Hoymiles DTU User manual

Data Transfer Unit (DTU)
User Manual
AP213041144( ( REV1.0( (

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Corporate Headquarters Contact Information
Hoymiles Converter Technology Co.,Ltd.
No.18 Kangjing Road,
Hangzhou 310015,
China
www.hoymiles.com
[email protected]
Copyright Hoymiles Converter Technology Co.,Ltd. All rights reserved

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Table of Contents
1.(Important Safety Information(....................................................................................................(4(
Read this First(.............................................................................................................................(4(
Safety Instructions(......................................................................................................................(4(
Audience(......................................................................................................................................(4(
2.(The Hoymiles Microinverter System(........................................................................................(5(
3. DTU Basic Operation(....................................................................................................................(7(
3.1 LCD Screen Display at Start Up(........................................................................................(7(
3.2 Normal Operation(.................................................................................................................(7(
3.3 DTU local Interface(..............................................................................................................(8(
4. DTU Installation(...........................................................................................................................(14(
4.1 System Capacity(................................................................................................................(14(
4.2 Required Basic Conditions(...............................................................................................(14(
4.3 Installation Sequence(........................................................................................................(15(
4.4 Install the DTU(....................................................................................................................(16(
5. Troubleshooting(...........................................................................................................................(23(
5.1 LCD screen displays “NC”(................................................................................................(23(
5.2 The number of linked microinverters is less than total number of microinverters(....(23(
6. Technical Data(.............................................................................................................................(24(

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1. Important Safety Information
Read this First
This manual contains important instructions to follow during installation and maintenance of
the Hoymiles Data Transfer Unit (DTU).
Safety Instructions
·Be aware that only qualified person shall install or replace the DTU.
·(Do not attempt to repair the DTU as it contains the parts that are not serviceable to user. If
the DTU breaks down, please contact your distributor for maintenance. Opening the DTU
without permission will invalidate the warranty.
·(Please read all technical instructions and cautions in this manual and on the DTU before
installing and using DTU.
Audience
This manual is only for professional installation and maintenance personnel to use.

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2. The Hoymiles Microinverter System
The DTU is the key component in Hoymiles microinverter system. It works as the gateway,
which is the transfer station of monitoring information in the system. The DTU communicates
with microinverters wirelessly via 2.4G RF, collecting the operating data of the system.
Meanwhile, it sends control commands to microinverters for adjusting the operating state. In
addition, the DTU connects with the Internet to realize the mutual communication of
Hoymiles cloud monitoring platform. The operating data from microinverters and the control
commands from the cloud-monitoring server will be sent through the DTU to the other end.
The remote operation and maintenance are achieved.
The following diagram shows the DTU in the system.

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Other Elements in the Hoymiles Microinverter System
The Microinverter: Its main function is energy transfer. It converts the DC output of solar
modules into grid-compliant AC power. It also can send the output information of PV panels
and the operation data of the microinverters to the DTU, which is the hardware basis of the
panel-level monitoring. The efficiency of the Hoymiles microinverters is up to 96.7%, and the
MPPT efficiency of the Hoymiles microinverters is up to 99.9%.
The Remote Monitoring Server: It collects the operation data and status of the
microinverters in the system, and provides the panel-level monitoring for the users and
maintenance staffs.

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3. DTU Basic Operation
3.1 LCD Screen Display at Start Up
When the DTU starts up, it goes through the initial boot sequence. During this initial boot
sequence, the DTU LCD screen displays start-up progress as shown:
3.2 Normal Operation
When the DTU completes start and obtains the IP address, normal operation begins. During
the normal operation, the LCD screen displays the basic operation status of the system, and
the two screens shown as below alternate all the time.
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BOOT SYSsetup
10:26:30
System setup…
10:27:55
ETH_BSP_Config
10:27:55
IP: 0.0.0.0
YC 10:27:55 XXXX
IP: 192.168.1.122

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The data indicates:
(1) Web connection information: “YC”. This means the DTU is connected to the Internet.
If it is “NC”, the DTU is not connected to the Internet.
(2) Time, e.g. 10:27:55.
(3) Local IP address, e.g. 192.168.1. XXX.
(4) Data of the real-time output power in watts, e.g. 0.16kW.
(5) Data of the today’s output energy of the system in kWh, e.g. 0.07kWh.
(6) The total number of microinverters in this system, e.g. ALL: 05.
(7) The number of microinverters normally communicating with DTU, e.g. LINK: 01.
3.3 DTU local Interface
The DTU has the embedded web server. You can use a browser locally to view the
operation data and status of the system, manage the devices and clear fault. You need to
get your computer connected to the same network with DTU to open the DTU local interface
in your browser by entering the IP address shown on the LCD screen.
3.3.1 DTU Home Interface
The home interface shown below will turn up first when you enter the IP address into the
browser. In the home interface, the left side displays the basic information of the system,
including Total Output Power, Total Energy, Today Energy and CO2 Saved; the middle form
displays the operation data of each microinverter, including PV Voltage, Grid Voltage, Grid
Frequency, Grid Power, Today Energy and Internal Temperature. The upward side displays
the total number of microinverters, the number of connected microinverters and the number
of unconnected microinverters.
0.16Kw 0.07kWh
ALL:05 LINK:01

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3.3.2 Ground Fault Reset
Click “ConfigurationGFDI Fault” to open the ground fault interface. You can check whether
the microinverters have the ground fault or not. If the faults exist, click “Clear Fault” after
troubleshooting. If the problem persists, please contact our Technical Support.

