Huawei SUN2000-75KTL Series User manual

HUAWEI TECHNOLOGIES CO., LTD.
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
Quick Guide
Issue: 19
Part Number: 31500HGH
Date: 2022-05-20

1
1Overview
Copyright © Huawei Technologies Co., Ltd. 2022.
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 certified electricians 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)
Panel
(2) LED indicators
(3) Maintenance compartment door
(4) Mounting bracket
(5) External fan tray
Front View
The DC switch of the current model can be manual or automatic.
Port Description (Manual DC Switch)

2
(1) DC input terminal group 1 (PV1
–PV8,
controlled by DC SWITCH 1)
(2) (Optional) Screw hole for DC switch 1
(3) DC switch 1 (DC SWITCH 1)
(4) DC input terminal group 2 (PV9
–PV14,
controlled by DC SWITCH 2)
(5) (Optional) Screw hole for DC switch 2
(6) DC switch 2 (DC SWITCH 2)
(7) DC input terminal group 3 (PV15
–PV20,
controlled by DC SWITCH 3)
(8) (Optional) Screw hole for DC switch 3
(9) DC switch 3 (DC SWITCH 3)
(10) Ventilation valve
(11) USB port
(12) Communications port (COM)
(13) Hole for the AC output power cable
(14) Hole for the tracking system power cable
(1) DC input terminal group 1 (PV1
–PV8,
controlled by DC SWITCH 1)
(2) (Optional) Screw hole for DC switch 1
(3) DC switch 1 (DC SWITCH 1)
(4) Reset button 1
(RESET 1)
(5) DC input terminal group 2 (PV9
–PV14,
controlled by DC SWITCH 2)
(6) (Optional) Screw hole for DC switch 2
(7) DC switch 2 (DC SWITCH 2)
(8) Reset button 2
(RESET 2)
(9) DC input terminal group 3 (PV15
–PV20,
controlled by DC SWITCH 3)
(10) (Optional) Screw hole for DC switch 3
(11) DC switch 3 (DC SWITCH 3)
(12) Reset button 3
(RESET 3)
(13) Ventilation valve
(14) USB port
(15) Communications port (COM)
(16) Hole for the AC output power cable
(17) Hole for the tracking system power cable
Port Description (Automatic DC Switch)
DC Switch Description
The DC switches automatically turn off when a fault occurs in the inverters (LED4 is steady red,
and the three DC switches are OFF). In this case, contact your technical support. Do not turn on
the DC switches by yourself.

3
2Installation Requirements
Recommended: 600 mm ≤ Bottom space ≤ 730 mm
Angle Space
Dimensions
Switch
Component
Description
DC SWITCH
ON
The DC switch is ON and can automatically turn off for protection.
The DC switch is ON but cannot automatically turn off for protection.
OFF
The DC switch is OFF.
RESET
•
When the DC switch automatically turns off for protection, the RESET button
will be released.
•When the RESET button is not pressed, the DC switch can only be turned to the
unloaded position , and cannot be set to the ON position.
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).

4
Use the handles
to facilitate
installation.
Handles are
optional and
delivered
separately.
Ensure that the
handles are
securely
installed. After
the installation
is complete,
remove the
handles and set
them aside.
Installation Positions of
Handles During Installation
Installation Positions of
Handles During Transportation
1. Install the mounting bracket.
It is recommended that anti-rust measures be taken on the positions for drilling holes.
3Installing a Solar Inverter
•This quick guide describes how to install a solar
inverter on a support. For details about wall-
mounted installation, see the user manual.
•The M12x40 bolt assemblies are delivered with the
solar inverter. If the bolt assembly length does not
meet the installation requirements, prepare M12
bolt assemblies by yourself and use them together
with the delivered M12 nuts.
•Before installing the mounting bracket, remove the
security Torx wrench and set it aside.
Position for binding the
security Torx wrench

5
3. Install the solar inverter onto the mounting bracket. 4. Tighten security Torx screws.
2. (Optional) Install screws for locking DC switches.
•According to Australian standards, the screws for DC switches are delivered with solar
inverters. The screws are used to secure DC switches (DC SWITCH 1, DC SWITCH 2, and DC
SWITCH 3) to prevent them from being turned on by mistake.
•For the model used in Australia, perform this step to meet the local standards.

