hoymiles HMS-500-1A Single Phase Microinverter User Manual

Open Energy for All
Single-phase Microinverter
USER MANUAL
HMS-500-1A/HMS-450-1A/HMS-400-1A
HMS-350-1A/HMS-300-1A

HMS-500-1A Single Phase Microinverter

About Microinverter
This system is composed of a group of microinverters that convert direct current (DC) into alternating current (AC) and feed the power to the public grid.
Each microinverter works independently so as to guarantee the maximum power generation of each PV module. This setup is highly flexible and reliable as the system enables direct control of the production of each PV module.
About the Manual
This manual contains important instructions for HMS-300/350/400/450/500-1A microinverters and users shall read in its entirety before installing or commissioning the equipment. For safety reasons, only qualified technicians who have received training or demonstrated relevant skills can install and maintain this microinverter under the guidance of this document.
Other Information
Product information is subject to change without notice. User manual will be updated regularly, so please refer to Homilies official website at www.hoymiles.com for the latest version.

Important Notes

1.1 Product Range
This manual describes the assembly, installation, commissioning, maintenance and troubleshooting of the following models of Homilies Microinverter:

• HMS-300-1A
• HMS-350-1A
• HMS-400-1A
• HMS-450-1A
• HMS-500-1A
  *Note:* “300” means 300 W, “350” means 350 W, “400” means 400 W, “450” means 450 W, “500” means 500 W.
  Note:** 300/350/400/450/500-1A is only compatible with Homilies gateway DTU-Pro-S and DTU-Lite-S.

1.2 Target Group
This manual is only for qualified technicians. For safety purposes, only those who have been trained or demonstrate relevant skills can install and maintain this microinverter under the guidance of this document.
1.3 Symbols Used
Safety symbols are used as follows:

shocks, other serious physical injuries, or fire incidents.
| This indicates that directions must be strictly followed to avoid safety hazards including equipment damage and personal injury.
| This indicates that the act is forbidden. You should stop, use caution and fully understand the operations explained before proceeding.

1.4 Safety Instructions
The HMS-300/350/400/450/500-1A microinverter is designed and tested according to international safety requirements. However, certain safety precautions must be taken when installing and operating this inverter. The installer must read and follow all instructions, cautions and warnings in this installation manual.

• All operations including transportation, installation, start-up and maintenance must be carried out by qualified, trained personnel.
• Check the product before installation to make sure there is no damage caused during transportation because such damage can compromise the insulation integrity and safety clearances. Choose installation location carefully and adhere to specified cooling requirements. Unauthorized removal of necessary protections, improper use, incorrect installation and operation may cause damage to the equipment or incur serious safety and shock hazards.
• You should get necessary approvals from local power operator before connecting the microinverter to the power grid. This connection must be made only by qualified technical personnel. It is the responsibility of the installer to provide external disconnect switches and Over Current Protection Devices (OCPD).
• Each input of the inverter is connected to one PV module. Do not connect batteries or other sources of power supply. The inverter can be used only if all the technical parameters are observed and applied.
• Do not install the equipment in flammable, explosive, corrosive, extremely hot/cold, and humid environment. Do not use the equipment when safety devices in these environments are not working.
• Personal protective equipment such as gloves and goggles must be used during installation.
• Inform the manufacturer about non-standard installation conditions.
• Do not use the equipment if any operating anomalies are found.
• All repairs must be done with qualified spare parts which must be installed in accordance with their intended use and by a licensed contractor or authorized Homilies service representative.
• Liabilities arising from components that are not produced by Homilies are on the part of their respective manufacturers.
• Whenever the inverter has been disconnected from the public grid, please be extremely careful as some components can retain charge sufficient to create a shock hazard. Before  touching any part of the inverter, please ensure the surface and the whole equipment  are within the limit of safe temperature and voltage potential.
• Homilies is not liable for any damage caused by incorrect or improper operation.
• Electrical installation and maintenance shall be conducted by licensed electrician and shall comply with local wiring rules.

