Hoymiles HMS-500-1A User manual

Open Energy for All
Single-phase Microinverter
HMS-500-1A
HMS-450-1A
HMS-400-1A
HMS-350-1A
HMS-300-1A
USER MANUAL
Region: Global V202306 hoymiles.com

© 2023 Hoymiles Power Electronics Inc. All rights reserved.
Single-phase Microinverter HMS-300&350&400&450&500-1A
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 exible 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 qualied 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 Hoymiles ocial website at www.hoymiles.com for the latest version.

© 2023 Hoymiles Power Electronics Inc. All rights reserved.
Single-phase Microinverter HMS-300&350&400&450&500-1A
1. Important Notes 1
1.1 Product Range 1
1.2 Target Group 1
1.3 Symbols Used 1
1.4 Safety Instructions 2
1.5 Explanation of Symbols 3
1.6 Radio Interference Statement 3
2. Product Information 4
2.1 Appearance and Size 4
2.2 Interface Layout 4
2.3 LED Indicator Status 5
3. Installation Preparation 6
3.1 Precautions 6
3.2 Wiring Diagram 7
3.3 Accessories 7
4. Installation Steps 8
4.1 Microinverter Installation 8
4.2 PV Module Installation 9
5. Troubleshooting 12
5.1 Troubleshooting List 12
5.2 Insulation Resistance Detection 14
5.3 On-site Inspection (For qualied installers only) 14
5.4 Routine Maintenance 15
6. Replacement and Decommission 16
6.1 Microinverter Replacement 16
6.2 Microinverter Decommission 17
6.3 Storage and Transportation 17
6.4 Disposal 17
7. Technical Data 18
CONTENTS

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 1
Single-phase Microinverter HMS-300&350&400&450&500-1A
1. Important Notes
1.1 Product Range
This manual describes the assembly, installation, commissioning, maintenance and troubleshooting of the
following models of Hoymiles 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 Hoymiles gateway DTU-Pro-S and DTU-Lite-S.
1.2 Target Group
This manual is only for qualied 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:
Important Notes
Symbol Description
This indicates a hazardous situation that can result in deadly electric shocks, other
serious physical injuries, or re 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.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 2
Single-phase Microinverter HMS-300&350&400&450&500-1A Important Notes
• You should get necessary approvals from local power operator before connecting the microinverter to the
power grid. This connection must be made only by qualied 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 ammable, 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 qualied spare parts which must be installed in accordance with their intended
use and by a licensed contractor or authorized Hoymiles service representative.
• Liabilities arising from components that are not produced by Hoymiles are on the part of their respective man-
ufacturers.
• Whenever the inverter has been disconnected from the public grid, please be extremely careful as some com-
ponents can retain charge sucient 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.
• Hoymiles 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.
• All operations including transportation, installation, start-up and maintenance must be carried out by
qualied, 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 specied 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.
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 in-
verter. The installer must read and follow all instructions, cautions and warnings in this installation manu-
al.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 3
Single-phase Microinverter HMS-300&350&400&450&500-1A
Symbol Usage
Treatment
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 rst
Please read the installation manual rst before installation, operation and maintenance.
Important Notes
1.6 Radio Interference Statement
This microinverter has been tested and complies with the requirements of CE EMC, meaning that it will not
be aected by electromagnetic interference. Please note that incorrect installation may cause electromag-
netic disturbances.
You can turn the equipment o 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 x 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.
1.5 Explanation of Symbols

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 4
Single-phase Microinverter HMS-300&350&400&450&500-1A
2. Product Information
2.1 Dimensions (mm)
Product Information
2.2 Interface Layout
204.5
90
184.5
550
90
165
26
8
AC Connector Wireless Terminal DC Connectors

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 5
Single-phase Microinverter HMS-300&350&400&450&500-1A Product Information
2.3 LED Indicator Status
The LED ashes ve times at start-up. The green ashes (1s gap) indicate normal start-up.
(1) During Start-up
• Flashing green ve times (0.3s gap): Start-up success
• Flashing Red ve times (0.3s gap): Start-up failure
(2) During Operation
• Fast green ashes (1s gap): Producing power
• Slow green ashes (2s gap): Input is abnormal
• Red ashes (0.5s gap): Invalid AC grid or hardware failure. Refer to Hoymiles Monitoring Platform for more details
• Red ashes (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 ashes 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 Hoymiles Monitoring Platform for more information.
LED

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 6
Single-phase Microinverter HMS-300&350&400&450&500-1A Installation Preparation
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 conrmed 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-ad-
justing clutch.
When installing the AC modules, please:
• make sure the environmental conditions t the microinverter’s requirements (degree of protection, tempera-
ture, humidity, altitude, etc.) as specied in the Technical Data section.
• install only on structures specically 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 ammable 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. Installation Preparation
3.1 Precautions
The equipment is installed based on the system design and the location of installation.

