Huawei SUN2000 M5 Series - User Manual

Huawei SUN2000 M5 Series

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SUN2000-(12KTL-25KTL)-M5 Series

User Manual

Issue 03

Date 2023-02-15

HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Table of Contents

Other manuals for Huawei SUN2000 M5 Series

Quick Guide9 pages

Questions and Answers:

M
Matthew YoungSep 1, 2025
What causes Grid voltage imbalance on Huawei SUN2000 M5?
- A
  Autumn LeonardSep 1, 2025
  If your Huawei Inverter displays a 'Grid voltage imbalance' alarm, it means the difference between the power grid phase voltages is too high. Here's what to do: 1. If the alarm occurs occasionally, it may be due to a temporary grid issue, and the inverter should recover automatically. 2. If the alarm persists, check if the power grid voltage is within the acceptable range. If not, contact the local power operator. 3. If the alarm persists long-term, check the AC output power cable connection. 4. If the cable is correctly connected but the alarm continues, and it's affecting your PV plant's energy yield, contact the local power operator.
J
Jessica LeeAug 31, 2025
How to fix High string input voltage on Huawei SUN2000 M5?
- B
  Brian MannAug 31, 2025
  If your Huawei Inverter displays 'High string input voltage', it means the PV array is not configured correctly. Too many PV modules are connected in series, causing the PV string open-circuit voltage to exceed the inverter's maximum operating voltage. Reduce the number of PV modules connected in series until the PV string open-circuit voltage is within the limit. The alarm should then disappear.
C
collinswilliamAug 30, 2025
How to resolve String Reverse Connection on Huawei SUN2000 M5?
- V
  Victor MorrisAug 30, 2025
  If your Huawei Inverter is showing a 'String Reverse Connection' error, it means the polarity of the PV string is reversed. To fix this, wait until night when solar irradiance is low and the PV string current drops below 0.5 A. Then, turn off the DC switch and correct the PV string connection.
E
Erika BurtonAug 29, 2025
How to fix Low Insulation Resistance error on Huawei SUN2000 M5?
- T
  Teresa CooperAug 29, 2025
  If you're seeing a 'Low Insulation Resistance' error on your Huawei Inverter, it means there's a short circuit between the PV array and PE, or the PV string has been exposed to moisture, reducing its insulation. Here's how to address it: 1. Check the resistance between the PV string and the PE cable for any shorts and fix them. 2. Ensure the inverter's PE cable is correctly connected. 3. If the low resistance is due to a cloudy or rainy environment, you can adjust the insulation resistance protection threshold via the app, SmartLogger, or NMS.
M
Monica CarterAug 28, 2025
What causes AC Overcurrent on a Huawei SUN2000 M5?
- M
  Michael FrankAug 28, 2025
  If your Huawei Inverter shows 'AC Overcurrent', it means the inverter's output current is too high, likely due to a drop in grid voltage or a short circuit. The inverter should automatically attempt to recover once the issue is resolved. If the alarm persists and affects power generation, check for any short circuits in the output. If you can't fix it, contact your dealer or Huawei technical support.
A
Anthony VillanuevaAug 27, 2025
Why does my Huawei Inverter show Grid Underfrequency?
- E
  Emma BenitezAug 27, 2025
  If your Huawei Inverter displays a 'Grid Underfrequency' alarm, it means that the power grid frequency is too low. Here's what to do: 1. If the alarm occurs occasionally, it might be a temporary issue with the power grid, and the inverter should recover automatically. 2. If the alarm persists, check whether the power grid frequency is within the acceptable range. If it is not, contact the local power operator. If it is, you may need to modify the grid underfrequency protection threshold using the app, SmartLogger, or NMS, but only with the consent of the local power operator.
E
Edward PenningtonAug 27, 2025
Why is my Huawei SUN2000 M5 displaying Grid Overfrequency?
- K
  Kyle ThompsonAug 27, 2025
  If your Huawei Inverter is showing a 'Grid Overfrequency' alarm, it indicates that the power grid frequency is too high. Here’s what to do: 1. If the alarm occurs occasionally, it may be due to a temporary grid abnormality. The inverter should recover automatically when the grid returns to normal. 2. If the alarm persists, check whether the power grid frequency is within the acceptable range. If not, contact the local power operator. If it is within range, consider modifying the grid overfrequency protection threshold through the app, SmartLogger, or NMS, but only with the consent of the local power operator.
C
christophervaldezAug 25, 2025
Why is my Huawei SUN2000 M5 Inverter showing Grid Undervoltage?
- M
  Marie StephensAug 26, 2025
  If your Huawei Inverter displays a 'Grid Undervoltage' error, it means the power grid voltage is too low. Here’s what to do: 1. If the alarm is occasional, it could be a temporary issue with the power grid, and the inverter should recover automatically. 2. If the alarm persists, verify that the power grid voltage is within the acceptable range. If not, contact your local power operator. If the voltage is within range, you might need to adjust the grid undervoltage protection threshold via the app, SmartLogger, or NMS, but only with the consent of the local power operator. 3. If the alarm continues for a long time, inspect the AC circuit breaker and the AC output power cable.
J
Joshua RichardsonAug 25, 2025
Why does my Huawei SUN2000 M5 Inverter display Grid Overvoltage?
- W
  whitejonathanAug 25, 2025
  If your Huawei Inverter is showing a 'Grid Overvoltage' alarm, it could be due to the power grid voltage exceeding acceptable limits. Here's what to do: 1. If the alarm is occasional, it might be a temporary grid issue; the inverter should recover automatically. 2. If the problem persists, check if the grid voltage is within the normal range. If it's not, contact your local power operator. If it is, you might need to adjust the grid overvoltage protection threshold using the app, SmartLogger, or NMS, but only with the power operator's consent. 3. If the alarm continues long-term, check the peak voltage of the grid and contact the power operator if needed.

