Introduction

The Hoymiles Single-phase Microinverter HM-1500 is a high-efficiency solar inverter designed to optimize energy production from photovoltaic systems. Capable of supporting up to four solar panels, it features dual Maximum Power Point Tracking (MPPT) technology, ensuring maximum energy harvest even in challenging conditions. The price for this microinverter is approximately $199.00. With a compact design and robust IP67 rating, the HM-1500 is built for durability and reliability. It operates within a wide voltage range and comes with a standard warranty of 12 years. 

Technical Data

• Warning: Be sure to verify the following before installing the Hoymiles Microinverter System.
• Verify that the voltage and current specifications of the PV module match those of the microinverter.
• The maximum open-circuit voltage rating of the PV module must be within the operating voltage range of the microinverter.
• The maximum current rating at MPP is recommended to be equal to or less than the maximum input DC current. But the maximum short-circuit current must be equal to or less than the maximum input DC short-circuit current.
• The output DC power of the PV module is NOT recommended to exceed 1.35 times the output AC power of the microinverter. Refer to the “Hoymiles Warranty Terms & Conditions” for more information.

DC Input

AC Output

Efficiency, Safety and Protection

Mechanical Data

Features

Note: Voltage and frequency ranges can be extended beyond nominal if required by the utility.

Important Notes

Product Range
This manual describes the assembly, installation, commissioning, maintenance and failure search for the following models of Hoymiles Microinverter:

• HM-1000
• HM-1200
• HM-1500

Note: “1000” means 1000 W, “1200” means 1200 W, “1500” means 1500 W.

Target User
For safety purposes, only a qualified technician who has received training or has demonstrated competence may install and maintain this microinverter under the guidance of this document.

Symbols Used
The safety symbols in this user manual are shown below.

About Safety

Important Safety Instructions

The HM-1000/HM-1200/HM-1500 Microinverter is designed and tested according to international safety requirements. However, certain safety precautions must be taken when installing and operating this microinverter. The installer must read and follow all instructions, precautions and warnings in this installation manual.

• All operations including transport, installation, start-up and maintenance must be carried out by qualified and trained personnel.
• Before installation, check the unit to ensure that it is free of any transport or handling damage, which could affect insulation integrity or safety clearances. Choose an installation location carefully and adhere to the specified cooling requirements. Unauthorized removal of necessary protections, improper use, and incorrect installation and operation may result in serious safety and shock hazards or equipment damage.
• Before connecting the microinverter to the power distribution grid, contact the local power distribution grid company to obtain the appropriate approvals. This connection must be made only by qualified technical personnel. It is the responsibility of the installer to provide external disconnect switches and Overcurrent Protection Devices (OCPD).
• Only one PV module can be connected to one input of the microinverter. Do not connect batteries or other power supply sources. The microinverter can be used only if all the technical characteristics are observed and applied.
• Do not install the equipment in adverse environments, such as environments that are flammable, explosive, corrosive, extremely hot or cold, or humid. Do not use the equipment when the safety devices do not work or are disabled.
• Always use personal protective equipment, including gloves and eye protection, while installing.
• Inform the manufacturer of non-standard installation conditions.
• Do not use the equipment if any anomalies are discovered while operating. Avoid temporary repairs.
• All repairs should be carried out by using only qualified spare parts, which must be installed in accordance with their intended use and by a licensed contractor or authorized Hoymiles service representative.
• Any liability arising from commercial components are delegated to their respective manufacturers.
• Any time the microinverter has been disconnected from the public network, please be extremely cautious, as some components can retain charge sufficient to create a shock hazard. Prior to touching any part of the microinverter, please ensure that surfaces and equipment are under safe touch temperatures and voltage potentials before proceeding
• Hoymiles accepts no liability for damage due to incorrect or improper operation.
• Electrical Installation & Maintenance shall be conducted by a licensed electrician and shall comply with local wiring regulations.

About Product

About 4-in-1 Unit
“Daisy-Chain 4-in-1 Unit Microinverter” with ultra-wide DC input operating voltage range (16 V–60 V) and low start-up voltage (22 V only).
The Hoymiles 4-in-1 Unit Microinverter HM-1000/HM-1200/HM-1500 is a reliable solution for PV systems with an uneven number of panels, and offers high CEC weighted efficiency – 96.50% (peak efficiency 96.70%) in 2015.

