Huawei SUN2000-125KTL-JPH0 User manual

HUAWEI TECHNOLOGIES CO., LTD.
SUN2000-125KTL-JPH0
Quick Guide
Issue: 08
Part Number: 31500ECT
Date: 2021-09-30

1Copyright © Huawei Technologies Co., Ltd.
2021. 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. Operators
should understand the composition and working principles of the grid-tied PV power system
and local standards.
•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).
1Product Overview
Front View
(1) PV connection indicator
(2) Grid connection
indicator
(3) Communication
indicator
(4) Alarm/Maintenance
indicator
(5) Host panel cover
(6) Maintenance compartment
Port Illustration (Manual DC Switch)
The DC switch of the current model can be manual or automatic.

2
(1
) Spot-check terminal connection box
(2
) DC input terminals (controlled by DC SWITCH 1)
(3
) DC switch 1 (DC SWITCH 1)
(4
) DC input terminals (controlled by DC SWITCH 2)
(5
) DC switch 2 (DC SWITCH 2)
(6
) DC input terminals (controlled by DC SWITCH 3)
(7
) DC switch 3 (DC SWITCH 3)
(8
) Ventilation valve
(9
) USB port (USB)
(10
) Communications port (COM)
(11
)
Hole for the AC output power cable
(12) Hole for the tracking system power cable
Port Illustration (Automatic DC Switch)
The DC switch can be automatically disconnected when an internal fault is detected in an inverter.
(1) Spot
-check terminal connection box
(2) DC input terminals (controlled by DC SWITCH 1)
(3) DC switch 1
[1] (DC SWITCH 1)
(4) Reset button 1
(RESET 1)
(5) DC input terminals (controlled by DC
SWITCH 2)
(6) DC switch 2
[1] (DC SWITCH 2)
(7) Reset button 2
(RESET 2)
(8) DC input terminals (controlled by DC SWITCH 3)
(9) DC switch 3
[1] (DC SWITCH 3)
(10) Reset button 3
(RESET 3)
(11) Ventilation valve
(12) USB port (USB)
(13) Communications port (COM)
(14) Hole for the AC output power cable
(15) Hole for the tracking system power
cable
Note [1]: If the DC switch rotating handle is at the position , the DC switch is not
completely closed and may not be automatically switched off.

3
Installation Angle
2.1
2Installation Requirements
SUN2000 Dimensions
Mounting Bracket Dimensions

4
3Installing the SUN2000
Installation Space
2.2
For ease of installing the SUN2000
on the mounting bracket,
connecting cables to the bottom of
the SUN2000, and maintaining the
SUN2000 in future, it is
recommended that the bottom
clearance be between 600 mm and
730 mm.
1. Install the mounting bracket.
•The M12x40 bolt assemblies are
delivered with the SUN2000. 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 from
the mounting bracket and save it for
later use.
•This document introduces how to install
the SUN2000 on a support as an
example. For details about wall-
mounted installation, see the user
manual.

5
2. Unpack the inverter and move it to the specified position.
Handles are packed in a fitting bag and are not delivered with the SUN2000.
3. Adjust the installation positions of the handles, and install the SUN2000 on the mounting
bracket.

6
If outdoor copper-core cables are used, select copper wiring terminals. For details about the
requirements for cables and terminals of other materials, see the user manual.
4Installing Cables
Installation Preparations
4.1
No.
Item
Type
Specifications
Description
1
PE cable
Single
-core
outdoor copper
cable
Conductor cross
-
sectional area ≥
S/2[1]
(S
is the conductor cross
-
sectional area of the AC
output power cable
.)
•
If you choose the
ground point on the
chassis shell for
connecting a PE
cable, prepare the PE
cable.
•
If you choose the
ground point in the
maintenance
compartment for
connecting a PE
cable, use a four-
core
AC output power
cable and do not
have to prepare a PE
cable.
2
AC output
power
cable
[2][3]
Outdoor copper
cable
•
Conductor cross-
sectional area: 50–
240 mm2
•Cable outer diameter:
24–66 mm (multi-
core); 14–32 mm
(single-core)
If you choose the ground
point in the maintenance
compartment for
connecting a PE cable,
use a four
-core cable.
Otherwise, use a three
-
core cable or three
single
-core cables.
Outdoor
aluminum
-core
cable
•
Conductor cross-
sectional area: 70–
240 mm2(multi-
core); 70–240 mm2
(single-core)
•Cable outer diameter:
24–66 mm (multi-
core); 14–32 mm
(single-core)
3
DC input
power cable
PV cable that
meets the 1500 V
standard
•
Conductor cross-
sectional area: 4–6
mm2
•Cable outer diameter:
4.7–6.4 mm
-

7
No.
Item
Type
Specifications
Description
4
RS485
communication
s cable
Outdoor shielded
twisted pair cable
•
Conductor cross-
sectional area: 0.25–
1
mm2
•Cable outer diameter:
4–11 mm
When three
communications cables
connect to the signal
cable connector, the
outer diameter of the
cables should be 4
–8
mm.
5
(Optional)
Power cable of
the tracking
system
Three
-
core outdoor
copper cable with
dual
-layer
protection
•
Conductor cross-
sectional area: 10
mm2
•Cable outer diameter:
15–18 mm
-
Note [1]: The value 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 cross
-
sectional area of the
PE cable produces a conductance equivalent to that of the area S/2. The specifications of the PE
cable are subject to this table or calculated according to IEC 60364
-5-54.
Note [2]: You are advised to use a soft cable to prevent poor terminal contact due to the bending
stress of the cable
.
Note [3]:
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.
Installing the PE Cable
4.2
•It is recommended that the PE cable
be connected to a nearby PE point.
Connect the PE points of all
SUN2000s in the same PV 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.

8
1. Loosen the screws on the maintenance
compartment door.
2. Open the maintenance compartment door
and adjust the support bar.
Opening the Maintenance Compartment Door
4.3
•Do not open the host panel of the SUN2000.
•Before opening the SUN2000 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 must, take
protective measures to prevent rain or snow from entering the maintenance compartment.
•Do not leave unused screws in the maintenance compartment.

9
(Optional) Replacing the Crimping Module
4.4
If the AC output power cable has a single core, replace the crimping module.
Crimping
module
3. Remove the crimping modules that are bound in the maintenance compartment and save
them properly for future use.
A three-hole rubber plug is bound in the maintenance compartment. After removing the rubber
plug, save it properly for future use.

10
(Optional) Installing the Solar Tracker Power Cable
4.6
1. A switch-disconnector-fuse or fuse-switch-disconnector with a voltage of no less than 800 V,
current of 16 A, and protection type of gM needs to be installed between the SUN2000 and
the tracker controller for protection.
2. The cable between the wiring terminal on the power cable and the switch-disconnector-fuse
or fuse-switch-disconnector should be less than or equal to 2.5 meters.
Removing the Rubber Rings from the Crimping Module
4.5
Use scissors to cut off the joints of the rubber rings to remove them. All rubber rings are
removed in the same way.

11
Multi-Core Cable (Four-Core Cable Is Used as an Example)
Installing AC Output Power Cables
4.7
(five rings)
(four rings)
(three rings)
(two rings)
(one ring)
(six rings)
•Remove the corresponding rubber rings in strict accordance with the cable diameter, and ensure
that the crimping module is not damaged. Otherwise the protection level of the solar inverter
will be affected.
•Ensure that AC terminations provide firm and solid electrical connections. Failing to do so may
cause SUN2000 malfunction and damage to its terminal block, even starting thermal events.
•If the AC output power cables are subject to a pulling force because the inverter is not installed
stably, ensure that the last cable that bears the stress is the PE cable.

12
Single-Core Cable
(three rings)
(two rings)
(one ring)
(four rings)
The 32–36 mm cable is supported only
by some models. Refer to the
corresponding label to get the
supported size.
(five rings)

13
Closing the Maintenance Compartment Door
4.8
Installing DC Input Power Cables
4.9
Wiring Description of Y-branch Connectors
•Y-branch connectors can be purchased from Huawei or the manufacturers based on the
following recommended models: If the rated current of the fuse of the Y-branch connector is
15 A, the recommended model is 904095944 (Luxshare) or A040959443039 (Comlink); if
the rated current of the fuse of the Y-branch connector is 20 A, the recommended model is
904095945 (Luxshare) or A040959453039 (Comlink).
•When connecting cables to recommended Y-branch connectors, ensure that the connectors
to be paired match each other and are from the same manufacturer. Otherwise, the contact
resistance of the connectors may exceed the allowed value. In this case, the connectors may
be heated and oxidized, which may cause faults.
•Ensure that the locking nuts of all connectors are tightened.
•Do not bind more than three fuse enclosures together. Otherwise, the fuses and their
enclosures may be damaged due to overheating. It is recommended that a clearance of 10
mm or more be reserved between fuse enclosures. You are advised not to bind the fuse
enclosures with other heat emitting conductors.
Wiring rules:
1. The PV+ on the string side must be connected to the PV+ on the SUN2000 side, and the PV–
on the string side must be connected to the PV–on the SUN2000 side.
2. Preferentially and evenly connect the Y-branch connectors to the MPPTs controlled by DC
SWITCH 1 or DC SWITCH 2.

14
Number
of Y
-
branch
Connector
Sets
Recommended MPPT to Be
Connected
Number of
Y
-branch
Connector
Sets
Recommended MPPT to Be
Connected
1
MPPT1
2
MPPT1 and MPPT4
3
MPPT1, MPPT3 and MPPT4
4
MPPT1, MPPT3, MPPT4 and
MPPT6
5
MPPT1, MPPT2, MPPT3, MPPT4,
and MPPT5
6
MPPT1, MPPT2, MPPT3, MPPT4,
MPPT5, and MPPT6
7
MPPT1, MPPT2, MPPT3, MPPT4,
MPPT5, MPPT6, and MPPT7
8
MPPT1, MPPT2, MPPT3, MPPT4,
MPPT5, MPPT6, MPPT7, and
MPPT8
9
MPPT1, MPPT2, MPPT3, MPPT4,
MPPT5, MPPT6, MPPT7, MPPT8,
and MPPT9
N/A
N/A
Y-branch Connector Solution

15
Scenario
Model of Y
-branch
Connector (Part A)
Connection Description
Connecting Y
-branch
connectors to the PV
strings (recommended)
All models
Use the DC terminals delivered with the
SUN2000s
to connect part B to the SUN2000s.
Connecting Y
-branch
connectors to the
SUN2000
Models recommended
by Huawei
Part A can be directly connected to the
SUN2000
, and part B is not needed.
Other models
To ensure that the terminals of part A
match
the DC terminals of the
SUN2000, part B is
needed to connect part A to the
SUN2000
. Use
the DC terminals delivered with the
SUN2000
to connect part B to the
SUN2000.
•It is recommended that the Y-branch connectors be connected from the PV string side and
tied to the PV trackers.
•The DC input terminals of the solar inverter are prone to damage under stress. When Y-
branch connectors are connected to the solar inverter, bind and secure the connectors to
minimize stress on the DC input terminals.
•Do not place the Y-branch connector harness on the ground. A safe distance must be
reserved between the Y-branch connector harness and the ground to avoid impact caused by
water on the ground to the harness.
Recommended tying solution:

16
Ensure that the PV module output is well insulated to ground.
The SUN2000 has three DC switches (DC SWITCH 1, DC SWITCH 2, and DC SWITCH 3). DC
SWITCH 1 controls routes 1–6 of DC input terminals, DC SWITCH 2 routes 7–12, and DC SWITCH
3 routes 13–18.
Select DC input terminals according to the following rules:
1. Evenly distribute the DC input power cables to 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 MC4 EVO2 PV connectors delivered with the SUN2000. If the PV connectors are lost or
damaged, purchase the connectors of the same model. The device damage caused by
incompatible PV connectors is beyond the warranty scope.
2. Before connecting DC input power cables, label the cable polarities to ensure correct cable
connections. If the cables are connected incorrectly, the SUN2000 may be damaged.
3. Measure the voltage at the DC input end using a multimeter. If the voltage is a negative value,
the DC input polarity is incorrect. Correct the polarity. If the voltage is greater than 1500 V, too
many PV modules are configured to the same string. Remove some PV modules.
4. If polarity of the DC input power cable is reversed and the DC switch is ON, do not turn off the
DC switch immediately or unplug positive and negative connectors. The device may be
damaged if you do not follow the instruction. The caused equipment damage is beyond the
warranty scope. Wait until the solar irradiance declines and the PV string current reduces to
below 0.5 A, and then turn off the three DC switches and remove the positive and negative
connectors. Correct the string polarity before reconnecting the string to the SUN2000.
5. For models of the crimping tool and removal wrench, use the recommended model or contact
your Staubli dealer.
6. 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.
7. The connector must be securely connected. Damages caused by improper connection are not
covered under the warranty.

17
Installing a DC Input Power Cable
13001462
(STAUBLI)
Click
PV-CZM-41100
(STAUBLI)
Positive metal contact
Negative metal contact
Use a multimeter
to measure the
DC voltage. (DC
voltage: ≤ 1500 V)
Ensure that the cable
cannot be removed
after crimped.
Click
Positive connector
Negative
connector
Ensure that
the locking
nut is
secured.
Connector connection:
Installing the RS485 Communications Cable
4.10
When routing communications cables, separate
communications cables from power cables to prevent
communication from being affected.

18
Connecting Communications Cables (4–8 mm Four-Hole Rubber Plug)
When using the four-hole rubber plug, block the unused cable hole with a plug, and then tighten
the locking cap.
Port
Pin
Definition
Pin
Definition
Description
RS485
-1
1
RS485A IN,
RS485
differential signal+
2
RS485A OUT,
RS485
differential signal+
Used for cascading
inverters or connecting to
devices such as the
SmartLogger.
3
RS485B, RS485
differential signal
–
4
RS485B, RS485
differential signal
–
PE
5
PE, shielding ground
6
PE, shielding ground
-
RS485
-2
7
RS485A, RS485
differential signal+
8
RS485B, RS485
differential signal
–
Used for connecting to
RS485 slave devices.

19
5Verifying the Installation
1.
The SUN2000 is installed correctly and securely.
2.
The DC switches and downstream AC switch are OFF.
3.
All ground cables are connected securely, without open circuits or short circuits.
4.
AC output power cables are connected correctly and securely, without open circuits or short
circuits.
5.
DC input power cables are connected correctly and securely, without open circuits or short
circuits.
6.
The RS485 communications cable is connected correctly and securely.
7.
The maintenance compartment door is closed and the door screws are tightened.
8.
Unused DC input terminals are sealed.
9.
Unused USB ports are plugged with watertight caps.
Connecting Communications Cables (4–8 mm Two-Hole Rubber Plug)
If three communications cables are to be connected, use the three-hole rubber plug that is bound
in the maintenance compartment.