Huawei SUN2000 M5 Series Specifications

General

Max Efficiency	98.6%
Max Input Voltage	1100 V
MPPT Operating Voltage Range	200 V - 1000 V
Operating Temperature Range	-25°C to +60°C
Communication	RS485, 4G (optional)

Summary

Safety Information

General Safety Statements and Precautions

Provides overarching safety guidelines and disclaimers for handling the equipment.

Personal Safety Guidelines

Details crucial safety measures to protect individuals during operation and maintenance.

Electrical Safety Precautions

Outlines essential safety practices related to electrical connections and operations.

Environment Requirements for Installation

Specifies the environmental conditions necessary for safe and proper inverter operation.

Mechanical Safety and Handling Procedures

Covers safe practices for moving, installing, and handling the inverter and its components.

Installation

Checking Before Installation

Installation Position Requirements

Installing the Inverter

Guides users through the step-by-step process of mounting and installing the inverter.

Electrical Connections

Electrical Connection Precautions

Highlights safety warnings and precautions before making electrical connections.

Preparing Cables for Connection

Connecting the Ground Cable

Installing DC Input Power Cables

Guides users on how to connect the DC input power cables correctly.

Installing AC Output and Signal Cables

Explains the procedures for connecting AC output and signal cables.

Commissioning

Check Before Power-On

Lists critical checks to perform before powering on the system for the first time.

Powering On the System

Details the step-by-step procedure for safely powering on the inverter system.

Man-Machine Interactions

App Commissioning Procedures

Parameter Settings and Control

Maintenance

Powering Off the System Safely

Provides the procedure for safely powering down the inverter before maintenance.

Routine Maintenance Schedule

Troubleshooting Common Issues

Lists common alarms, their possible causes, and troubleshooting steps.

Device Commissioning

Accessing the Commissioning Screen

Guides on how to access the device commissioning screen via the app.

Connecting to the Inverter for Commissioning

Resetting Password

Password Reset Procedure

Locating Insulation Resistance Faults

Fault Identification and Causes

Fault Location Procedure

Rapid Shutdown

Triggering Rapid Shutdown

NS Protection

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