Highlights

• Maximum output power up to 1000 W/1200 W/1500 W. Adapted to 60-cell & 72-cell PV panels.
• Peak efficiency 96.70%. CEC weighted efficiency 96.50%.
• Static MPPT efficiency 99.80%. Dynamic MPPT efficiency 99.76% in overcast weather.
• Power factor (adjustable) 0.8 leading…0.8 lagging.
• External antenna for stronger communication with DTU.
• High reliability: NEMA 6 (IP67) enclosure. 6000 V surge protection.

Terminals Introduction

Dimension (mm)

About Function

Work Mode
Normal: In this mode, the microinverter operates normally and converts DC power into AC power to support the household loads and feeds into the public grid. Zero Export Control: In this mode, the microinverter’s generation is limited based on the current household loads, and there is no extra power fed into the public grid. Standby: There are several circumstances in which the microinverter will be in Standby mode:

• The current condition contradicts with the microinverter operating requirements.
• No household loads or the export control value has been set as “0” on the DTU in the Zero Export Control mode.

About Installation

Accessories

Description

The Hoymiles HM-1500 microinverter is a compact, lightweight device that can be easily installed on the back of solar panels. Its sleek design and weather-resistant housing ensure durability and reliability in various environmental conditions. The microinverter features advanced MPPT (Maximum Power Point Tracking) technology, which optimizes energy production by continuously tracking the maximum power point of the solar panel.

The HM-1500 also includes built-in Wi-Fi and Zigbee communication modules, enabling seamless integration with the Hoymiles monitoring system. This allows users to monitor their solar system's performance remotely through the Hoymiles app, providing real-time data on energy production, consumption, and system health.

Installation Precautions

Please install the microinverter and all DC connections under the PV module to avoid direct sunlight, rain exposure, snow pile-up, UV, etc. Allow a minimum of 2 cm of space around the microinverter enclosure to ensure ventilation and heat dissipation.
Note: For some countries, the DTU will be required to meet local grid regulations (e.g. G98/99 for UK).

Required Space Distance

If the microinverters are installed on a concrete roof or steel roof, their communication with the DTU may be slightly affected. Under such installation conditions, it is better for the microinverters to be installed 50 cm above the roof. Otherwise, more DTUs may be required to ensure communication quality between the DTUs and the microinverters.

Grounding Considerations

This microinverter is a Class I equipment with a basic isolation transformer, and this microinverter must be earthed. There is an earth wire inside the AC cable, so usually grounding can be done by directly using this wire. If the utility has any special requirements, grounding can be done by affixing the mounting bracket to the racking.

Preparation

Installation of this equipment is carried out based on the system design and the place in which the equipment is installed.

• Installation must be carried out with the equipment disconnected from the grid (power disconnect switch on) and with the PV modules shaded or isolated.
• Refer to the Technical Data to ensure that the environmental conditions fit the requirements of the microinverter (degree of protection, temperature, humidity, altitude, etc.)
• To avoid power de-rating due to an increase in the internal temperature of the microinverter, do not expose it to direct sunlight.
• To avoid overheating, always make sure that the air flow around the microinverter is not blocked.
• Do not install in places where gases or flammable substances may be present.

• Avoid electromagnetic interference that can compromise the correct operation of electronic equipment.

  

When choosing the installation position, comply with the following conditions:

• Only install on structures specifically conceived for PV modules (supplied by installation technicians).
• Install the microinverter underneath the PV modules to make sure that it operates in a shaded or shadowed environment. If this condition cannot be met, it may trigger the microinverter production de-rating.

Installation Steps

Step 1. Attach Microinverter on Rail

1. Mark the approximate center of each panel on the frame.
2. Fix the screw on the rail.

3. Hang the microinverter on the screw (as shown in the picture on the right), and tighten the screw. The silver cover side of the microinverter should be facing the panel.

   

Step 2. Connect AC Cables of Microinverter

1. Plug the AC connector of the first microinverter into the connector of the second microinverter to form a continuous AC branch circuit.
2. Note: The length of AC cable on microinverter is roughly 2.06 m, if the distance between two microinverters is more than the AC cable, please use an AC extension cable between two microinverters (as shown in the picture on the right).

3. Install the AC end cap on the open AC connector of the last microinverter in the AC branch circuit.

   

Step 3. Connect AC End Cable

1. Create the end cable
   1. Separate the AC port into 3 parts.
   2. Insert the AC cable from Part 3 to Part 2, and complete the wiring for the L, N and Ground inside the Part 1 AC port accordingly.
      Note:
      L: Brown wire
      N: Blue wire
      G: Yellow/Green wire
      Please use 12 AWG cable as the AC end cable.

