Hoymiles HMS-1800 User manual

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 1
Single-phase Microinverter HMS-1800/2000
Open Energy for All
Single-phase Microinverter
HMS-1800
HMS-2000
USER MANUAL
Region: Global V202109 hoymiles.com

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 2
Single-phase Microinverter HMS-1800/2000
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. The system is designed for the incorporation of
one microinverter for four photovoltaic modules.
Each microinverter works independently that guarantees the maximum power generation of each
photovoltaic module. This setup enables user to control the production of a single photovoltaic
module directly, thus improving the exibility and reliability of the system.
About the Manual
This manual contains important instructions for the HMS-1800-4T/HMS-2000-4T microinverter
and users shall read in its entirety before installing or commissioning the equipment. For safety,
only qualied technicians who have received training or demonstrate 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,
please refer to Hoymiles ocial website at www.hoymiles.com for the latest version.

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Single-phase Microinverter HMS-1800/2000
1. Important Notes 4
1.1 Product Range 4
1.2 Target Group 4
1.3 Symbols Used 4
1.4 Radio Interference Statement 4
2. About Safety 5
2.1 Important Safety Instructions 5
2.2 Explanation of Symbols 5
3. About Product 7
3.1 About microinverter PV system 7
3.2 About microinverter 7
3.3 About 4-in-1 Unit 7
3.4 About Sub-1G technology 8
3.5 Highlights 8
3.6 Terminals Introduction 8
3.7 Dimensions (mm) 9
4. Installation Preparation 9
4.1 Position and Space Required 9
4.2 Some instructions for connecting multiple PV modules to microinverter 9
4.3 Installation tools 10
4.4 AC Branch Circuit Capacity 10
4.5 Precautions 11
5. About Installation 12
5.1 Accessories 12
5.2 Installation Steps 12
6. Troubleshooting 16
6.1 Troubleshooting List 16
6.2 LED Indicator Status 19
6.3 On-site Inspection (For qualied installer only) 20
6.4 Routine Maintenance 20
6.5 Replace Microinverter 21
7. Decommissions 22
7.1 Decommissions 22
7.2 Storage and Transportation 22
7.3 Disposal 22
8. Technical Data 23
9. Appendix 1: 24
9.1 Installation Map 24
10. Appendix 2: 25
10.1 WIRING DIAGRAM – 230VAC SINGLE PHASE: 25
10.2 WIRING DIAGRAM – 230VAC / 400VAC THREE PHASE: 26
10.3 WIRING DIAGRAM –120VAC / 240VAC SPLIT PHASE: 27
10.4 WIRING DIAGRAM – 120VAC / 208VAC THREE PHASE: 28
CONTENTS

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 4
Single-phase Microinverter HMS-1800/2000
1. Important Notes
1.1 Product Range
This manual describes the assembly, installation, commissioning, maintenance and failure search of the
following model of Hoymiles Three-Phase Microinverter:
· HMS-1800-4T
· HMS-2000-4T
*Note: “1800” means 1800W, “2000” means 2000W.
HMS-1800/2000-4T 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
The safety symbols in this user manual are show as below.
Symbol Description
This indicates a hazardous situation that can result in deadly electric shocks,
other serious physical injury, 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. The user should stop, use caution and
fully understand the operations explained before proceeding.
1.4 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.
Important Notes

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Single-phase Microinverter HMS-1800/2000
2. About Safety
2.1 Important Safety Instructions
The HMS-1800-4T/HMS-2000-4T microinverter is designed and tested according to international safety re-
quirements. However, certain safety precautions must be taken when installing and operating this invert-
er. The installer must read and follow all instructions, cautions and warnings in this installation manual.
• All operations including transport, 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 transport damage because it
can aect 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.
• Before connecting the microinverter to the power distribution grid, contact the local power distri-
bution grid company to get necessary approvals. 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 photovoltaic 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 en-
vironment. Do not use the equipment when safety devices in these environments are not working.
• Use personal protective equipment, including gloves and goggles 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 re-
spective manufacturers.
• Whenever the inverter has been disconnected from the public grid, please be extremely careful as
some components can retain charge sucient to create a shock hazard. Before touching any part
of the inverter please ensure surfaces and equipment are within the limit of safe temperatures and
voltage potentials.
• 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.
About Safety

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Single-phase Microinverter HMS-1800/2000
2.2 Explanation of Symbols
Symbol Usage
Treatment
To comply with European Directive 2002/96/EC on waste Electrical and Electron-
ic Equipment 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 required must be returned to
an authorized dealer or approved collection and recycling facility.
Caution
Do not come within 8 inches (20 cm) of the microinverter when it is in operation.
Danger of high voltages
Danger to life due to high voltage in the microinverter.
Beware of hot surface
The inverter can become hot during operation. Avoid contact with metal surfac-
es during operation.
CE mark
The inverter complies with the requirements of the Low Voltage Directive for
the European Union.
FCC mark
The inverter complies with the requirements of the FCC standards.
Read manual rst
Please read the installation manual rst before installation, operation and main-
tenance.
About Safety