6
No.
Cable
Type
Conductor
Cross-
Sectional Area
Outer Diameter
1
PE
cable[1]
Outdoor cable and M10 OT/DT
terminals
S
p≥ S/2
N/A
2
Tracking system
power cable
Three
-core outdoor copper cable
with dual
-layer protection
10 mm
2
15
–18 mm
3
AC output
power cable
(multi
-core)
•
If you connect a ground cable to
the ground point on the chassis
shell, you are advised to use a
three-
core (L1, L2, and L3) outdoor
cable and M12 OT/DT terminals
(L1, L2, and L3).
•
If you connect a ground cable to
the ground point in the
maintenance compartment, you do
not need to prepare a PE cable but
are advised to use a four-
core (L1,
L2, L3, and PE) outdoor cable, M12
OT/DT terminals (L1, L2, and L3),
and M10 OT/DT terminals (PE).
•
Copper cable
−S: 70–240 mm2
−Sp≥ S/2
•
Aluminum alloy
cable or copper-
clad aluminum
cable:
−S: 95–240 mm2
−Sp≥ S/2
24
–66 mm
AC output
power cable
(single
-core)[2]
You are advised to use a single
-core
outdoor cable and M12 OT/DT
terminals.
•
Copper cable
−S: 70–240 mm2
•
Aluminum alloy
cable or copper-
clad aluminum
cable:
−S: 95–240 mm2
14
–32 mm
4
DC input power
cable
PV cable that meets the 1100 V
standard
4
–6 mm2
5.5
–9 mm
5
RS485
communications
cable
Outdoor shielded twisted pair
that
meets the local standard
0.25
–1 mm2
•
One or two
communications
cables: 4–11
mm
•
Three
communications
cables: 4–8 mm
Note
[1]: The value of Sp
is valid only if the conductors of the PE cable and AC power cable use the
same material. If the materials are different, ensure that the conductor of the PE cable with a
proper cross
-sectional area produces a conductance equivalent to that of the cable specified in the
table.
The specifications of the PE cable are subject to this table or calculated according to IEC
60364
-5-54.
Note
[2]: For some models, the outer diameter of a single-
core cable ranges from 14 mm to 36 mm
based on the label in the maintenance compartment.
Preparations
4.1
•S and Spare the conductor cross-sectional areas of AC power cables and PE cables respectively.
•The cable diameter must comply with local cable standards.
•The factors that affect cable selection include the rated current, cable type, routing mode,
ambient temperature, and maximum expected line loss.
3-pin Model (125KTL) Cable Description
4Connecting Cables
•Connect cables in accordance with the local installation laws and regulations.
•To prevent poor cable connection due to overstress, leave enough slack before connecting the
cables to the appropriate ports.

7
4-pin Model (75KTL/100KTL/110KTL) Cable Description
No.
Cable
Type
Conductor
Cross
-
Sectional Area
Outer Diameter
1
PE
cable[1]
Outdoor cable and M10 OT/DT
terminal
s
S
p≥ S/2
N/A
2
Tracking system
power cable
Three
-
core outdoor copper cable with
dual
-layer protection
10 mm
2
15
–18 mm
3
AC output
power cable
(multi
-core)
•If you connect a ground cable to the
ground point on the chassis shell
and the neutral wire is not used, you
are advised to use a three-
core (L1,
L2, and L3) outdoor cable and M12
OT/DT terminals (L1, L2, and L3).
•If you connect a ground cable to the
ground point in the maintenance
compartment and the neutral wire
is not used, you are advised to use a
four-core (L1, L2, L3, and PE)
outdoor cable, M12 OT/DT
terminals (L1, L2, and L3), and M10
OT/DT terminals (PE).
•If you connect a ground cable to the
ground point on the chassis shell
and the neutral wire is used, you are
advised to use a four-core (L1, L2,
L3, and N) outdoor cable and M12
OT/DT terminals (L1, L2, L3, and N).
•If you connect a ground cable to the
ground point in the maintenance
compartment and the neutral wire
is used, you are advised to use a
five-core (L1, L2, L3, N, and PE)
outdoor cable, M12 OT/DT
terminals (L1, L2, L3, and N), and
M10 OT/DT terminals (PE).
•
Copper cable
−S: 70–240
mm2
−Sp≥ S/2
•Aluminum alloy
cable or copper
-
clad aluminum
cable:
−S: 95–240
mm2
−Sp≥ S/2
24
–66 mm
AC output
power cable
(single
-core)
You are advised to use a single
-core
outdoor cable and M12 OT/DT
terminals.
•
Copper cable
−S: 70–240
mm2
•Aluminum alloy
cable or copper
-
clad aluminum
cable:
−S: 95–240
mm2
14
–32 mm
4
DC input power
cable
PV cable that meets the 1100 V
standard
4
–6 mm2
5.5
–9 mm
5
RS485
communications
cable
Outdoor shielded twisted pair
that
meets the local standard
0.25
–1 mm2
•
One or two
communications
cables: 4–
11 mm
•
Three
communications
cables: 4–8 mm
Note
[1]: The value of Sp
is valid only if the conductors of the PE cable and AC power cable use the
same material. If the materials are different, ensure that the conductor of the PE cable with a
proper cross
-sectional area produces a conductance equivalent to that of the cable specified in the
table.
The specifications of the PE cable are subject to this table or calculated according to IEC
60364
-5-54.

