Winpower MI Series User manual

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MI Series
Off-grid Single-phase Inverter
User Manual
SP Model
2KVA 48V WI20-48
2KVA 120V WI20-120
3KVA 24V WI30-240
5KVA 48V WI50-240

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Contents
1. Important Safety Warning............................................................................................................ １
2. Basic Information........................................................................................................................... ２
2.1 Introduction and Features........................................................................................................２
2.2 Product Structure.....................................................................................................................２
3. Product Installation........................................................................................................................３
3.1 Installation Notes.....................................................................................................................３
3.2 Installation and Wiring............................................................................................................ ３
3.2.1 Installation Space Choosing................................................................................................. ３
3.2.2 Electrical Connection........................................................................................................... ５
4. Operation Interface Introduction................................................................................................. ６
4.1 LCD Display............................................................................................................................６
4.2 LCD Information Define......................................................................................................... ７
5. Trouble Shooting............................................................................................................................ ７
6. Technical Parameters.....................................................................................................................９
7. Warranty..................................................................................................................................... １０

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1. Important Safety Warning
Before Using the machine, please read all instructions and cautionary markings on the unit and
this manual. Store the manual where it can easily be accessed.
This manual includes all safety warnings, installation, and operation guidance of MI series off-grid
inverter.
Before installing and using this machine, read all instructions and cautionary markings on the
machine and all appropriate sections of this guide.
Do not use the machine in the place where has flammability and explosive gas/articles. Beware
of flames and sparks.
Please Contact our after-sales person if the machine doesn’t work.
Do not change the electrical components and parts yourself, or we will not responsible for the
warranty items and related duties.
Please disconnect the connection between AC output, battery and machine before install or
maintain the machine. Besides, do not touch the machine in 5 mins after disconnection.
Do not plug/unplug DC terminal, AC terminal and battery when the inverter works.
Please use copper cable for line connection, and choose the right diameter of cable according to
the actual current.
Please keep good ventilation and heat dissipation.
Please install a circuit breaker outside the machine if conditions allow.
To avoid a risk of fire and electric shock, make sure the existing wiring is in good condition and
that the wire is connected tightly.
Do not restart the machine immediately when it alarms. Please analyze the fault reasons and
repair them at first.

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2. Basic Information
2.1 Introduction and Features
MI series is a kind of off-grid pure sine wave single-phase inverter. It is mainly applied in wind,
solar, wind&solar hybrid power generation station, household wind&solar hybrid power generation
system and power supply for those unmanned regions like the coastal islands, remote border posts.
Features
Can be applied in wind, solar, wind&solar hybrid power generation system.
Simple structure, complete function
Low no-load loss by using industrial frequency transformer
Compliant with CE requirements
2.2 Product Structure

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Chart1. Product Overview
①
Inverter indicator
⑤
AC output terminal
②
LCD display
⑥
Cooling fan
③
Inverter switch
⑦
AC output socket
④
Battery terminal
3. Product Installation
3.1 Installation Notes
1) The machine should be kept indoors and well ventilated;
2) Environment temperature: -20～+40℃; Humidity: <=95%，no condensing
3) Altitude should not be more than 4000m( ＞1000 m derating according to the GB/T3859.2
regulations).
4) Avoid using the machine in direct sunlight, sun exposure, rain, humidity, acid fog, and dust.
5) To guarantee the lifespan, it is suggested that the space around the device has no other items
within 30CM.
3.2 Installation and Wiring
3.2.1 Installation Space Choosing

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Chart2: Installation diagram

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3.2.2 Electrical Connection
Chart 3: System Overview
Please connect those parts according to the order of ①-②, and notice the following items.
1. Please adjust the inverse switch is to “OFF” status before installation.
2. Connect “+” “-” of the battery to “+” “-” of the “BATTERY” terminal on the machine
accoridngly. (Do not reverse the connection of positive and negative terminals)
3. Connect “N” and “L” and earth wire of the AC load to the “N”, “L” and “ ”terminals on the
machine.
4. Connect the grid to the AC input terminal if the machine has by-pass function.
5. Check all the connections to make sure they are connected rightly and tightly.
6. Turn on the switch and then the system can supply power normally.
Notes:
1) Do not connect any equipment in wrong polarity to the terminals on the machine.

