Hoymiles Single-phase Microinverter USER MANUAL

About Microinverter

This system comprises microinverters that convert direct current (DC) to alternating current (AC) and feed it into the public grid. Designed for one microinverter per two PV modules, each unit operates independently, maximizing the power generation of each PV module. This setup enhances flexibility and system reliability by allowing direct control over single PV module production.

About the Manual

This manual contains essential instructions for the HM-1000/HM-1200/HM-1500 Microinverter. It must be read in its entirety before installation or commissioning. For safety, only qualified technicians with appropriate training or demonstrated competence should install and maintain the microinverter, following this document's guidance.

Other Information

Product information is subject to change without notice. This user manual is updated frequently. Please refer to the official Hoymiles website at www.hoymiles.com for the latest version.

1. Important Notes

1.1 Product Range

This manual covers the assembly, installation, commissioning, maintenance, and failure search for the following Hoymiles Microinverter models:

• HM-1000
• HM-1200
• HM-1500

Note: "1000" denotes 1000 W, "1200" denotes 1200 W, and "1500" denotes 1500 W.

1.2 Target User

For safety reasons, installation and maintenance of this microinverter should only be performed by qualified technicians who have received training or demonstrated competence, following the guidance in this document.

1.3 Symbols Used

The following safety symbols are used in this manual:

2. About Safety

2.1 Important Safety Instructions

The HM-1000/HM-1200/HM-1500 Microinverter is designed and tested according to international safety requirements. Adherence to specific safety precautions is mandatory during installation and operation. The installer must read and follow all instructions, precautions, and warnings in this manual.

• All operations, including transport, installation, start-up, and maintenance, must be performed by qualified and trained personnel.
• Before installation, inspect the unit for any transport or handling damage that could compromise insulation integrity or safety clearances. Select the installation location carefully, adhering to cooling requirements. Improper installation or use may lead to serious safety hazards or equipment damage.
• Before connecting to the power distribution grid, obtain appropriate approvals from the local power distribution grid company. This connection must be made by qualified technical personnel. The installer is responsible for providing external disconnect switches and Overcurrent Protection Devices (OCPD).
• Only one PV module can be connected to each microinverter input. Do not connect batteries or other power sources. The microinverter must be used only if all technical characteristics are observed.
• Do not install in adverse environments (flammable, explosive, corrosive, extreme temperatures, or high humidity). Do not use the equipment if safety devices are non-functional or disabled.
• Always use personal protective equipment (gloves, eye protection) during installation.
• Inform the manufacturer of any non-standard installation conditions.
• Do not use the equipment if anomalies are discovered during operation; avoid temporary repairs.
• All repairs must use qualified spare parts and be performed by a licensed contractor or authorized Hoymiles service representative.
• Liability for commercial components rests with their respective manufacturers.
• When disconnected from the public network, exercise extreme caution as components may retain charge. Ensure surfaces and equipment are at safe temperatures and voltage potentials before touching.
• Hoymiles is not liable for damage due to incorrect or improper operation.
• Electrical installation and maintenance must be conducted by a licensed electrician in compliance with local wiring regulations.

2.2 Explanation of Symbols

The following symbols are explained:

• Treatment: To comply with European Directive 2002/96/EC, electrical equipment at the end of its life must be separately collected and returned to an approved recycling facility.
• Caution: Do not approach within 8 inches of the microinverter for extended periods while it is operating.
• Danger of high voltages: Danger to life due to high voltage in the microinverter.
• Beware of hot surface: The microinverter can become hot during operation; avoid contact with metal surfaces.
• CE mark: Indicates compliance with the Low Voltage Directive for the European Union.
• Read manual first: Please read the installation manual before installation, operation, and maintenance.

2.3 Radio Interference Statement

This microinverter complies with CE EMC limits, providing reasonable protection against harmful energy. However, improper installation may cause harmful interference to radio equipment. There is no guarantee that interference will not occur in a specific installation. To test for interference, turn the equipment off and on. If interference occurs, try relocating the antenna, increasing separation, using shielding, or contacting a dealer or technician.

3. About Product

3.1 About 4-in-1 Unit

The "Daisy-Chain 4-in-1 Unit Microinverter" features an ultra-wide DC input operating voltage range (16 V-60 V) and a low start-up voltage (22 V). The Hoymiles HM-1000/HM-1200/HM-1500 is reliable for PV systems with uneven panel numbers, offering high CEC weighted efficiency (96.50%) and peak efficiency (96.70%) as of 2015.

3.2 Highlights

• Maximum output power: 1000 W / 1200 W / 1500 W. Suitable for 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 to 0.8 lagging).
• External antenna for enhanced communication with the DTU.
• High reliability: NEMA 6 (IP67) enclosure, 6000 V surge protection.