8
Installing a PE Cable
4.2
•It is recommended that the
PE cable of the solar inverter
be connected to a nearby
ground point. Connect the PE
points of all solar inverters in
the same array to ensure
equipotential connections to
PE cables.
•To enhance the corrosion
resistance of a ground
terminal, you are advised to
apply silica gel or paint on it
after connecting the PE cable.
Opening the Maintenance Compartment Door
4.3
•Do not open the panel of the solar inverter.
•Before opening the maintenance compartment door, turn off the downstream AC output
switch and three DC switches at the bottom.
•Do not open the maintenance compartment door in rainy or snowy days. If you have to, take
protective measures to prevent rain or snow from entering the maintenance compartment.
•Do not leave unused screws in the maintenance compartment.
1. Loosen the screws on the
maintenance compartment door.
2. Open the maintenance compartment door and
adjust the support bar.
Reserved PE point

9
4. Select a crimping module according to the type of the AC output power cable.
3. Remove the accessories and set them aside.
3-pin Model 4-pin Model
Multi-core Cable
Single-core Cable

10
(Optional) Installing the Tracking System Power Cable
4.5
•The tracking system should be equipped with an overcurrent protective device or component.
The length of the cable between the power cable terminal and the overcurrent protection
device or component must be less than or equal to 2.5 m.
•The power supply of the tracking system should be an AC three-phase power grid.
•Keep inflammable materials away from the power cable.
•The power cable must be protected with a conduit to prevent short circuits caused by
insulation layer damage.
Removing the Rubber Rings from the Crimping Module
4.4
Use scissors to cut off the joints of the rubber rings to remove them. All rubber rings are
removed in the same way.
Remove the corresponding rubber rings strictly according to the cable diameter range, and
ensure that the crimping module is not damaged. Otherwise, the protection level of the solar
inverter will be affected.

11
Multi-core Connection Method
Installing the AC Output Power Cable
4.6
•This section describes how to install an AC output power cable for the 3-pin model.
•The cable outer diameter can be measured using the ruler sticker in the maintenance
compartment.
•Ensure that the AC output power cable is secured. Failure to do so may cause the solar inverter
to malfunction or damage to its terminal block by issues such as overheating.
•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.
•If a screw on the maintenance compartment door is lost, obtain the spare screw from the
fitting bag tied at the bottom of the maintenance compartment.

12
Single-core Connection Method
Four-core cable Three-core cable Single-core cable
3-pin Model (125KTL) Cable Connections
The 32–36 mm cable is supported only by some models. Refer to the corresponding label to get
the supported size.

13
4-pin Model (75KTL/100KTL/110KTL) Cable Connections
Three-core cable
Four-core cable
(including PE)
Four-core cable
(including N)
Five-core cable
Single-core cable
(including N)
Single-core cable
(excluding N)
Closing the Maintenance Compartment Door

14
Ensure that the PV module output is well insulated to ground.
Installing DC Input Power Cables
4.7
When the DC inputs are not fully configured, the DC input terminals must meet the following
requirements:
1. Evenly distribute the DC input power cables on the DC input terminals controlled by the three
DC switches. DC SWITCH 1 is preferred.
2. Maximize the number of connected MPPT circuits.
Selecting DC Input Terminals
1. Use the positive and negative Amphenol Helios H4 metal contacts and DC connectors
supplied with the solar inverter. Using incompatible positive and negative metal contacts and
DC connectors may result in serious consequences. The caused device damage is not covered
under any warranty.
2. Before connecting the DC input power cables, label the cable polarities to ensure correct
cable connections. Otherwise, the solar inverter may be damaged.
3. Measure the voltage at the DC input end using a multimeter set to the DC position. If the
voltage is a negative value, the DC input polarity is incorrect. Correct the polarity. If the
voltage is greater than 1100 V, too many PV modules are configured to the same string.
Remove some PV modules.
4. If the DC input power cable is reversely connected and the DC switches are set to ON, do not
perform any operation on the switches or the positive and negative connectors. Otherwise,
the device may be damaged. The caused device damage is not covered under any warranty.
Wait until the solar irradiance weakens at night and the PV string current decreases below 0.5
A. Set the three DC switches to OFF, and correct the connection of positive and negative
connectors.
5. Connect the PV string connector to the inverter connector, and then pull back the PV string
connector along the axial direction to check whether the connectors are securely connected.
6. The connector must be securely connected. Damages caused by improper connection are not
covered under the warranty.
Installing a DC Input Power Cable