   3. Plug the AC port Part 2 into Part 1 once the wiring is complete, then screw on Part 3 to complete the AC extension cable.

      

2. Connect the AC end cable to the AC male connector of the first microinverter to complete the circuit.
3. Connect the other side of the AC end cable to the distribution box, and wire it to the local grid network. Step

Create an Installation Map

1. Peel the removable serial number label from each microinverter (the position of the label is shown on the right).

2. Affix the serial number label to the respective location on the installation map.

   

Connect PV Modules

1. Mount the PV modules above the microinverter.

2. Connect the PV modules’ DC cables to the DC input side of the microinverter.

   

Energize the System

1. Turn on the AC breaker of the branch circuit.
2. Turn on the main AC breaker of the house. Your system will start to generate power after about two minutes of waiting time.

Set Up the Monitoring System

Refer to the DTU User Manual or DTU Quick Installation Guide, and Quick Installation Guide for S-Miles Cloud (Hoymiles Monitoring Platform) Online Registration to install the DTU and set up your monitoring system.

Troubleshooting

This microinverter can only work with the new Hoymiles DTU (DTU-Pro, DTU-Lite and DTU-W100/DTU-G100) with the following serial number.

Troubleshooting List

Status LED Indicator

The LED flashes five times at startup. All green flashes (1s gap) indicate normal startup.

Insulation Resistance Detection

There is a resistance sensor in the microinverter to measure the resistance between the outputs of PV module and the ground. If there is a problem with PV module insulation, DC wiring or connectors of the module and so on, the resistance between the outputs of the module and the ground may decrease. If this resistance drops below a preset threshold, the microinverter will stop producing power and report this ground fault. This fault will persist until it is cleared on the S-Miles Cloud (Hoymiles Monitoring Platform). This fault will persist until the microinverter is rebooted.
Please note that this fault cannot be cleared if the cause of the failure is still present. If the fault persists, contact your installer or Hoymiles for possible replacement.

On-site Inspection (for qualified installer only)

To troubleshoot an inoperable microinverter, follow the steps mentioned below.

Routine Maintenance

1. Only authorized personnel are allowed to carry out the maintenance operations, and such personnel are responsible for reporting any anomalies.
2. Always use the personal protective equipment provided by the employer when carrying out maintenance.
3. During normal operation, check that the environmental and logistical conditions are correct. Make sure that these conditions have not changed over time and that the equipment is not exposed to adverse weather conditions and has not been covered with foreign bodies.
4. DO NOT use the equipment if any problems are found, and restore the proper conditions after resolving the problems.
5. Conduct an annual inspection of the various components, and clean the equipment with a vacuum cleaner or special brushes.

Microinverter Replacement

Setup Guide

To set up the Hoymiles HM-1500 microinverter, follow these steps:

1. Mount the microinverter on the back of the solar panel, ensuring proper alignment and secure fastening.
2. Connect the DC cables from the solar panel to the microinverter.
3. Connect the AC cable from the microinverter to the household electrical system or grid connection point.
4. Configure the microinverter using the Hoymiles app or web portal, ensuring it is paired with your monitoring account.

Appendix

Installation Map

WIRING DIAGRAM

230 VAC SINGLE-PHASE:

230 VAC / 400 VAC THREE-PHASE:

120 VAC / 240 VAC SPLIT-PHASE:

120 VAC / 208 VAC THREE-PHASE

Pros & Cons

Pros:

• High Efficiency: Up to 97% efficiency ensures maximum energy harvesting.
• Real-time Monitoring: Detailed insights into energy production and consumption via the Hoymiles app.
• Compact Design: Easy to install and integrate with existing solar panel systems.
• Long Warranty: 25-year limited warranty provides peace of mind for long-term reliability.

Cons:

• Cost: Although competitively priced, it may still be out of budget for some homeowners.
• Complexity: Requires some technical knowledge for setup and configuration.
• Dependence on Technology: Relies on Wi-Fi or Zigbee for monitoring, which can be affected by network issues.

Customer Reviews

Customers have praised the Hoymiles HM-1500 for its ease of installation, high efficiency, and comprehensive monitoring capabilities. Some users have noted that the setup process can be slightly complex but overall appreciate the detailed real-time data provided by the Hoymiles app.

A common complaint is the occasional connectivity issue with the monitoring system, but these are generally resolved with a quick restart or update of the app.