Hoymiles HMT-2250 Series User Manual

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User Manual

Three-phase Microinverter HMT-1800/2250

Version 1.0 ( 2020)EN

Table of Contents

Questions and Answers:

J
Jonathan RobertsonAug 30, 2025
Why is my Hoymiles Inverter showing 'Rapid grid frequency change rate'?
- J
  Joe BooneAug 30, 2025
  If the alarm occurs accidentally, the grid frequency may be abnormal temporarily. The microinverter can recover automatically after grid frequency becomes normal. If the alarm occurs frequently, check whether the grid frequency change rate is within the acceptable range. If not, contact the local power operator or change the grid frequency change rate limit via Hoymiles monitoring system with the consent of the local power operator.
K
Kevin JacksonAug 29, 2025
What should I do if my Hoymiles Inverter displays a grid underfrequency error?
- M
  Marie StrongAug 29, 2025
  If the alarm occurs accidentally, the grid frequency may be abnormal temporarily. The microinverter can recover automatically after grid frequency becomes normal. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If not, contact the local power operator or change the grid underfrequency protection limit via Hoymiles monitoring system with the consent of the local power operator.
W
Wayne WadeAug 28, 2025
What to do if Hoymiles Inverter shows grid overfrequency?
- M
  Meredith MillerAug 28, 2025
  If the alarm occurs accidentally, the grid frequency may be temporarily abnormal. The microinverter can recover automatically after the grid frequency becomes normal. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If not, contact the local power operator or change the grid overfrequency protection limit via the Hoymiles monitoring system with the consent of the local power operator.
A
Albert JordanAug 27, 2025
What should I do if my Hoymiles Inverter displays a grid undervoltage error?
- K
  Kevin GardnerAug 27, 2025
  If the alarm occurs once, the grid voltage may be temporarily abnormal. The microinverter should recover automatically once the grid voltage returns to normal. If the alarm occurs frequently, check whether the grid voltage is within the acceptable range. If not, contact the local power operator or change the grid overvoltage protection limit via the Hoymiles monitoring system with the consent of the local power operator.
M
Michelle MooreAug 27, 2025
What does it mean when my Hoymiles Inverter shows '10 min value grid overvoltage'?
- H
  haroldhernandezAug 27, 2025
  If this alarm appears once, it might indicate a temporary issue with the grid voltage. The microinverter should automatically recover when the grid voltage stabilizes. However, if the alarm is frequent, you should check if the grid voltage is within the normal range. If it is not, contact your local power operator or, with their consent, adjust the grid overvoltage protection limit using the Hoymiles monitoring system.
A
Ashley AguilarAug 25, 2025
What to do if my Hoymiles Inverter reports grid overvoltage?
- R
  Robert PageAug 26, 2025
  If the alarm occurs accidentally, it's possible the grid voltage is temporarily abnormal; the microinverter should recover automatically once the voltage returns to normal. However, if the alarm occurs frequently, verify that the 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 via the Hoymiles monitoring system.
T
Tiffany PerryAug 25, 2025
What to do if my Hoymiles Inverter is offline?
- A
  Ashley MccarthyAug 25, 2025
  First, ensure the microinverter is functioning correctly. Then, check the communication status between the DTU and the Hoymiles monitoring system, or between the DTU and the microinverter. If the communication is poor, try to improve it. If the alarm occurs frequently and cannot be resolved, it's recommended to contact your dealer or Hoymiles technical support.

Hoymiles HMT-2250 Series Specifications

General

Model	HMT-2250
Type	Microinverter
Maximum Output Power	2250 W
Output Voltage	230 V
Efficiency	96.5%
Maximum Output Current	9.8 A
CEC Weighted Efficiency	96%
Operating Temperature Range	-40°C to +65°C
Maximum Input Voltage	60 V
Output Frequency	50 Hz / 60 Hz
Cooling Method	Natural Convection
Protection Level	IP67
Input Voltage Range	16 V – 60 V
Communication	Wi-Fi
Nominal Output Voltage/Range	230 V
MPPT Voltage Range	16 V – 60 V

Summary

Important Notes

About Safety

Important Safety Instructions

Outlines critical safety precautions for installation and operation.

Explanation of Symbols

About Product

About Three-Phase Microinverter

Terminals Introduction

Installation Preparation

Module Compatibity

AC Branch Circuit Capacity

Specifies limits for microinverters per AC branch circuit and cable gauge.

Position and Space Required

Microinverter Installation

Accessories

Pre-installation

Installation Steps

Provides detailed, step-by-step instructions for installing the microinverter.

Troubleshooting

Troubleshooting List

Offers solutions for common alarm codes and error messages.

Status LED Indicator

Explains the meaning of different LED flash patterns for diagnostics.

On-site Inspection (For qualified installer only)

Provides a systematic guide for qualified technicians to diagnose issues.

Routine Maintenance

Replace Microinverter

Guides on the process of removing and replacing a microinverter.

Technical Data

DC Input

Lists the electrical specifications for the DC input from PV modules.

AC Output

Details the electrical specifications for the AC output.

Efficiency, Safety and Protection

Mechanical Data

Features

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