3.3 Terminals Introduction

The microinverter has the following terminals:

• A: AC Connector (Male)
• B: AC Connector (Female)
• C: DC Connectors

3.4 Dimension (mm)

Dimensions: 280 mm (width) x 176 mm (height) x 33 mm (depth).

4. About Function

4.1 Work Mode

• Normal: The microinverter converts DC power to AC power to supply household loads and feed into the public grid.
• Zero Export Control: Microinverter generation is limited to current household loads, preventing excess power from feeding into the grid.
• Standby: The microinverter enters standby mode under specific circumstances, such as when current conditions contradict operating requirements, or when there are no household loads and the export control value is set to "0" in Zero Export Control mode.

5. About Installation

5.1 Accessories

The following accessories are listed but may not be included in the package:

• A: AC End Cable (Female), 2 m 12 AWG Cable
• B: M8 × 25 Screws (installer-supplied)
• C: DC Extension Cable, 1 m
• D: AC Female End Cap, IP67

Contact the sales representative for pricing information.

5.2 Installation Precautions

Install the microinverter and all DC connections under the PV module to protect them from direct sunlight, rain, snow, and UV exposure. Ensure a minimum 2 cm space around the microinverter enclosure for ventilation and heat dissipation. Note: In some countries, a DTU may be required to meet local grid regulations (e.g., G98/99 for UK).

5.3 Required Space Distance

On concrete or steel roofs, microinverter communication with the DTU might be affected. It is recommended to install microinverters approximately 50 cm above the roof surface in such cases. Additional DTUs may be required to ensure adequate communication quality.

5.4 Grounding Considerations

This is a Class I equipment with a basic isolation transformer and must be earthed. The AC cable contains an earth wire for grounding. If the utility has specific requirements, grounding can be achieved by attaching the mounting bracket to the racking.

5.5 Preparation

Installation should be based on system design and location. Ensure the equipment is disconnected from the grid (power disconnect switch off) and PV modules are shaded or isolated before installation. Verify that environmental conditions (protection degree, temperature, humidity, altitude) meet microinverter requirements. Avoid exposing the microinverter to direct sunlight to prevent power de-rating. Ensure airflow around the microinverter is not blocked to prevent overheating. Do not install in areas with gases or flammable substances. Avoid electromagnetic interference. Install only on structures specifically designed for PV modules. Install the microinverter underneath PV modules for shading to prevent potential production de-rating.

5.6 Installation Steps

1. Attach Microinverter on Rail: Mark the center of each panel on the frame, fix a screw on the rail, and hang the microinverter on the screw, ensuring the silver cover faces the panel.
2. Connect AC Cables of Microinverter: Daisy-chain the microinverters by plugging the AC connector of one into the next. Use an AC extension cable if the distance exceeds the cable length (approx. 2.06 m). Install an AC end cap on the last microinverter's open AC connector.
3. Connect AC End Cable: Separate the AC port into three parts. Insert the AC cable into Part 2 and wire L (Brown), N (Blue), and Ground (Yellow/Green) into Part 1. Use 12 AWG cable. Connect Part 2 to Part 1 and secure Part 3 to complete the cable. Connect the AC end cable to the first microinverter and the other end to the distribution box, wiring it to the local grid.
4. Create an Installation Map: Peel the serial number label from each microinverter and affix it to the corresponding location on the installation map.
5. Connect PV Modules: Mount PV modules above the microinverter and connect their DC cables to the microinverter's DC input.
6. Energize the System: Turn on the AC breaker of the branch circuit, followed by the main AC breaker of the house. Power generation should commence after approximately two minutes.
7. Set Up the Monitoring System: Refer to the DTU User Manual or Quick Installation Guide for setting up the DTU and the Hoymiles Monitoring Platform.

6. Troubleshooting

This microinverter requires a Hoymiles DTU (DTU-Pro, DTU-Lite, or DTU-W100/DTU-G100) with specific serial numbers for operation.

6.1 Troubleshooting List

6.2 Status LED Indicator

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

• Startup Process: Five green flashes (0.3s gap) indicate startup success; five red flashes (0.3s gap) indicate startup failure.
• Running Process: Fast green flashing (1s gap) indicates producing power. Slow green flashing (2s gap) indicates producing power but with one abnormal input. Slow green flashing (4s gap) indicates producing power but no DTU communication. Red flashing (1s gap) indicates no power production due to AC grid fault (voltage/frequency out of range). Red flashing (0.5s gap) indicates a non-grid abnormality fault.
• Other Status: Alternating red and green flashing indicates corrupted firmware. Refer to the DTU app or S-Miles Cloud for more fault details.