1.5 Explanation of Symbols

To comply with European Directive 2002/96/EC on Waste Electrical and Electronic Equip- ment and its implementation as national law, electrical equipment that has reached the end of its life must be collected separately and returned to an approved recycling facility. Any device no longer needed must be returned to an authorized dealer or approved col- lection and recycling facility.
| Caution
Do not come within 8 inches (20 cm) of the microinverter when it is in operation.
| Danger of high voltage
High voltage in the microinverter can cause dangers to life.
**| Beware of hot surface
The inverter can become hot during operation. Avoid contact with metal surfaces during operation.
**| CE mark
The inverter complies with the Low Voltage Directive for the European Union.
**| Read manual first
Please read the installation manual first before installation, operation and maintenance.

1.6 Radio Interference Statement
This microinverter has been tested and complies with the requirements of CE EMC, meaning that it will not be affected by electromagnetic interference. Please note that incorrect installation may cause electromagnetic disturbances.
You can turn the equipment off and on to see if radio or television reception is interfered by this equipment. If this equipment does cause harmful interference to radio or television, please try the following measures to fix the interference:

1.  Relocate other apparatus’ antenna.
2. Move the microinverter farther away from the antenna.
3. Separate the microinverter and the antenna with metal/concrete materials or roof.
4. Contact your dealer or an experienced radio/TV technician for help.

Product Information

2.1 Dimensions (mm)

2.2 Interface Layout

2.3 LED Indicator Status
The LED flashes five times at start-up. The green flashes (1s gap) indicate normal start-up.

1. During Start-up
   • Flashing green five times (0.3s gap): Start-up success
   • Flashing Red five times (0.3s gap): Start-up failure

2. During Operation
   • Fast green flashes (1s gap): Producing power
   • Slow green flashes (2s gap): Input is abnormal
   • Red flashes (0.5s gap): Invalid AC grid or hardware failure. Refer to Hoymiles Monitoring Platform for more details
   • Red flashes (1s gap): Not producing power due to invalid AC grid
   • Solid red: Hardware failure. Please refer to Hoymiles Monitoring Platform for more details

3. Other Status
   • Red and Green flashes alternately: Firmware is broken

*Note:

1. The microinverter is powered by DC side. If the LED light is not on, please check the DC side connection. If the connection and input voltage are normal, contact your dealer or hoymiles technical support team.
2. All the faults are reported to the DTU. Refer to the local DTU app or Homilies Monitoring Platform for more information.

Installation Preparation

3.1 Precautions
The equipment is installed based on the system design and the location of installation.

When installing the microinverter, please:

• Check and ensure the mechanical compatibility of microinverter and PV module connectors, otherwise the microinverter may shut down due to earth fault and other functional problems.
• disconnect the equipment from the grid (power disconnect switch open) and keep the PV modules shaded or isolated.
•  ensure that the mounting surface or structure can support the microinverter and the mounting bracket, and that it is wider than the bracket.
• use the existing holes only instead of drilling more holes in the microinverter.
• consult the module manufacturer before drilling through the module frame, as it may void the warranty.
• have the drilling location on the module frame evaluated and confirmed by the module manufacturer, as improper drilling can compromise structural strength or damage the modules.
• do not use a hammer drill because the vibration may damage the microinverter and void the warranty.
• use either a torque wrench that meets the installation torque requirements or an electric drill with a self-adjusting clutch.

When installing the AC modules, please:

• make sure the environmental conditions fit the microinverter’s requirements (degree of protection, temperature, humidity, altitude, etc.) as specified in the Technical Data section.
• install only on structures specifically designed for PV modules (supplied by installation technicians).
• keep the microinverter in well-ventilated place to avoid overheating.
• keep the microinverter away from gases or flammable substances.
• avoid electromagnetic interference because it can compromise the normal operation of electronic equipment.
• use an appropriate lifting technology and auxiliary lift devices if needed to avoid muscle strain or back injuries.

3.2 Wiring Diagram
As shown in the wiring diagram below, the microinverter in the AC module system is mounted on the PV module frame. Its AC-side output connectors are connected to the AC Trunk Cable, through which the microinverter can be connected to the distribution
box and the local grid network.