15
Connector connection:
Positive metal contact
Negative metal contact Ensure that the cable
cannot be pulled out
after being crimped.
Positive connector
Negative
connector Click
Click
Use a multimeter set
to the DC position to
measure the DC
voltage. (DC voltage:
≤ 1100 V)
Ensure that the
locking nut is
secured.
H4TC0003 (Amphenol)
H4TW0001
(Amphenol)

16
Connecting RS485 Communications Cables (4–8 mm Four-hole Rubber Plug)
Number of
communications cables
Port
Pin
Definition
Pin
Definition
Description
RS485
-1
1
RS485A IN, RS485
differential signal+
2
RS485A OUT, RS485
differential signal+
Used for cascading
solar inverters or
connecting to devices
such as the
SmartLogger
.
3
RS485B IN, RS485
differential signal
–
4
RS485B OUT, RS485
differential signal
–
Protection
ground
5
PE, shielding ground
6
PE, shielding ground
N/A
RS485
-2
7
RS485A, RS485
differential signal+
8
RS485B, RS485
differential signal
–
Used for connecting to
RS485 slave devices.
Installing the RS485 Communications Cable
4.8
•The solar inverter supports RS485
communication and MBUS communication. If
the MBUS communication mode is used, you
do not need to connect the communications
cable to the RS485-1 port.
•This section describes how to connect three
communications cables.
•When routing communications cables,
separate communications cables from power
cables to prevent communication from being
affected.
Pin Definitions of Communications Ports

17
5Verifying the Installation
No.
Acceptance Criteria
1
The solar inverter is installed correctly and securely.
2
The DC switches and downstream AC switch are set to OFF.
3
All cables are connected correctly and securely.
4
The installation space is proper, and the installation environment is clean and tidy.
5
The maintenance compartment door is closed
and secured.
6
Unused DC input terminals are sealed.
7
Unused USB ports are plugged with watertight caps.
One or two
communications cables
Three communications
cables
One communications cable
Connecting RS485 Communications Cables (4–8 mm Two-hole or Three-hole Rubber Plug)

18
1. Turn on the AC switch between the solar inverter and the power grid.
2. (Optional) Remove the screws that secure DC SWITCH 1, DC SWITCH 2, and DC SWITCH 3,
and keep the screws properly for the power-off maintenance later.
3. Set DC SWITCH 1 (MAIN SWITCH) at the bottom of the solar inverter chassis to ON. When
you hear a click sound, the switch is ON.
4. Check the status of the PV connection indicator. If it is steady green, set DC SWITCH 2 and
DC SWITCH 3 to ON.
5. Observe the LED indicators to check the operating status of the solar inverter.
•Before turning on the AC switch between the solar inverter and the power grid, check that
the AC voltage is within the specified range using a multimeter set to the AC position.
•Do not turn the DC switch to the unloaded position .
6Powering On the System
When LED2 is steady green (meaning that the inverter is grid-tied), do not turn on any DC
switch. Otherwise, the inverter may be damaged because the insulation resistance is not
detected.

19
Indicator
Status (Blinking Fast: On for
0.2s
and then Off for 0.2s;
Blinking Slowly: On for 1s and
then Off for 1s)
Description
PV
connection
indicator
Steady green
At least one PV string is properly connected,
and the DC input voltage of the corresponding
MPPT circuit is at least 200 V.
Blinking green fast
If the alarm/maintenance indicator is red, an
environmental fault at the DC side of the solar
inverter is generated.
Off
The solar inverter disconnects from all PV
strings, or the DC input voltage of all MPPT
circuits is less than 200 V.
Grid
connection
indicator
Steady green
The solar inverter is in grid
-tied mode.
Blinking green fast
If the alarm/maintenance indicator is red, an
environmental
fault at
the AC side of the solar
inverter is generated.
Off
The solar inverter is not in
grid-tied.
Communications
indicator
Blinking green fast
The solar inverter receives communication data
normally.
Off
The solar inverter has not received
communication data for 10 seconds.
Alarm/
Maintenance
indicator
Alarm status
Steady red
A major alarm is
generated.
•
If the PV connection indicator or grid
connection indicator is blinking green fast,
troubleshoot DC or AC environmental faults
as instructed by the SUN2000 app.
•
If the PV connection indicator and grid
connection indicator are both not blinking
green fast, replace components or the solar
inverter as instructed by the SUN2000 app.
Blinking red fast
A minor alarm is generated.
Blinking red slowly
A warning alarm is generated.
Local
maintenance
status
Steady green
Local maintenance succeeds.
Blinking green fast
Local maintenance fails.
Blinking green
slowly
In local maintenance or shuts down over a
command.