Hoymiles DTU-Pro User manual

Open Energy for All
Single-phase Microinverter
USER MANUAL
DTU-Pro
Region: Global V202105 hoymiles.com

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 01
Single-phase Microinverter User Manual
CONTENTS
1. Important Safety Information 02
1.1 Read This First 02
1.2 Safety Instructions 02
1.3 User 02
1.4 Support and Contact Information 02
1.5 Other Information 02
2. Hoymiles Microinverter System 03
2.1 Microinverter 03
2.2 DTU 03
2.3 S-Miles Cloud (Hoymiles Monitoring Platform) 03
3. Interface Layout 03
3.1 Interface Layout 03
3.2 Export Management Function (RS485 port) 04
3.3 Remote Active Power Control (RS485 port) 04
3.4 DRM Port 05
3.5 Local Installation Assistant 05
4. DTU Installation 06
4.1 System Capacity 06
4.2 Basic Conditions Required 06
4.3 Dimensions 06
4.4 System Installation Sequence 07
4.5 Preparation 07
4.6 Install the DTU 07
5. Complete Installation Map 11
6. Site Creation on S-Miles Cloud (Hoymiles Monitoring Platform) 12
7. Customer Login 13
8. Browse the Web-Based Plant 13
9. View Phone App 14
10. LED Indicators 15
11. Technical Data 16

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 02
Single-phase Microinverter User Manual
1. Important Safety Information
1.1 Read This First
This manual includes important instructions for installing and maintaining the Hoymiles Data Transfer Unit
(DTU-Pro).
1.2 Safety Instructions
Symbol Usage
Indicates hazardous situations that can result in deadly electric shock hazards,
other serious physical injuries, or fire hazards.
Indicates directions that must be fully understood and followed in their entirety
to avoid potential safety hazards including equipment damage or personal
injury.
Indicates that the described operation must not be carried out. The reader
should stop, use caution, and fully understand the operations explained before
proceeding.
• Note that only professionals may install or replace DTU.
• Do not try to repair the DTU without approval from Hoymiles. If the DTU is damaged, send the DTU back
to your installer for repairing/replacement. Disassembling the DTU without approval from Hoymiles will
invalidate the remaining warranty period.
•Read all instructions and warnings on the technical specications carefully.
• Do not use Hoymiles products in a way that is not suggested by the manufacturer. Doing so may cause
death or injury to persons or damage to the equipment.
1.3 User
This manual is intended for use by professional installation and maintenance personnel only.
1.4 Support and Contact Information
If you have technical queries concerning our products, contact your system installer or distributor. If further
support is required, contact Hoymiles’ support at this link.
• www.hoymiles.com
• Hoymiles Technical Service Center: [email protected]
1.5 Other Information
Product information is subject to change without notice. The user manual will be frequently updated. refer to
the Hoymiles official website at www.hoymiles.com for the latest version.

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 03
Single-phase Microinverter User Manual
2. Hoymiles Microinverter System
2.1 Microinverter
It converts the DC output of PV modules into grid-compliant AC power. It sends the output information
of PV modules and the operation data of the microinverters to the DTU, which is the hardware basis of
module-level monitoring. With conversion efficiency up to 96.7% and MPPT efficiency up to 99.9%, Hoymiles
microinverters are among the high-quality microinverters in the world.
2.2 DTU
The DTU is a key component in the Hoymiles microinverter system. It works as the communication gateway
between the Hoymiles microinverters and the S-Miles Cloud (Hoymiles Monitoring Platform). The DTU
communicates wirelessly with the microinverters via 2.4 GHz Proprietary RF (Nordic), and collects the
operation data of the system. Meanwhile, the DTU connects to the Internet via the router and communicates
with the S-Miles Cloud (Hoymiles Monitoring Platform). The microinverter system operation data will be
uploaded to the S-Miles Cloud (Hoymiles Monitoring Platform) via DTU.
2.3 S-Miles Cloud (Hoymiles Monitoring Platform)
It collects the operation data and status of the microinverters in the system and provides module-level
monitoring for users and maintenance staff. The following diagram shows the operation of the Hoymiles
Microinverter System.
Microinverter
S-Miles Cloud (Hoymiles Monitoring
Platform)
Internet
Home Router
Ethernet or Wi-Fi
3. Interface Layout
3.1 Interface Layout
Item Description
A SD Card Slot
B DTU Power Indicator
C DTU Communication Indicator (With Server)

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 04
Single-phase Microinverter User Manual
D DTU Communication Indicator (With Microinverter)
E DTU Alarm Indicator
F Wi-Fi Antenna (2.4G)
G RS485
H DRM Port (For Australia only)
I Ethernet Port
J USB Port
K Reset Bottom
L Power Port
M 2.4G Antenna
3.2 Export Management Function (RS485 port)
a. Devices Required.
• Hoymiles Microinverter: 4-in-1 Unit, 2-in-1 Unit and Single Unit
• DTU: DTU-Pro:
• Meter: Chint Meter (DDSU666)/Chint Meter (DTSU666)/CCS WattNode Meter
b. Export Control Type.
• Type 1: Zero Export: limits the export power to zero to prevent the generated power fed back to the
grid.
• Type 2: Export Limit: limits the export power within a certain value.
• Type 3: Production and Consumption Monitoring: enable to measure the PV generation with high
accuracy.
c. Installation Diagram.
PV
Module
PV
Module
Hoymiles
MI-600
Hoymiles
MI-600
Solar
Local Load
Phase A
Phase B
Phase C
Neutral
Hoymiles
MI-600
Hoymiles
MI-600
PV
Module
PV
Module
PV
Module
PV
Module
PV
Module
PV
Module
Grid
Note: Refer to the “Hoymiles Export Management Technical Note” for more details.
3.3 Remote Active Power Control (RS485 port)
In some countries, it might be required that the generating plants should be equipped with a logic interface
(input port) to cease the output of active power or limit active power to a regulated level. This logic input can
be the RS485 port, Ethernet port, and so on. The DTU-Pro provides the RTU Modbus protocol over RS485 port
for this remote active power control. For more information, refer to the “Modbus Implementation Technical
Note”.