3.3 Accessories

*Note:
All accessories above are not included in the package and should be purchased separately. Please contact the salesperson for pricing.

Installation Steps

4.1 Microinverter Installation

1. Fix the microinverter to the PV module frame.
   a. Identify the mounting location.
   – Plan and determine the optimal position on the PV module frame to mount the microinverter
   – Mark the position of each microinverter on the frame.
   – Drill holes at the marked positions on the PV module frame. b. Position the microinverters.
   – Position the microinverter on the designated mounting location, aligning its mounting holes with those on the PV module frame.
   – Fix the microinverter to the frame with M5 stainless screws. Torque the screws to 4-5 N·m (3.25-3.5ft/lb).c. Check and make sure the microinverter is properly fixed to the frame.

2. Connect the microinverter to the PV modules.
   a. Connect the positive output connector of the PV module to the positive input connector of the microinverter.
   b. Connect the negative output connector of the PV module to the negative input connector of the microinverter.

4.2 PV Module Installation
4.2.1 Making the Trunk Cables
Step 1: Determine the cable length and make a trunk cable.

1. Determine the cable length based on the PV module layout to ensure the trunk cable is aligned with each PV module.
2. Disassemble the AC Trunk Connector and remove the cable.
   – Unlock the connector’s upper over with AC Trunk Connector Unlock Tool. – Loosen the three screws with the screwdriver. Untighten the cap and remove the cable. – Insert the AC Trunk End cap and screw the cap back to port, then tighten the cap.– Plug the upper cover back to the Trunk connector.

Step 2: Install the AC cable (AC end cable).

• Prepare a segment of AC cable of suitable length, with stripping requirements fulfilled.
• Insert the cable into the cap in a way that the L, N and PE are in corresponding slots.
• Tighten the screws, and then tighten the cap back to the port. Plug the upper cover back to the Trunk connector.

Step 3: Adjust the position of the Trunk Connector according to that of the PV module. Securely attach the AC Trunk Cable to the mounting bracket with tie wraps.

1. Mark the position of each PV module on the mounting bracket.
2. Mount the PV module on the bracket (do not cover the AC Trunk Connector). Plug the AC Connector of the microinverter into the AC Trunk Connector until it clicks.

Step 2: Create an installation map.

• Peel the removable serial number label (as shown in the figure) from each microinverter.
• Affix the serial number label to the corresponding location on the installation map.

Step 3: Fix the PV modules.
Put the PV modules on suitable locations in turn and fix them firmly.

Step 4: Inspect the installation.

• Plug the AC Trunk Port Cap in any unused AC Trunk Port for water and dust-proofing.

Note:

1. Make sure that the AC Trunk Connectors are kept away from any drainage channels.
2. In case you need to remove the microinverter AC cable from AC Trunk Connector, insert the AC Trunk Port Disconnect Tool into the side of AC Sub Connector to complete the removal.

Step 5: Complete the installation.
Connect the other side of the AC cable to the distribution box, and wire it to the local grid network.
Step 6: 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 in about two minutes.

Step 7: Set up a monitoring system.
Refer to the “DTU User Manual”, “DTU Quick Installation Guide”, and “Quick Installation Guide for S-Miles Cloud” to install the DTU and set up the monitoring system.
Product information is subject to change without notice. (Please download reference manuals at www.hoymiles.com)