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2) Please choose the inverter whose power is 3-5 times larger than the rated power labeled on these
machines if the load is inductive load such as refrigerator, electromotor, washing machine, and
water pump. Besides, please do not turn on them at the same time.
3) AC output socket can not be connected to equipments with large power. The ouput current
should be kept no more than 10A, or the socket will be overcurrent and even the inverter will be
burnt.
4) Do not connect “L” and “N” to the earth terminal, or the machine will be damaged forever.
5) “IVT Switch” is “on”, the inverter is turned on, if change it to “off”, the inverter is turned off.
4. Operation Interface Introduction
4.1 LCD Display
①
Work states
②
IVT indicator
③
Battery voltage
④
AC output voltage

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4.2 LCD Information Define
Icon
Statement
Inverter works normally
Inverter is on protection status, and no AC output
in such status.
"undervoltage”
Battery is on undervoltage status
“overvoltage”
Battery is on overvoltage status
“overload” flickers
The load is on short circuit status
“overload” keeps on
Output is on overload protection status
“over temperature”
The inverter is on over-temperature protection
status
5. Trouble Shooting
Fault Type
Analysis
Possible Solutions
No display
on LCD
The connection between the battery and the
machine is not tight
Check the wiring, and reconnect
it.
Fuse is cut off
Change a new fuse
Battery is over discharged or damaged.
Change the battery
System parameters are not matched correctly.
Recheck the label and parameters
on the machine.
No AC
output
IVT switch is off.
Change it to “ON”.
“undervoltage”
Battery voltage is low and
hasn’t reached the
undervoltage recovery
point; the inverter is on
When the battery reached the
undervoltage recovery point, the
output of the inverter will
recover automatically.

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undervoltage status.
“overvoltage”
Inverter doesn’t match
with the system.
Recheck the system parameters.
Battery is on overvoltage
status, for the charging
system doesn’t work
normally and over charge
the battery.
Check the actual voltage of the
battery, and confirm if the
charging system works normally.
“over
temperature”
Internal temperature of
the inverter is high, the
machine is on over
temperature protection
status.
keep good ventilation, or reduce
the load.
“overload”
“Overload” displays all
the time, output capacity
is more than the rated
output capacity of the
inverter.
Reduce the load power, and then
restart the IVT switch.
Short circuit
“Overload” flickers, the
load is short circuit.
Inverter starts “short
circuit” protection.
Solve the short circuit part and
restart the inverter.

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6. Technical Parameters
Model
WI20-48
WI20-120
WI30-240
WI50-240
DC Input Parameters
Rated battery voltage
48Vdc
120Vdc
240Vdc
240Vdc
Input overvoltage point
68Vdc
170Vdc
340Vdc
340Vdc
Input overvoltage
recovery point
66Vdc
165Vdc
330Vdc
330Vdc
Input undervoltage point
43.2Vdc
108Vdc
216Vdc
216Vdc
Input undervoltage
recovery point
48Vdc
120Vdc
240Vdc
240Vdc
AC Output Parameters
Output phase number
Single phase
Rated output power
2KVA
2KVA
3KVA
5KVA
Rated output voltage
110/120/220/230/240Vac
Rated output frequency
50/60±0.5HZ
THDi
<5%
Efficiency
Max. conversion
efficiency
≥85%
Protection Functions
DC input
overvoltage/undervoltag
e protection
YES
DC reversed connection
protection
YES
AC output overload
protection
YES
AC short circuit
protection
YES
Surge protection
YES
Over-temperature
protection
YES

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General Parameters
Display mode
LCD
Display information
Battery voltage, inverter voltage, inverter current, inverter power, and
working status of battery overvoltage/.undervoltage and AC output
overload/short circuit.
Isolation mode
Industrial frequency isolation
No-load current
≤0.6A
≤0.3A
≤0.15A
≤0.5A
Ambient temperature
-20℃～+40℃
Humidity
5%~95%, No condensing
Noise
<60dB
Cooling mode
Natural cooling
Cover protection class
IP20
Product dimension
(W*H*D)
235*352*400mm
320×525×560mm
Product net weight
20kg
27kg
47.5kg
Note: the listed specs are just for your reference
7. Warranty
The product shall be in warranty for one year from production. Please take contract as the final one if
it has special terms on warranty.