Hoymiles HM-400NT User manual

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Region: North America AP040243 REV1.3 © 2022 Hoymiles Power Electronics Inc. All rights reserved.
1. Accessories
Item Description
AC Trunk Cable, 12/10 AWG Cable
M8 × 25 Screws
DC Extension Cable, 1 m
AC Trunk Port Disconnect Tool
AC Trunk Connector Unlock Tool
AC Sub Cap
AC Trunk End Cap, IP67
- Use the AC Trunk Connector Unlock Tool to
unlock the port upper cover.
*Note: All accessories listed above are not included in the package, and need to be purchased separately. Please contact our sales representative
for pricing information. (M8 screws need to be prepared by the installer.)
2. Installation Steps
Ensure the microinverter is installed in the required environment. (Refer to product user manual for more details.)
2.1 Pre-installation
A) Plan the cable length to make the bus cable aligned with each PV module.
B) Install the AC Trunk End Cap:
*Note: Please install the microinverter at least 50 cm above the ground/roof for better communication with the Hoymiles DTU.
2.2 Installation Steps
Step 1. Attach Microinverter on Rail
A) Mark the center of each panel on the frame.
B) Fix the screw on the rail.
HM-400NT Series Quick Installation Guide
C) Hang the microinverter on the screw (as
shown in the picture), and tighten the
screw. The silver cover side of the
microinverter should be facing the panel.
- Loosen the three screws with a screwdriver.
Untighten the cap as circled below, and
remove the extra cable.
- Screw the cap back into the port, and insert
the AC Trunk End Cap.
- Plug the upper cover back to the bus
connector.
*Applicable to HM-300NT/350NT/400NT microinverters

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Step 5. Connect PV Modules
Step 6. Energize the System
A) Turn on the AC breaker of the branch circuit.
B) Turn on the main AC breaker of the house.
Your system will start to generate power in
about two minutes.
A) Mount the PV modules above the
microinverter.
B) Connect the PV modules’ DC cables to the
DC input side of the microinverter.
Step 4. Create an Installation Map
A) Peel the removable serial number label
from each microinverter (the position of
the label is shown on the right).
B) Affix the serial number label to the
respective location on the installation map.
Product information is subject to change without notice. (Please download reference manuals at www.hoymiles.com.)
Step 3. Install AC End Cable
Region: North America AP040243 REV1.3 © 2022 Hoymiles Power Electronics Inc. All rights reserved.
B) Connect the other side of the AC end cable to the distribution box, and wire it to the local grid network.
Step 7. Set Up the 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 your monitoring system.
A) Prepare an AC end cable with proper
length and insert one side of the cable into
the cap. Insert the L, N and Ground lines
into the appropriate slots. Tighten the
screws, and then reinsert the cap tightly in
the port. Plug the upper cover back to the
bus connector.
C) If there is any vacant bus port, please insert
the AC Trunk Port Cap in the vacant plug to
ensure waterproofing and dustproofing.
*Note: Under circumstances that require
removing the inverter AC cable from bus port,
please use the AC Trunk Port Disconnect Tool
and insert the tool into the side of the AC port.
Coated with solder
Step 2. Complete AC Connection
A) Attach the AC Trunk Cable to the mounting
rail, and secure the cable with ties.
B) Push the AC connector of the microinverter
into the trunk cable connector until you
hear a clicking sound.
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Hoymiles Microinverter Installation Map
PleaseMake N for North
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AP040228 V1.3
CustomerInformation: DTUSerial Number
Azimuth:
Tilt:
Paneltype: