Huawei SUN2000-50KTL-NHM3 User manual

HUAWEI TECHNOLOGIES CO., LTD.

SUN2000-50KTL-NHM3

Quick Guide

Issue: 02

Part Number: 31500HQX

Date: 2023-01-10

1Overview

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

) Screws for fixing the awning

) Hole for the DC switch locking screw

) DC switch (DC SWITCH)

) Smart Dongle port

) Communications port (COM)

) DC input terminals (PV1–PV8)

) Ventilation valves

(10

) AC output port

(11

) Spot-check terminal connection box

(12) Ground point

(13) Fan

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

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.

Preparations

4.1

4Connecting Cables

No.

Cable

Type

Specifications

PE cable

Single

-core outdoor copper-

core cable

Conductor cross

-sectional area ≥ 5.5 mm2

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

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

(Optional) RS485

communications

cable

Two

-core outdoor shielded

twisted

pair

•

Conductor cross-sectional area: 0.2–1

mm2

•

Cable outer diameter: 4–11 mm

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.

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.

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

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

PV1

PV1, PV7

PV1, PV3, PV7

PV1, PV3, PV5, PV7

PV1, PV2, PV3, PV5, PV7

PV1, PV2, PV3, PV5, PV7, PV8

PV1, PV2, PV3, PV4, PV5, PV7,

PV8

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.

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

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.

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.

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