6.3 Insulation Resistance Detection

A resistance sensor measures the resistance between PV module outputs and ground. If PV module insulation, DC wiring, or connectors are faulty, this resistance may decrease. If it drops below a threshold, the microinverter stops producing power and reports a ground fault. This fault persists until cleared on the S-Miles Cloud or the microinverter is rebooted. If the cause persists, contact your installer or Hoymiles.

6.4 On-site Inspection (for qualified installer only)

To troubleshoot an inoperable microinverter:

1. Verify utility voltage and frequency are within the Technical Data ranges.
2. Check grid connection. Verify utility power by removing AC then DC power. Never disconnect DC wires while producing power. Re-connect DC connectors and observe LED flashes.
3. Check AC branch circuit interconnection between microinverters. Verify each is energized by the utility grid.
4. Ensure AC breakers are functioning properly.
5. Check DC connections between the microinverter and PV module.
6. Verify PV module DC voltage is within the allowable range specified in the Technical Data.
7. If the problem persists, contact Hoymiles customer support.

Warning: Do not attempt to repair the microinverter. Return it to the factory for replacement if troubleshooting fails.

6.5 Routine Maintenance

1. Only authorized personnel should perform maintenance and report anomalies.
2. Always use provided personal protective equipment.
3. During normal operation, check environmental and logistical conditions, ensuring no adverse weather exposure or foreign bodies cover the equipment.
4. Do not use the equipment if problems are found; resolve issues before resuming operation.
5. Conduct annual inspections and clean components with a vacuum cleaner or special brushes.

Warning: Do not attempt internal repairs. The AC output wiring harness is not replaceable; if damaged, scrap the equipment. Maintenance must be done with the grid disconnected (power switch off) and PV modules obscured or isolated, unless otherwise specified. Use non-filamentary rags and avoid corrosive cleaning products. Avoid temporary repairs; use only genuine spare parts.

Caution: If multiple microinverters are connected to a DTU-Pro, the DTU can limit phase imbalance to below 3.68 kW. Refer to the "Hoymiles Technical Note Limit Phase Balance" for details.

6.6 Microinverter Replacement

a. How to remove the microinverter:

• De-energize the AC branch circuit breaker.
• Remove the PV panel from the racking and cover it.
• Use a meter to confirm no current in DC wires between the panel and microinverter.
• Use the DC disconnect tool to remove DC connectors.
• Use the AC disconnect tool to remove AC connectors.
• Unscrew the fixing screw and remove the microinverter from the PV racking.

b. How to replace the microinverter:

• Record the new microinverter's Serial Number (SN).
• Ensure the AC branch circuit breaker is off. Follow installation steps to install the replacement unit.
• On the Monitoring Platform, navigate to the "Devices" page, find the replaced device, click "Device Maintenance", select "Replace Device", enter the new SN, and click "OK".

7. Decommissioning

7.1 Decommissioning

Disconnect the microinverter from DC input and AC output. Remove all connection cables and then remove the microinverter from the frame. Pack the microinverter in its original packaging or a suitable carton box (supporting 5 kg) that can be fully closed.

7.2 Storage and Transportation

Hoymiles packages components for safe transport. Transportation must use suitable means to protect components from shocks, humidity, and vibration. Dispose of packaging elements appropriately. Customers must examine transported components upon receipt for external damage and verify all items are present. Report any damage or missing components immediately to the delivery carrier. If damage to the microinverter is found, contact the supplier or distributor for repair/return instructions. The microinverter storage temperature is -40°C to 85°C.

7.3 Disposal

• If the equipment is not used immediately or stored for long periods, ensure it is correctly packed and stored in well-ventilated indoor areas.
• Conduct a complete inspection when restarting after a long period of non-use.
• Dispose of scrapped equipment, which may be harmful to the environment, properly and in accordance with local regulations.

8. Technical Data

Warning: Verify the following before installing the Hoymiles Microinverter System:

• Ensure PV module voltage and current specifications match the microinverter.
• The PV module's maximum open-circuit voltage must be within the microinverter's operating voltage range.
• The maximum current rating at MPP should be equal to or less than the maximum input DC current. The maximum short-circuit current must be equal to or less than the maximum input DC short-circuit current.
• PV module output DC power should not exceed 1.35 times the microinverter's output AC power. Refer to Hoymiles Warranty Terms & Conditions for details.

8.1 DC Input

8.2 AC Output

8.3 Efficiency, Safety and Protection

8.4 Mechanical Data

8.5 Features

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