power
supply. Inverter always tries to convert the maximum power from the PV array.
3. QF1/QF2 Breaker: The current per DC string does not exceed 25A.
4. QF3 Breaker: Refer to the following table to choose the AC breaker.
Note:
QF1、QF2 : DC Breaker
QF3 : AC Breaker
SPD : Surge Protector

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Refer to the following table to choose the AC breaker.
T
ype
Max
AC Current [A]
Rate current of
AC breaker[A]
BNT017KTL
30
40
BNT020KTL
32
40
5. SPD: Lightning protection system, refer to the following options:
AC side, nominal discharge current 20KA, second grade lightning protection, protection voltage 2.5KV
DC side, nominal discharge current 20KA, second grade lightning protection, protection voltage 3.2KV
6. The wiring distance between the inverter and the distribution box should be at least 5 meters.
7. Utility: Referred to as “grid” in this manual, i.e. the media your electric power company provides power
to your place. Please note that Inverter can only be connected to low-voltage systems (namely, 220/230Vac,
50/60Hz).
7 Operation
Product Overview

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7.1 Overview of Controls and Displays
There are four function keys on the front panel: UP, DOWN, ESC, ENT.The keypad is used for:
Scrolling the displayed parameter :Up and Down keys, or modify the adjustable parameters;
Cancel or Enter: Esc and Ent keys.
7.2 Commissioning
After completing of the mechanical and electrical installation, the inverter could be put into operation.
Enclosure Lid
KEY
LCD
LED Light
LCD Display

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1. Switch off DC and AC side circuit breakers and switches.
2. Wait until the screen is on and set up grid connection standard. (Please refer to 7.4.1 for specific
operations)
The inverter starts up and feed into the utility grid automatically when all the necessary conditions of
normal operation for the inverter is fulfilled.
3. Check whether the display and LEDs are indicating a normal operating state.
Sign
Color
Instructions
POWER
Green
On
:
Power On
COM
Green
On
:
Normal Operation
and feed into the utility grid
FAULT
Red
Flash
: Check wiring
7.3 Anybuild Series LED Display
Three LED lights are assembled on the inverter, COM, POWER, FAULT. When DC and AC power are normal
and the inverter starts up,the POWER LED turns on.When the inverter is operating and feed electricity into
the utility grid normally, the COM LED turns on. When there is faulty in the PV system or inverter, the FAULT
LED flashes, and the faulty code will be shown on LCD screen.
POWER LED (Green)
POWER LED turns on when DC voltage reaches the start-up voltage and turns off when it falls below a
certain value. POWER LED is on represents inverter is active and so is the inverter control system. If POWER
LED is off, inverter cannot be normally started up.
Under normal operation conditions, when sun light is sufficient, inverter start up generates electricity in the
morning and stops after dark. This procedure may repeat several times in one day, especially in morning
and at night. It is a normal working phenomenon but not a wrong signal.
COM LED (Green)
The COM LED turns on when the inverter start to feed electricity into grid. And the COM LED is off when
the inverter is standby.
FAULT LED Flashes (Red)
Red FAULT LED flashes means the on-grid generation is stopped due to some faults. Please wait 10 minutes
to be sure whether the fault is temporary. If yes, inverter will automatically restart again. If not, contact
after-sales personnel.

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7.4 Anybuild Series LCD Display
Inverter will start up automatically with enough DC voltage provided by PV array. When starting up (POWER
LED is on), it shows “Afore New Energy” on LCD in front of the inverter.
The inverter will delay 1 second and automatically jump to the System Checking interface
7.4.1 First Boot Setting
When first time turned on the power, the inverter will automatically jump to the reminder interface to set
country.
Press Ent to country and standard setting interface. Press UP and DOWN to show countries. Choose
corresponding country and standard and press Ent.
Country setting completed, system will automatically jump to the reminder interface to set time.