Troubleshooting

5.1 Troubleshooting List

temperature at the microinverter installation location.
2.  If the ventilation is poor or the ambient temperature exceeds the limit, please improve the ventilation and heat dissipation.
3.  If the problem persists when ventilation and ambient temperature are appropriate, contact your dealer or Hoymiles technical support team.
124| | Shut down by remote control| 1.  Check the status of zero export management and whether the microinverters were manually shut down.
2.  If the alarm still persists, please contact your dealer or Hoymiles technical support team.
125| | Grid configuration parameter error| 1.  Check if the grid configuration parameter is correct and upgrade.
2.  If the fault still exists, contact your dealer or Hoymiles technical support team.
127| | Firmware error| 1.  Check if the firmware is correct and has been upgraded.
2.  Check the communication between DTU and Hoymiles monitoring system, and between DTU and microinverter. Then try again.
3.  If the fault still exists, contact your dealer or Hoymiles technical support team.
129| | Abnormal bias| 1.  If the alarm occurs occasionally and the microinverter can still work normally, no special treatment is required.
2.  If the alarm occurs frequently and cannot be recovered, contact your dealer or Hoymiles technical support team.
130| | Offline| 1.  Please make sure that the microinverter works normally (check if the DC voltage is within normal range and confirm the status of the LED indicator).
2.  Check if the SN on microinverter label is the same as on the monitoring platform.
3.  Check the communication status between the DTU and Hoymiles monitoring system, and between the DTU and the microinverter. If the communication is poor, try to make some improvements.
4.  If the alarm occurs frequently and cannot be recovered, contact your dealer or Hoymiles technical support team.
141| Grid| Grid overvoltage| 1.  If the alarm occurs occasionally, the grid voltage may be just abnormal temporarily. The microinverter can automatically recover after grid voltage becomes normal.
2.  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 in the grid profile via Hoymiles monitoring system with the consent of the local power operator.
142| Grid| 10 min value grid overvoltage| 1.  If the alarm occurs occasionally, the grid voltage may be just abnormal temporarily. The microinverter can automatically recover after grid voltage becomes normal.
2.  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 Hoymiles monitoring system with the consent of the local power operator.
---|---|---|---
143| Grid| Grid under voltage| 1.  If the alarm occurs occasionally, the grid voltage may be just abnormal temporarily. The microinverter can automatically recover after grid voltage becomes normal.
2.   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 under voltage protection limit in the grid profile via Homilies monitoring system with the consent of the local power operator.
3.  If the fault still exists, check the AC switch or AC wiring.
144| Grid| Grid over frequency| 1.  If the alarm occurs occasionally, the grid frequency may be just abnormal temporarily. The microinverter can automatically recover after grid frequency becomes normal.
2.  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 over frequency protection limit via Homilies monitoring system with the consent of the local power operator.
145| Grid| Grid under frequency| 1.  If the alarm occurs occasionally, the grid frequency may be just abnormal temporarily. The microinverter can automatically recover after grid frequency becomes normal.
2.  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 under frequency protection limit via Homilies monitoring system with the consent of the local power operator.
146| **** Grid| Rapid grid frequency change rate| 1.  If the alarm occurs occasionally, the grid frequency may be just abnormal temporarily. The microinverter can automatically recover after grid frequency becomes normal.
2.  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 in the grid profile in the grid profile via Homilies monitoring system with the consent of the local power operator.
147| Grid| Power grid outage| Please check whether the AC switch, branch breaker and AC wiring is normal.
148| Grid| Grid disconnection| Please check whether the AC switch, branch breaker and AC wiring is normal.
149| Grid| Island detected| 1.  If the alarm occurs occasionally, the grid frequency may be just abnormal temporarily. The microinverter can automatically recover after grid voltage becomes normal.
2.  If the alarms occur frequently on all the microinverters in your station, contact the local power operator to check whether there is a grid island.
3. If the alarm still exists or happens on only several microinverters, please contact your dealer or Homilies technical support.
---|---|---|---
205| MPPT-A| Input overvoltage| 1.  Please make sure that the PV module open- circuit voltage is less than or equal to the maximum input voltage.
2.  If the PV module open-circuit voltage is within the normal range, contact your dealer or Homilies technical support team.
206| MPPT-B| Input overvoltage| 1.  Please make sure that the PV module open- circuit voltage is less than or equal to the maximum input voltage.
2.  If the PV module open-circuit voltage is within the normal range, contact your dealer or Homilies technical support team.
209| PV-1| No input| 1.  Please confirm whether this port is connected to the PV module.
2.  If the PV module is connected, please check the DC cable connection between this port and the PV module.
213| MPPT-A| PV-1 & PV-2 abnormal wiring| 1.  Please check whether the DC connections on port 1 and 2 are correct.
2. Check if the DC extension cable is made correctly.
215| PV-1| Input overvoltage| Check the input voltage of PV-1 port.
216| PV-1| Input under voltage| Check the input voltage of PV-1 port.
301 – 314| | Device failure| 1.  If the alarm occurs occasionally and the microinverter can still work normally, no special treatment is required.
2.  If the alarm occurs frequently and cannot be recovered, contact your dealer or Homilies technical support team.