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3.3.3 Time Setting
Click “ConfigurationDate/Time” to open the time setting interface. You can enter your local
date/time in the corresponding box and click “Send” to save.
3.3.4 Device ID Management
During the first-time installation or maintenance of DTU, you need to add or delete the
microinverters’ IDs to realize the monitoring of whole system.
(1) Manual Mode
Click “Device IDManual Config” to open the manual ID management interface.

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You need add the IDs into the blank box shown as below manually, and then click “Add ID”.

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After inputting all of microinverters’ IDs, you need to click “Reg ID” to finish registration. Then
you can see the detailed operating information of system in the home interface.
If one microinverter happens to break down and need to be replaced, you need to find that

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microinverter’s ID and click “Delete”.
(2) Auto Mode
Click “Device IDAuto Scan” to open the auto ID managemnet interface.
Click “Scan ID” to start automatic search for microinverters. When the DTU detects all the
microinverters’ IDs, you need to click “Reg ID” to finish registration. If the DTU cannot detect
all the microinverters in the system over 30 minutes, please use manual mode instead.

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4. DTU Installation
4.1 System Capacity
The DTU is capable of monitoring up to 99 MI-250 microinverters or 49 MI-500
microinvrerters.
4.2 Required Basic Conditions
1. Before installing the DTU, ensure the site meets the following requirements:
(1) Standard 220VAC power outlet
(2) Stable broadband Internet connection
(3) Router with Ethernet port or LAN
2. The DTU installation’s environmental requirements:
(1) Away from dust, liquid, acidic or corrosive gas
(2) Temperature between -20ºC and 45ºC
3. If you plan to install the DTU on the wall, two #8(4.166mm diameter) screws and a
screwdriver shall be prepared in advance.

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4.3 Installation Sequence
1. Install the PV modules
and microinverters
2. Locate the DTU
3. Connect to the Internet
4. Check the Internet
connection
6. Check the connection
between microinverters and
DTU
(
7. Wall-mount the DTU
(optional)
8. Complete the installation
map
9. Create a monitoring
account
5.Device ID management
10. View system
performance

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4.4 Install the DTU
To install the DTU, perform the following steps.
1. Install the PV Modules and Microinverters
Install the PV modules and the micorinverters as directed by the installastion manuals.
2. Locate the DTU
The communication distance of Hoymiles DTU is 200m in the open space. But in the real
installation, the environment may be more complex. It may have some obstacles like
walls or roofs, which will reduce the communication distance.
The range of signal reduction for possible obstacles at the site has been shown below:
Material
Relative signal range reductions
Wood/Glass
0-10%
Stone/Pressed cardboard
10%-40%
Reinforced concrete(reduction increases
with amount of reinforcement)
10%-90%
Metal
Up to 100%
Therefore, the DTU shall be placed as close to the microinverters as possible at the site
to ensure good communication between DTU and microinverters.
The typical installation positions of the DTU are shown as below. In the real installation,
you can refer to these scenarios.

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Ground Mounting Commercial Solar System

 

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Roof Mounting Residential Solar System
1. The wooden building:
2. The reinforced concrete building:

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3. Connect to the Internet
Connect to a broadband router using one of these two methods, described in the
following sections:
Ethernet Cable
Power Line Communication Bridges
(1) Ethernet Cable
a. Plug the Ethernet cable into the RJ-45 port on the DTU.
b. Plug the other end of the cable into a spare port on the broadband router.
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(2) Power Line Communication Bridges
a. Plug one of the bridges into the same AC outlet that the DTU is using.
b. Connect one end of the Ethernet cable to the Ethernet port on the DTU, connect the
other end of that Ethernet cable to the bridge.
c. Plug the other bridge to an AC outlet near the broadband router.
d. Connect one end of a second Ethernet cable to the second bridge, connect the other
end of the Ethernet cable into the broadband router.
e. Please refer to the user manual of power line communication bridge for the matching
and setting
f. If the broadband router is operational, connect the DTU to the power supply and wait
for connection.

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
   
    
 
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4. Check the Internet Connection
a. Look for the “YC” indication.”YC” indicates DTU communicates with the Internet.
b. If it still shows “NC” for several minutes after connecting to the broadband router, see
“Troubleshooting” on page 23.
5. Devices ID Management
Add all microinverters’ IDs by auto mode or manual mode, refer to “Devices ID
Management” on page 10.
6. Check the Connection between Microinverters and DTU
a. The following two methods will be used to check the connection between
microinverters and DTU:
(1) Open the local main interface. If the number of “total device” is the same with the
number of “on-line”, it indicates the communication of the DTU and microinverters is
normal.
YC 10:27:55 XXXX
IP: 192.168.1.122

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(2) Look for the LCD screen display. If the number of Linked microinverters is the same
with the number of total microinverters, it indicates the communication of the DTU and
microinverters is normal.
b. If the number of Linked microinverters is less than the number of all microinverters,
see “Troubleshooting” on page 23.
7. Wall Mounting(optional)
After the DTU has detected all microinverters of this system, you can mount the DTU on
a wall near this location.
lStep 1. Mount the DTU in a cool and dry location and avoid heat-generating devices
(oven, warmer).
lStep 2. Use two drywall screws or wall anchors to affix the DTU to the wall mounted
at the dimensions about 100mm. The maximum screw head diameter is 0.35”, a #8
screw is recommended.
lStep 3. Slide the DTU onto the mounting screws, aligning the DTU screw holes with
the screws installed in step 2.
0.16Kw 0.07kWh
ALL:05 LINK:05