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 05
Single-phase Microinverter User Manual
3.4 DRM Port
The DRM port is provided to support several demand response modes as below by connecting the external
control device with a standard RJ-45 connector. The DTU-Pro can support DRM0/5/6/7/8 if used with Hoymiles
microinverters.
Mode Requirement
DRM0 Operate the disconnection device
DRM1 Do not consume power
DRM2 Do not consume at more than 50% of rated power
DRM3 Do not consume at more than 75% of rated power and source reactive power if capable
DRM4 Increase power consumption
(subject to constraints from other active DRMs)
DRM5 Do not generate power
DRM6 Do not generate at more than 50% of rated power
DRM7 Do not generate at more than 75% of rated power and sink reactive power if capable
DRM8 Increase power generation
(subject to constraints from other active DRMs)
3.5 Local Installation Assistant
Local Installation Assistant is a new function integrated with DTU-Pro. Download the Installer App (for
installer/distributor use only) before use.
The DTU-Pro is improved over the previous generations of DTU product, and is developed with this new
function that allows the installer to:
a. Complete the Wi-Fi configuration in one step.
b. See how many microinverters under this DTU are working properly (and the details for each microinverter)
and how many are abnormal (and the details for each microinverter) at a glance through the plant overall
inverter status indication.
c. Add connection status, which displays the signal strength between each microinverter with connected
DTU, so that the installer can adjust the DTU installation location accordingly. This function simplifies DTU
installation and avoids a second visit for installer due to the poor connections between DTU and certain
microinverters.
Note: Refer to the “Hoymiles Local Installation Assistant Technical Note” for more details.

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 06
Single-phase Microinverter User Manual
4. DTU Installation
4.1 System Capacity
The DTU-Pro is capable of monitoring up to 99 panels. If the communication between the DTU and the
microinverters suffers interference caused by installation conditions, the number of PV modules that the DTU
can monitor may be reduced.
Note: Max. monitoring quantity is for open space with ideal installation conditions described in both the
DTU and microinverter manuals. The distance between the microinverter and the DTU needs to be within the
required range.
4.2 Basic Conditions Required
Before installing the DTU, ensure that the site meets the following requirements:
• Standard 220 VAC power outlet.
• Stable broadband Internet connection.
• Router with Ethernet port.
Environmental requirements for DTU installation:
• Away from dust, liquid, acids, or corrosive gas.
• The temperature should be between -20ºC and 55ºC.
If you plan to install the DTU on the wall, prepare two #8 (4.166 mm diameter) screws and a screwdriver in
advance.
4.3 Dimensions
(Unit: mm)

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 07
Single-phase Microinverter User Manual
4.4 System Installation Sequence
1. Install the PV modules, microinverters
and repeater
2. Locate the DTU
3. Log in to the local interface of the DTU
4. Add Microinverter SNs
5. Check the communication between
microinverters and DTU
6. Mount the DTU on the wall (optional)
7. Connect to the Internet
8. Start procedure
9. Normal operation
4.5 Preparation
A. Download the Hoymiles Installer App.
B. Check the box for following items:
- Hoymiles DTU-Pro
- Two Antennas
- Adapter
- Bracket
- 5-Pin Plug
C. Choose the way DTU-Pro connects to the Internet:
Use Wi-Fi or Ethernet. Prepare for the following items, if needed:
- Ethernet Cable (if Ethernet option is selected).
- Hoymiles Installer App.
4.6 Install the DTU
Step 1: Install the antennas.
Take the two 2.4G antennas out of the box, and screw the antennas into the Wi-Fi port and 2.4G port.

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 08
Single-phase Microinverter User Manual
Note: If the DTU installation location is inside a metal box or under a metal/concrete roof, an extended
2.4G cable or 2.4G suction antenna is suggested, which can be purchased from Hoymiles or a local electrical
store (Contact Hoymiles Technical Service Center for the detailed type information of the cable or antenna at
[email protected]).
Step 2: Choose an installation location.
- Install on the top oor to increase signal strength.
- Install near the center of the PV array.
- Install at least 0.5 m above the ground and more than 0.8 m away from corners.
Note: Please do not install the DTU directly above metal or concrete to prevent signal interference.
Step 3: Choose the installation method.
Option 1: Mount the DTU on the wall.
- Screw the bracket on the wall, please use at least two screw holes (one on each side) to ax the bracket
(M4 screws need to be prepared by installer).
- Match the bracket’s upper buckle with the DTU-Pro.

© 2021 Hoymiles Power Electronics Inc. All rights reserved. 09
Single-phase Microinverter User Manual
- Match the bracket’s lower buckle by gently pressing the lower side of the DTU-Pro until you hear a clicking
sound. Please make sure the antennas are perpendicular to the wall.
Option 2: Place the DTU on the table.
- If you place the DTU on the table, please make sure the antennas are perpendicular to the table.
a. Plug in the power adapter to power the DTU.
b. Set up with Internet.
c. Use the smartphone/tablet to open the Installer App and login. Locate “Me” on the bottom of the page and
select “Network Config”. and then complete the Wi-Fi configuration (If Wi-Fi option is selected).
d. Use a LAN cable, with one end connected to the house router and the other to the DTU Ethernet port. Use
the smartphone/tablet to open the Installer App and login. Locate “Me” on the bottom of the page, select
“Network Config”, and then select “Ethernet” (if Ethernet is selected).