Hoymiles MI-250 User manual

Quick Installation Guide
MI-250/MI-300/MI-350/MI-400 AP040088 REV2.1 1 / 2
1. Accessories
Item
Description
A
AC End Cable (Female), 2m 12 AWG cable
B
M8*25 screws
C
DC Extension Cable, 1m
D
AC Female End Cap, IP67
*Note: All accessories above are not included in the package, and need to be purchased
separately. Please contact our sales representative for the price. (M8 screws need to be
prepared by installer-self.)
2. Installation Steps
Please make sure the microinverter is installed under the required environment.
(Please refer to product user manual for more details.)
Step 1. Fix Microinverter on the Rail
A) Mark the approximate center of each panel on the frame.
B) Fix the screw on the rail.
C) Hang the microinverter on the screw (shown as picture below), and tighten the screw.
The silver cover side of the microinverter should be facing the panel.
*Note: Please install the microinverter at least 50cm above the ground/roof for better
communication with Hoymiles DTU.
Step 2. Connect AC Cables of Microinverter
A) Plug the AC connector of the first microinverter with the connector of the second
microinverter, to form a continuous AC branch circuit.
*Note: The length of AC cable on microinverter is around 1.23m. If the distance between two
microinverters is more than 1.21m, please use the AC extension cable between two inverters
(As picture indicated below).
B) Install the AC end cap on the open AC connector of the last microinverter in the AC
branch circuit.
Step 3. Connect AC End Cable
A) Make the AC end cable.
1. Take the AC port apart into 3 parts:

Quick Installation Guide
MI-250/MI-300/MI-350/MI-400 AP040088 REV2.1 2 / 2
2. Insert the AC cable from Part 3 to Part 2, and complete the wiring for the L, N and Ground
inside Part 1 AC port accordingly:
*Note: L: Brown wire N: Blue wire G: Yellow/Green wire
Please use 12 AWG cable as AC end cable
3. Plug the AC port Part 2 into Part 1 once complete the wiring, and screw the Part 3 on
and complete the AC extension cable:
B) Connect the AC end cable to the AC male connector from the first microinverter to
complete the circuit.
C) Connect the other side of the AC end cable to the distribution box, and wire it to the local
grid network.
Step 4. Create an Installation Map
A) Peel the removable serial number label from each microinverter. (The position of the label
is shown as below.)
B) Affix the serial number label to the respective location on the installation map.
Step 5. Connect PV Modules
A) Mount the PV modules above the microinverter.
B) Connect the PV modules’ DC cables to the DC input side of the microinverter.
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 after
about two-minute wait time.
Step 7. Set Up the Monitoring System
Refer to the DTU User Manual or DTU Quick Install Guide, and Quick Installation Guide for
HMP Online Registration to install the DTU and set up your monitoring system.
Product information is subject to change without notice. (Please download reference manuals
at www.hoymiles.com.)