5.2 Insulation Resistance Detection
A resistance sensor is contained in the microinverter to measure the resistance between the PV module output and the ground. The resistance may decrease if there is a problem with PV module insulation, DC wiring or module connectors. If the resistance falls
below the preset threshold, the microinverter will stop generating power and report the earth fault, which will persist until it is cleared on Homilies monitoring platform S-Miles Cloud and until the microinverter is restarted.
Note that the fault cannot be cleared if the cause is still present. Please contact your installer or Homilies technicians in such case.
5.3 On-site Inspection (For qualified installers only)
Troubleshoot a malfunctioning microinverter according to the following steps.

1. Check if the utility voltage and frequency are within the respective range shown in Technical Data section of this manual.

2. Check the connection to the utility grid.
   Disconnect the AC and the DC power. Please note that when the inverter is in operation, disconnect the AC power first to de-energize the inverter, and then disconnect the DC power.
   Re-connect the PV modules to the microinverter. LED will flash red to indicate normal DC connection.
   Re-connect the AC power. LED will flash green for five times to indicate normal DC and AC connection.
   Never disconnect the DC wires while the microinverter is producing power. Re- connect the DC module connectors and wait for five short LED flashes.

3. Check the interconnection between all the microinverters on the AC branch circuit. Confirm that each inverter is energized by the utility grid as described in the previous step.

4. Make sure that every AC breaker is functioning properly and is closed.

5. Check the DC connection between the microinverter and the PV module.

6. Make sure that PV modules’ DC voltage is within the allowable range shown in the Technical Data section of this manual.

7. If the problem persists, please call Homilies customer support.

Do not try to repair the microinverter by yourself. If the troubleshooting fails, please return it to the factory for replacement.
5.4 Routine Maintenance

1. Only authorized personnel are allowed to carry out the maintenance operations and are responsible for reporting any anomalies.
2. Always use personal protective equipment provided by the employer during maintenance operation.
3. During normal operation, check the environmental conditions regularly to make sure that the conditions have not changed over time and that the equipment is not exposed to adverse weather conditions and has not been obstructed.
4. DO NOT use the equipment if any problems are detected. Restore its working conditions after the fault is fixed.
5. Conduct annual inspections on various components, and clean the equipment with a vacuum cleaner or special brushes.

| Do not attempt to dismantle or repair the microinverter! No user-serviceable parts inside for the safety and insulation reasons!
---|---
| The AC output wiring harness (AC drop cable on the microinverter) cannot be replaced. The equipment should be scrapped if the cord is damaged.
| Maintenance operations must be carried out with the equipment disconnected from the grid (power switch open) and the PV modules shaded or isolated, unless otherwise indicated.
| Never clean the equipment with rags made of filamentary or corrosive materials to avoid corrosion and electrostatic charges.
| Do not attempt to repair the product. All repairs should be done using only eligible spare parts.
| If all the microinverters are connected to the DTU-Pro-S, the DTU can limit the output power imbalance of all the microinverters between phases to below 3.68 kW if required. Please refer to “Homilies Technical Note Limit Phase Balance” for more details.
| Each branch should have a circuit breaker. Central protection unit is unnecessary.

Replacement and Decommission

6.1 Microinverter Replacement
a. How to remove the microinverter
• De-energize the AC branch circuit breaker.
• Remove the PV module from the rack, and cover the module.
• Check the equipment with an electric meter and make sure there is no current flowing in the DC wires between module and microinverter.
• Remove the DC connectors with DC disconnect tool.
• Remove the AC Sub Connector with AC disconnect tool.
• Loosen the fixing screws on the top of the microinverter and remove the microinverter from the PV racking.
b. How to replace the microinverter in monitoring platform
• Please note down the new microinverter’s SN.
• Please make sure the AC branch circuit breaker is off, and install the replacement unit according to the microinverter installation steps.
• Go to the monitoring platform (if customer has already registered this station online), please access the “Device List” page and find the device that you just replaced. Please click “Device Maintenance” on the right side of the page, and select “Replace Device”. Input the new microinverter’s SN and click “Ok” to complete the station change.

