Huawei SUN3KTL-L1 User Manual (English)

Questions and Answers:

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rodriguezdonnaSep 1, 2025
What causes Grid Overfrequency on a Huawei Inverter?
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  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.
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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.
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James WhiteAug 27, 2025
How do I troubleshoot Grid Overvoltage on a Huawei SUN3KTL-L1 Inverter?
- J
  Jonathan DeleonAug 27, 2025
  Grid overvoltage on a Huawei Inverter means the grid voltage is exceeding the higher threshold, or the high voltage duration has surpassed the HVRT (high voltage ride-through) value. If this happens occasionally, it could be a temporary power grid issue, and the SUN2000 should recover automatically. If it happens frequently, check if the power grid voltage is within the allowed range; if not, contact the local power operator. If the voltage is within range, you can modify the grid overvoltage protection threshold using the mobile app, SmartLogger, or NMS with the local power operator's consent. Also, check if the peak voltage of the power grid is too high. If the problem persists, contact the power operator.
J
Jessica RomeroAug 27, 2025
What causes Grid Undervoltage on a Huawei Inverter?
- R
  Rodney MasonAug 27, 2025
  Grid undervoltage on a Huawei Inverter happens when the grid voltage falls below the lower threshold or the low voltage duration exceeds the LVRT (low voltage ride-through) value. If this occurs occasionally, the power grid may be temporarily abnormal, and the SUN2000 will automatically recover. If it occurs frequently, verify that the power grid voltage is within the allowed range. If it is not, contact your local power operator. If the voltage is within range, adjust the grid undervoltage protection threshold using the mobile app, SmartLogger, or network management system (NMS), after getting approval from the local power operator. Also, check the connection between the AC switch and the output power cable if the problem persists.
T
tammyclarkAug 25, 2025
Why is the string input voltage high on my Huawei SUN3KTL-L1 Inverter?
- S
  Sherry BullockAug 26, 2025
  A high string input voltage on your Huawei Inverter means the PV array isn't configured correctly. Too many PV modules are serially connected, causing the open-circuit voltage to exceed the SUN2000's maximum operating voltage. Check the serial connection configuration of the PV string to ensure the open-circuit voltage doesn't exceed the SUN2000's maximum. Correcting the PV array configuration should resolve the alarm.
M
Mike VazquezAug 25, 2025
How to fix low insulation resistance on Huawei SUN3KTL-L1 Inverter?
- N
  nicoleperezAug 25, 2025
  A low insulation resistance error on your Huawei Inverter indicates a potential short circuit between the PV array and the ground, or damp ambient air causing poor insulation. Check the output impedance of the PV array to ground for shorts or insulation issues and rectify them. Also, ensure the PE cable of the SUN2000 is correctly connected. If the impedance is lower than the specified protection threshold in rainy or cloudy conditions, adjust the insulation resistance protection settings using the mobile app, SmartLogger, or NMS.

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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