Huawei SUN3KTL-L1 - User Manual

Questions and Answers:

S
sean90Sep 9, 2025
What to do for Abnormal PV Module Configuration on Huawei SUN3KTL-L1?
- J
  James PetersenSep 9, 2025
  If your Huawei Inverter displays an Abnormal PV Module Configuration error, it indicates that the PV module configuration doesn't meet requirements, the PV module output is reversely connected, or there's a short circuit. Check if the total number of PV modules, the number of PV modules in a string, and the number of PV strings meet the specified requirements. Also, check if the PV module output is reversely connected.
S
Stacey LopezSep 7, 2025
What causes Output DC Component Overhigh on a Huawei SUN3KTL-L1 Inverter?
- R
  rebecca06Sep 7, 2025
  Output DC Component Overhigh on a Huawei Inverter means the DC component of the SUN2000's output current exceeds the specified upper threshold. The SUN2000 detects its external working conditions in real time and should automatically recover once the issue is resolved. If the alarm occurs frequently, contact your dealer or Huawei technical support.
S
scott40Aug 22, 2025
What to do if Huawei SUN3KTL-L1 Inverter shows Grid Failure?
- L
  Lisa SullivanAug 22, 2025
  If your Huawei Inverter displays a Grid Failure message, it indicates a power grid outage, a disconnected AC circuit, or a tripped AC circuit breaker. First, check the AC voltage. Then, verify that the AC circuit is properly connected and the AC circuit breaker is in the ON position.
D
douglas75Sep 5, 2025
What does Abnormal Residual Current mean on Huawei Inverter?
- C
  Charles WilliamsSep 5, 2025
  An Abnormal Residual Current warning on your Huawei Inverter means the insulation impedance on the input side to PE is decreasing during operation. If the alarm occurs occasionally, the external circuit may be temporarily abnormal, and the SUN2000 will automatically recover. If the alarm occurs frequently or persists, check whether the impedance between the PV string and the ground is too low.
K
kevin04Sep 4, 2025
What does Unstable Grid Frequency mean on Huawei SUN3KTL-L1?
- C
  Clinton SheltonSep 4, 2025
  Unstable Grid Frequency on a Huawei Inverter indicates a power grid exception where the grid frequency change rate doesn't comply with the local power grid standard. If the alarm occurs occasionally, the power grid may be temporarily abnormal, and the SUN2000 should recover automatically. If it occurs frequently, check whether the power grid frequency is within the allowed range and contact the local power operator if it is not.
D
Devon CastilloSep 2, 2025
Why does my Huawei Inverter show Grid Underfrequency?
- W
  William CabreraSep 3, 2025
  A Grid Underfrequency error on your Huawei Inverter indicates a power grid issue where the actual grid frequency is lower than the standard requirement for the local power grid. If the alarm occurs occasionally, the power grid may be temporarily abnormal; the SUN2000 will automatically recover. If the alarm occurs frequently, check whether the power grid frequency is within the allowed range. If it is not, contact the local power operator. If it is, modify the grid underfrequency protection threshold through the mobile app, SmartLogger, or NMS with the consent of the local power operator.
R
rodriguezdonnaSep 1, 2025
What causes Grid Overfrequency on a Huawei Inverter?
- I
  Ian WalterSep 1, 2025
  Grid overfrequency on a Huawei Inverter is due to a power grid exception where the actual grid frequency is higher than the standard requirement for the local power grid. If the alarm occurs occasionally, the power grid may be temporarily abnormal, and the SUN2000 will automatically recover when the grid returns to normal. If the alarm occurs frequently, check whether the power grid frequency is within the allowed range. If it is not, contact the local power operator. If it is within range, modify the grid overfrequency protection threshold through the mobile app, SmartLogger, or NMS with the consent of the local power operator.
A
Aaron HickmanAug 31, 2025
Why is my Huawei Inverter overheating?
- M
  Michael AdamsAug 31, 2025
  If your Huawei Inverter is overheating, it could be due to poor ventilation at the installation site, an ambient temperature exceeding the upper threshold, or a general malfunction. Check the ventilation and ambient temperature where the SUN2000 is installed. If ventilation is poor or the ambient temperature is too high, improve ventilation and heat dissipation.
R
Rebekah LinAug 30, 2025
How to correct a reversed string on a Huawei SUN3KTL-L1 Inverter?
- R
  Regina MillerAug 30, 2025
  If your Huawei Inverter indicates a reversed string, it means the PV string is connected with reverse polarity. Check if the PV string is reversely connected to the SUN2000. If it is, wait for the PV string current to drop below 0.5 A, then set the DC switch to OFF, and adjust the PV string polarity.
J
jeremy33Aug 28, 2025
What to do if Huawei SUN3KTL-L1 Inverter shows DC Arc Fault?
- T
  Teresa TuckerAug 29, 2025
  A DC Arc Fault on your Huawei Inverter indicates that the PV string power cables are arcing or have poor contact. Check whether the string cables arc or are in poor contact.