6.2 Microinverter Decommission
Disconnect the inverter from DC input and AC output, remove all connection cables from the microinverter, and remove the microinverter from the frame.
Please pack the microinverter in the original packaging. If the original packaging is no longer available, you can use a carton box that can hold 5 kg and can be fully closed.
6.3 Storage and Transportation
Homilies packages are specially designed to protect components so as to facilitate transportation and subsequent handling. Transportation of the equipment, especially by road, must be done in a way that can protect the components (particularly the electronic components) from violent shocks, humidity, vibration, etc. Please dispose of the packaging elements in appropriate ways to avoid unforeseen injury.
Please examine the conditions of the components to be transported. Upon receiving the microinverter, you should check the container for any external damage and verify the receipt of all items. Please call the carrier immediately if there is any damage or if any parts are missing. In case of any damage caused to the inverter, contact the supplier or authorized distributor to request a repair/return and ask for instructions regarding the process.
The storage temperature range of microinverter is -40°C to 85°C.
6.4 Disposal

• If the equipment is not used immediately or is stored for a long period of time, make sure that it is properly packed. The equipment must be stored indoors with good ventilation and without any potential damage to the components of the equipment.
• Take a complete inspection when restarting the equipment after it has stopped operation for a long time.
• Please dispose of the microinverters properly in accordance with local regulations after they are scrapped because of potential harms to the environment.

Technical Data

Model| HMS-300-1A| HMS-350-1A| HMS-400-1A| HMS-| 450-1A| HMS-500-1A
---|---|---|---|---|---|---
Input Data (DC)
Commonly used module power (W)| 240 to 405+| 280 to 470+| 320 to 540+| 360| to 600+| 400 to 670+
Maximum input voltage (V)| | | 60| |
MPPT voltage range (V)| | | 16 to 60| |
Start-up voltage (V)| | | 22| |
Maximum input current (A)| 12| 13| 14| 15| 16
Maximum input short circuit current (A)| 20| 20| 25| 25| 25
Number of MPPTs| | | 1| |
Number of Inputs per MPPT| | | 1| |
Output Data (AC)
Rated output power (VA)| 300| 350| 400| 450| 500
Rated output current (A)| 1.30| 1.52| 1.74| 1.96| 2.17
Nominal output voltage/range (V)1| 230 / 180-275| 230 / 180-275| 230 / 180-275| 230 / 180-275| 230 / 180-275
Nominal frequency/range (Hz)1| | | 50 / 45-55| |
Power factor (adjustable)| | | > 0.99 default 0.8 leading … 0.8 lagging| |
Total harmonic distortion| | | < 3%| |
Maximum units per 12 AWG branch²| 15| 13| 11| 10| 9
Maximum units per 10 AWG branch²| 24| 21| 18| 16| 14
Efficiency
CEC peak efficiency| | | 96.70%| |
Nominal MPPT efficiency| | | 99.80%| |
Night power consumption (mW)| | | < 50| |
Mechanical Data
Ambient temperature range| | | -40℃ to +65℃ (-40°F to +149°F)| |
Storage temperature range| | | -40℃ to +85℃ (-40°F to +185°F)| |
Dimensions (W × H × D)
184.5 × 204.5 × 26 mm (7.26 x 8.05 x 1.02 inch)

1 Nominal voltage/frequency range can be changed due to the requirements of local power department.
2 Refer to local requirements for the exact number of microinverters per branch.

© 2023 Hoymiles Power Electronics Inc. All rights reserved.
Region: Global V202306
hoymiles.com

References

• Open Solar Energy for All | Hoymiles
• Open Energy For All - Hoymiles

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