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Single-phase Microinverter HMS-300&350&400&450&500-1A Installation Preparation
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 micro-
inverter can be connected to the distribution box and the local grid network.
3.3 Accessories
Item Description
A AC Trunk Cable, 12/10 AWG Cable
BM5 × 15 screws (Prepared by the installer)
CAC Trunk Connector
D AC Trunk Port Cap
E AC Trunk Port Disconnect Tool
F AC Trunk Connector Unlock Tool
G AC Trunk End Cap
*Note:
All accessories above are not included in the package and should be purchased separately. Please contact the salesperson for
pricing.
BC D E F GA

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Single-phase Microinverter HMS-300&350&400&450&500-1A
4. Installation Steps
4.1 Microinverter Installation
1. Fix the microinverter to the PV module frame.
Installation Steps
c. Check and make sure the microinverter is properly xed to the 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).
Microinverter PV Modules

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 9
Single-phase Microinverter HMS-300&350&400&450&500-1A Installation Steps
2. Connect the microinverter to the PV modules.
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.
- Plug the upper cover back to the
Trunk connector.
click
Step 2: Install the AC cable (AC end cable).
- Prepare a segment of AC cable
of suitable length, with stripping
requirements fullled.
8-10mm
50±5mm
- Loosen the three screws with the
screwdriver. Untighten the cap and
remove the cable.
- Unlock the connector’s uppercover
with AC Trunk Connector Unlock
Tool.
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.
negative
input
- Insert the AC Trunk End cap and
screw the cap back to port, then
tighten the cap. 4.0±0.5N·m
positive
output
negative
output
positive
input

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 10
Single-phase Microinverter HMS-300&350&400&450&500-1A Installation Steps
- Insert the cable into the cap in
a way that the L, N and PE are in
corresponding slots.
L
PE
N
- Tighten the screws, and then
tighten the cap back to the port.
Plug the upper cover back to the
Trunk connector.
click
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.
4.2.2 Mounting PV Modules on Bracket and Completing AC Connection
Step 1: Complete the AC wiring of the microinverter.
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.
8-10mm
50±5mm
Step 2: Create an installation map.
- Peel the removable serial number
label (as shown in the gure) from
each microinverter.
- Ax the serial number label to
the corresponding location on the
installation map.
138264700571 138264700571
138264700571
LED

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 11
Single-phase Microinverter HMS-300&350&400&450&500-1A Installation Steps
Step 3: Fix the PV modules.
Put the PV modules on suitable locations in turn and x them rmly.
Step 4: Inspect the installation.
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.
click
- Plug the AC Trunk Port
Cap in any unused AC
Trunk Port for water and
dust-proong.
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 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)
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 min-
utes.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 12
Single-phase Microinverter HMS-300&350&400&450&500-1A
5. Troubleshooting
5.1 Troubleshooting List
Code Alarm
range Alarm status Handling suggestions
121 Over temperature
protection
1. Check the ventilation and ambient 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 conguration
parameter error
1. Check if the grid conguration 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 rmware 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 Oine
1. Please make sure that the microinverter works normally
(check if the DC voltage is within normal range and conrm 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 prole via Hoymiles monitoring system with the consent of
the local power operator.
Troubleshooting

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 13
Single-phase Microinverter HMS-300&350&400&450&500-1A Troubleshooting
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 undervoltage
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 undervoltage protection
limit in the grid prole via Hoymiles 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 overfrequency
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 overfrequency protection
limit via Hoymiles monitoring system with the consent of the
local power operator.
145 Grid Grid underfrequency
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 underfrequency protection
limit via Hoymiles 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 prole in the grid prole via
Hoymiles 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.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 14
Single-phase Microinverter HMS-300&350&400&450&500-1A Troubleshooting
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 Hoymiles 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 Hoymiles 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 Hoymiles technical support team.
209 PV-1 No input
1. Please conrm 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 undervoltage 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 Hoymiles technical support team.
5.2 Insulation Resistance Detection
A resistance sensor is contained in the microinverter to measure the resistance between the PV module out-
put 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 gener-
ating power and report the earth fault, which will persist until it is cleared on Hoymiles 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 Hoymiles
technicians in such case.
5.3 On-site Inspection (For qualied installers only)
Troubleshoot a malfunctioning microinverter according to the following steps.
1Check if the utility voltage and frequency are within the respective range shown in Technical Data section of
this manual.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 15
Single-phase Microinverter HMS-300&350&400&450&500-1A
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
xed.
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 lamentary 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
“Hoymiles Technical Note Limit Phase Balance” for more details.
Each branch should have a circuit breaker. Central protection unit is unnecessary.
Troubleshooting
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
rst to de-energize the inverter, and then disconnect the DC power.
Re-connect the PV modules to the microinverter. LED will ash red to indicate normal DC connection.
Re-connect the AC power. LED will ash green for ve 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 ve short LED ashes.
3Check the interconnection between all the microinverters on the AC branch circuit. Conrm 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.
6Make 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 Hoymiles customer support.
Do not try to repair the microinverter by yourself. If the troubleshooting fails, please return it to the factory
for replacement.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 16
Single-phase Microinverter HMS-300&350&400&450&500-1A Replacement and Decommission
6. 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 owing 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 xing 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 o, 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 nd 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.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 17
Single-phase Microinverter HMS-300&350&400&450&500-1A
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
Hoymiles 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.
Replacement and Decommission