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Single-phase Microinverter HMS-1800/2000
3. About Product
3.1 About microinverter PV system
HMS-2000/1800-4T is a single-phase grid-connected microinverter, which is an important part of a PV
system. The inverter converts the DC power generated by PV modules into AC power that meets the re-
quirements of the power grid, and feeds it into the power grid. A typical application scenario of micro-mi-
croinverters is shown as follows.
3.2 About microinverter
Microinverter is an inverter that tracks the maximum power point of each PV module separately, and then is
connected to the AC power grid after the conversion from DC to AC.
The maximum power tracking voltage range is wide and the module conguration is exible. There may be
voltage and current mismatch between modules. When a module fails or is shaded, it will only aect its own
power generation and have no impact on the whole system.
The microinverter can monitor the current, voltage, power output and power generation of each module to
realize module-level data monitoring.
In addition, the microinverter only carries a DC voltage of a few tens of volts, which reduces safety hazards to
the greatest extent.
3.3 About 4-in-1 Unit
Microinverters can be divided into 1-in-1, 1-in-2, 1-in-4, etc. depending on how many PV modules are connect-
ed to the microinverter. This means that the microinverter can connect to one module, two modules and four
modules respectively, as shown below.
About Product
A PV module
B Microinverter
C Grid-connected metering device
D Grid
Sub-1G
Microinverter
Sub-1G Sub-1G

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Single-phase Microinverter HMS-1800/2000
With the output power up to 2000 VA, Hoymiles new microinverter HMS-2000 ranks among the highest for 4
in 1 microinverters.
Each microinverter connects to four PV modules at most with independent MPPT and monitoring, enabling
greater energy harvest and easier maintenance.
Hoymiles 4-in-1 unit microinverter is an ideal choice for PV system with uneven number of PV modules with
world’s best CEC weighted eciency – 96.50% (peak eciency 96.70%) in 2015.
3.4 About Sub-1G technology
Sub-1G technology is particularly useful for PV microinverters and is dierent from 2.4GHz technologies in
that it has substantially larger range and better interference suppression performance.
Range of Sub-1GHz wireless: Unlike WiFi or Zigbee which both operate on the 2.4 GHz band, Sub-1GHz oper-
ates on the 868 MHz or the 915 MHz band. Generally speaking, Sub-1GHz wireless transmission oers 1.5 to
2 times more distance coverage than the 2.4Ghz spectrum.
Interference: Sub-1GHz wireless can handle interference better. This is because it operates on a lower fre-
quency, so the communication between the microinverters and the DTUs is more stable. As a result, it is espe-
cially useful in industrial or commercial PV power plants.
Lower Power Consumption: Sub-1GHz wireless uses less power than Wi-Fi or Zigbee.
Because of the long range and better interference suppression performance, Sub-1GHz networking is partic-
ularly well-suited to rooftop PV power stations.
3.5 Highlights
- Maximum output power up to 1800/2000 W
- Peak eciency 96.50%
- Static MPPT eciency 99.80%, Dynamic MPPT eciency 99.76% in overcast weather
- Power factor (adjustable) 0.8 leading……0.8 lagging
- Sub-1G for stronger communication with DTU
- High reliability: IP67 (NEMA6) enclosure, 6000 V surge¬¬ protection
3.6 Terminals Introduction
Object Description
A Sub-1G Wireless Terminal
B DC Connectors
C AC Sub Connector
CAB
About Product

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Single-phase Microinverter HMS-1800/2000 About Product / Installation Preparation
3.7 Dimension(mm)
4. Installation Preparation
4.1 Position and Space Required
Please install the microinverter and all DC connections under the PV module to avoiding direct sunlight,
rain exposure, snow buildup, UV etc. The silver side of the microinverter should be up and facing the PV
module.
Allow a minimum of 2 cm of space around the microinverter enclosure to ensure ventilation and heat dissi-
pation.
*Note: In some countries, DTU will be required to meet local grid regulations (e.g. G98/99 for UK etc.)
4.2 Connecting multiple PV modules to microinverter
General Guidelines:
1. The DC input port of a microinverter is connected to a PV module.
2. When the cable is not long enough, use DC extension cable (The DC cable must comply with the regu-
lations in your area. Please consult the local power operator. At the same time, it is recommended that the
length of the DC side cable should not exceed 5 m, otherwise it may aect power production.
Two typical wiring methods are shown below.
A B C
331331
218
150150
570570
261

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Single-phase Microinverter HMS-1800/2000
4.3 Installation tools
Besides tools recommended below, other auxiliary tools can also be used on site.
Note: The voltage of modules (considering the eect of local temperature) must not exceed the maximum input
voltage of the microinverter. Otherwise, the microinverter may be damaged (refer to the Technical Data section
to determine the absolute maximum input voltage).
Installation Preparation
A PV module
B DC extension cable
C Microinverter
Screwdriver Multimeter
Socket Wrench or Allen wrench Marker pen
Diagonal pliers Steel tap
Wire cutters Cable tie
Wire stripper Torque and adjustable wrench
Utility knife
Safety glove Dust masks
Protective goggles Safety shoes
HMS-1800-4T HMS-2000-4T Maximum over current
protection device (OCPD)
Maximum number per
12AWG branch
2@220 V
2@230 V
2@240 V
2@220 V
2@230 V
2@240 V
20 A
Maximum number per
10AWG branch
3@220 V
4@230 V
4@240 V
3@220 V
3@230 V
3@240 V
32 A
30 A (For the US only)
4.4 AC Branch Circuit Capacity
Hoymiles HMS-1800-4T/HMS-2000-4T can be used with 12AWG or 10AWG AC Trunk Cable and the AC Trunk
Connector which are provided by Hoymiles. The number of microinverters on each 12AWG or 10AWG AC
branch shall not exceed the imit as shown below.
Note:
1. The number of microinverters that can be connected to each AC branch is determined according to the current
carrying capacity of the cable.
2. 1-in-1, 1-in-2 and 1-in-4 microinverters can be connected to the same AC branch, as long as the total current
does not exceed the cable carrying capacity specied in local regulations.