Hoymiles HMT-1800-4T User Manual

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Open Energy for All

Three-phase Microinverter

HMT-1600-4T

HMT-1800-4T

HMT-2000-4T

USER MANUAL

Region: EMEA & APAC V202303

hoymiles.com

Table of Contents

Other manuals for Hoymiles HMT-1800-4T

Quick Installation Guide2 pages

Questions and Answers:

O
ovangAug 14, 2025
How to fix firmware error on Hoymiles Inverter?
- R
  Robert TaylorAug 14, 2025
  If you encounter a firmware error with your Hoymiles Inverter, first verify that the firmware is correct and attempt to upgrade it again. Next, check the communication between the DTU and the Hoymiles monitoring system, as well as the communication between the DTU and the microinverter. After checking the communication, try again. If the problem persists, contact your dealer or Hoymiles technical support.
C
Cynthia RamirezAug 17, 2025
What to do if Hoymiles HMT-1800-4T Inverter shows grid overvoltage?
- J
  Jessica ThorntonAug 17, 2025
  If a grid overvoltage alarm occurs occasionally on your Hoymiles inverter, it might be due to a temporary grid voltage abnormality; the microinverter should recover automatically once the voltage returns to normal. However, if the alarm appears frequently, verify that your grid voltage is within the acceptable range. If it's not, contact your local power operator or, with their consent, adjust the grid overvoltage protection limit using the Hoymiles monitoring system.
S
Suzanne OwensAug 21, 2025
What to do if Hoymiles HMT-1800-4T is offline?
- B
  Brian GarzaAug 21, 2025
  First, ensure that the Hoymiles microinverter is working correctly. Then, check the communication status between the DTU and the Hoymiles monitoring system, as well as between the DTU and the microinverter itself. If the communication is poor, try to improve it. If the alarm continues frequently and you can't resolve it, it may be necessary to contact your dealer or Hoymiles technical support.
W
William HardingAug 25, 2025
Why does my Hoymiles HMT-1800-4T Inverter have over temperature protection?
- M
  Megan MaloneAug 26, 2025
  If your Hoymiles Inverter is showing an over-temperature protection warning, first check the ventilation and ambient temperature around the microinverter's installation location. If ventilation is poor or the ambient temperature is too high, improve the ventilation to help dissipate heat. If both ventilation and temperature are within acceptable limits, contact your dealer or Hoymiles technical support for further assistance.
A
Annette ShermanAug 28, 2025
What to do if Hoymiles Inverter shows 10 min value grid overvoltage?
- J
  Jason RosalesAug 28, 2025
  If you get a '10 min value grid overvoltage' alarm on your Hoymiles microinverter, it could be a temporary issue with the grid voltage; the inverter should automatically recover when the voltage stabilizes. If the alarm persists, check if the grid voltage is within the correct range. If it is not, contact your local power operator or adjust the grid overvoltage protection limit via the Hoymiles monitoring system, with their approval.
X
xgarciaSep 1, 2025
What to do if Hoymiles HMT-1800-4T Inverter has software error code 126?
- S
  shellypetersonSep 1, 2025
  If your Hoymiles microinverter displays software error code 126 and continues to operate normally, no action is needed. However, if the error occurs frequently and affects performance, contact your dealer or Hoymiles technical support for assistance.
T
thughesSep 5, 2025
What to do if Hoymiles HMT-1800-4T has software error code 128?
- S
  Stephanie DanielSep 6, 2025
  If your Hoymiles microinverter displays software error code 128 and continues to operate normally, no action is needed. However, if the error occurs frequently and affects performance, contact your dealer or Hoymiles technical support for assistance.
J
julierichardsonSep 9, 2025
What to do if Hoymiles HMT-1800-4T has software error code 129?
- B
  bguzmanSep 9, 2025
  If your Hoymiles microinverter displays software error code 129 and continues to operate normally, no action is needed. However, if the error occurs frequently and affects performance, contact your dealer or Hoymiles technical support for assistance.

Hoymiles HMT-1800-4T Specifications

General

Model	HMT-1800-4T
Rated Power	1800W
Nominal Output Power	1800W
DC Input Voltage Range	16V - 60V
Input Voltage Range	16V - 60V
Nominal Output Current	7.83A
Output Voltage	230V
Output Frequency	50Hz / 60Hz
Max Efficiency	96.5%
Cooling Method	Natural Convection
Enclosure Rating	IP67
Number of MPPT Trackers	4
MPPT Voltage Range	16V-60V
Peak Power Tracking Voltage	25V - 55V
Nominal Output Voltage/Range	230 V
Ambient Temperature Range	-40°C to +65°C
Operating Temperature Range	-40 ~ +65°C
Protection Class	II
Communication	Wi-Fi

Summary

Important Notes and Safety Information

Safety Symbols and Meanings

Critical Safety Instructions

Key Safety Precautions for Installation and Operation

Outlines crucial safety measures for installation, operation, and maintenance.

Explanation of Safety and Operational Symbols

Installation Preparation Steps

Optimal Installation Location and Clearance

Specifies placement to avoid sunlight/rain, and required clearance for ventilation.

Connecting PV Modules to Microinverter

Guides on connecting PV modules to DC input ports and using extension cables.

Installation Tools and Circuit Capacity

AC Branch Circuit Loading Limits

Details maximum units per 12 AWG/10 AWG branch and OCPD for different models.

Installation Precautions

Microinverter Installation Procedures

Step 1: Plan and Install Microinverter

Covers marking positions, fixing screws, and mounting the microinverter.

Step 2: Build 3P-AC Trunk Cable

Step 2: AC Cable Connections and Routing

Installation Completion Steps

Step 3: Complete the AC Connection

Guides on plugging AC sub connector, connecting to distribution box, and sealing vacant ports.

Step 5: Connect PV Modules

Covers mounting PV modules and connecting their DC cables to the microinverter inputs.

Step 6: Energize the System

Step 7: Set Up Monitoring System

Troubleshooting Common Issues

Troubleshooting List and Solutions

Provides a list of error codes, alarm statuses, and suggested handling steps.

LED Indicator Status Guide

On-site Inspection and Routine Maintenance

On-site Inspection Procedures

Step-by-step inspection checklist for troubleshooting a malfunctioning microinverter.

Routine Maintenance and Safety

Microinverter Replacement Process

Decommissioning and Disposal

Microinverter Decommissioning

Technical Specifications

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