Huawei SUN3KTL-L1 Specifications

General

MPPT Voltage Range	200V-800V
Operating Temperature Range	-25°C to 60°C
Weight	18kg
Protection Degree	IP65
Rated Power	3000 W
Cooling Method	Natural Convection
Protection Level	IP65
Rated AC Output Power	3 kW
Max. AC Output Power	3300W
Rated Output Voltage	230V
Output Voltage	230V
Output Frequency	50/60Hz

Summary

About This Document

Purpose of Document

Document describes SUN2000 installation, electrical connection, commissioning, maintenance, and troubleshooting.

Intended Audience

Document is applicable to Installers and Users.

Symbol Conventions

Defines symbols used in the document for hazards and notices.

Safety Information

General Safety Precautions

Before installing, operating, and maintaining, read this document and observe all safety instructions.

Personnel Requirements

Outlines qualifications and training needed for personnel installing or maintaining equipment.

Electrical Safety

Covers grounding requirements, general electrical safety, and AC/DC power precautions.

Mechanical Safety Guidelines

Details safety precautions for using ladders and handling heavy objects.

Commissioning Safety

Ensures professional personnel set parameters correctly for initial power-on.

Maintenance and Replacement Safety

Safety precautions for maintaining and replacing equipment, including powering off.

Product Introduction

Product Overview

Introduces the SUN2000 as a single-phase grid-tied string inverter and lists product models.

Component Description

Details the appearance and components of the SUN2000 unit.

Label Description

Explains the meaning of various enclosure labels and warnings.

Working Principles

Explains the schematic diagram and how the SUN2000 converts DC to AC power.

SUN2000 Storage

System Installation

Checking Before Installation

Guides on checking outer packing and deliverables before installation.

Preparing Tools and Instruments

Lists necessary tools and instruments for installation.

Installation Position Requirements

Covers basic requirements for choosing a suitable installation location.

Wall-Mounted Installation

Step-by-step guide for wall-mounting the SUN2000.

Support-Mounted Installation

Step-by-step guide for support-mounting the SUN2000.

Electrical Connection

Connection Precautions

Safety warnings before connecting cables, especially regarding the DC switch and certified electricians.

Preparing Cables

Details the components and cables required for electrical connections.

AC Output Power Cable Connection

Precautions and procedures for connecting the AC output power cable.

DC Input Power Cable Connection

Safety precautions and steps for connecting DC input power cables.

Battery Cable Connection

Prerequisites and procedures for connecting battery cables, with safety warnings.

Signal Cable Connection

Instructions and notices for connecting signal cables to the COM port.

System Commissioning

Verification Before Power-On

Checklist for verifying installation and connections before powering on the system.

System Power-On Procedure

Step-by-step procedure for safely powering on the SUN2000 system.

Man-Machine Interaction

App Commissioning

Guide to downloading and using the FusionSolar app for commissioning.

Parameters Settings

Overview of setting SUN2000 parameters via the app.

Energy Control

Details on energy control features like active power and reactive power control.

AFCI Functionality

Explains the AFCI function for arc fault detection and clearing alarms.

IPS Check Procedure

Procedure for performing the IPS test required by the Italy CEI0-21 grid code.

DRM Configuration

Information on the Demand Response Mode (DRM) for Australia AS4777.

System Maintenance

System Power-Off

Procedure for safely powering off the SUN2000 system.

Routine Maintenance

Checklist and intervals for performing routine maintenance on the SUN2000.

Troubleshooting Alarms

Lists common alarms, their severity, possible causes, and troubleshooting measures.

SUN2000 Disposal

Removing the SUN2000

Steps for safely removing the SUN2000 unit from its mounting.

Packing the SUN2000

Guidelines for packing the SUN2000 for storage or transport.

Disposing the SUN2000

How to dispose of the SUN2000 at the end of its service life.

Technical Parameters

SUN2000 Technical Specifications

Detailed technical specifications for various SUN2000 models.

Optimizer Technical Specifications

Technical specifications for the SUN2000-450W-P optimizer.

Grid Code

Device Commissioning

Resetting Password

Rapid Shutdown

Locating Insulation Resistance Faults

Acronyms and Abbreviations

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