USER’S MANUAL User Axpert MKS PLUS 1KVA 2KVA 3KVA 4KVA 5KVA

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User Manual

1KVA-5KVA
INVERTER / CHARGER

Version: 2.3

Table Of Contents
ABOUT THIS MANUAL ..................................................................................................................................... 1
Purpose ............................................................................................................................................................ 1
Scope ............................................................................................................................................................... 1
SAFETY INSTRUCTIONS.................................................................................................................................. 1
INTRODUCTION ............................................................................................................................................... 2
Features ........................................................................................................................................................... 2
Basic System Architecture ............................................................................................................................... 2
Product Overview ............................................................................................................................................. 3
INSTALLATION ................................................................................................................................................. 4
Unpacking and Inspection................................................................................................................................ 4
Preparation ...................................................................................................................................................... 4
Mounting the Unit ............................................................................................................................................. 4
Battery Connection .......................................................................................................................................... 5
AC Input/Output Connection ............................................................................................................................ 7
PV Connection ................................................................................................................................................. 8
Final Assembly ................................................................................................................................................. 9
Communication Connection ........................................................................................................................... 10
Dry Contact Signal ......................................................................................................................................... 10
OPERATION ..................................................................................................................................................... 11
Power ON/OFF .............................................................................................................................................. 11
Operation and Display Panel ......................................................................................................................... 11
LCD Display Icons ......................................................................................................................................... 12
LCD Setting .................................................................................................................................................... 14
Display Setting ............................................................................................................................................... 24
Operating Mode Description .......................................................................................................................... 27
Fault Reference Code .................................................................................................................................... 28
Warning Indicator ........................................................................................................................................... 29
EQUALIZATION (Only available for 4KVA/5KVA model) ....................................................................... 30
How to Equalization ....................................................................................................................................... 30
SPECIFICATIONS ........................................................................................................................................... 31
Table 1 Line Mode Specifications ................................................................................................................... 31
Table 2 Inverter Mode Specifications ............................................................................................................. 32
*4KVA/5KVA only supports 230VAC system. .................................................................................................. 32
Table 3 Charge Mode Specifications .............................................................................................................. 33
TROUBLE SHOOTING ..................................................................................................................................... 35
Appendix: Approximate Back-up Time Table ........................................................................................... 36

ABOUT THIS MANUAL
Purpose
This manual describes the assembly, installation, operation and troubleshooting of this unit. Please read
this manual carefully before installations and operations. Keep this manual for future reference.

Scope
This manual provides safety and installation guidelines as well as information on tools and wiring.

SAFETY INSTRUCTIONS
WARNING: This chapter contains important safety and operating instructions. Read and
keep this manual for future reference.
1.

Before using the unit, read all instructions and cautionary markings on the unit, the batteries and all
appropriate sections of this manual.

CAUTION --To reduce risk of injury, charge only deep-cycle lead acid type rechargeable batteries.
Other types of batteries may burst, causing personal injury and damage.

Do not disassemble the unit. Take it to a qualified service center when service or repair is required.
Incorrect re-assembly may result in a risk of electric shock or fire.

To reduce risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning.
Turning off the unit will not reduce this risk.

CAUTION – Only qualified personnel can install this device with battery.

NEVER charge a frozen battery.

For optimum operation of this inverter/charger, please follow required spec to select appropriate cable
size. It’s very important to correctly operate this inverter/charger.

Be very cautious when working with metal tools on or around batteries. A potential risk exists to drop
a tool to spark or short circuit batteries or other electrical parts and could cause an explosion.

Please strictly follow installation procedure when you want to disconnect AC or DC terminals. Please
refer to INSTALLATION section of this manual for the details.

10. Fuses (3 pieces of 40A, 32VDC for 1KVA, 4 pieces of 40A, 32VDC for 2KVA and 6 pieces for 3KVA, 1
piece of 200A, 58VDC for 4KVA and 5KVA) are provided as over-current protection for the battery
supply.
11. GROUNDING INSTRUCTIONS -This inverter/charger should be connected to a permanent grounded
wiring system. Be sure to comply with local requirements and regulation to install this inverter.
12. NEVER cause AC output and DC input short circuited. Do NOT connect to the mains when DC input
short circuits.
13. Warning!! Only qualified service persons are able to service this device. If errors still persist after
following troubleshooting table, please send this inverter/charger back to local dealer or service center
for maintenance.

INTRODUCTION
This is a multi-function inverter/charger, combining functions of inverter, MPPT solar charger and battery
charger to offer uninterruptible power support with portable size. Its comprehensive LCD display offers
user-configurable and easy-accessible button operation such as battery charging current, AC/solar charger
priority, and acceptable input voltage based on different applications.

Features


Pure sine wave inverter



Built-in MPPT solar charge controller



Configurable input voltage range for home appliances and personal computers via LCD setting



Configurable battery charging current based on applications via LCD setting



Configurable AC/Solar Charger priority via LCD setting



Compatible to mains voltage or generator power



Auto restart while AC is recovering



Overload/ Over temperature/ short circuit protection



Smart battery charger design for optimized battery performance



Cold start function

Basic System Architecture
The following illustration shows basic application for this inverter/charger. It also includes following devices to
have a complete running system:
 Generator or Utility.
 PV modules (option)
Consult with your system integrator for other possible system architectures depending on your requirements.
This inverter can power all kinds of appliances in home or office environment, including motor-type appliances
such as tube light, fan, refrigerator and air conditioner.

Figure 1 Hybrid Power System
2

Product Overview

4KVA/5KVA single model

1-3KVA model

4KVA/5KVA parallel model
1. LCD display
2. Status indicator
3. Charging indicator
4. Fault indicator
5. Function buttons
6. Power on/off switch
7. AC input
8. AC output
9. PV input

1K-12V 230Vac model

10. Battery input

NOTE: For parallel model installation and operation,

11. Circuit breaker

please check separate parallel installation guide for

12. RS232 communication port

the details.

13. Parallel communication cable (only for parallel model)
14. Current sharing cable (only for parallel model)
15. Dry contact
16. USB communication port
3

INSTALLATION
Unpacking and Inspection
Before installation, please inspect the unit. Be sure that nothing inside the package is damaged. You should
have received the following items inside of package:
 The unit x 1
 User manual x 1
 Communication cable x 1
 Software CD x 1

Preparation
Before connecting all wirings, please take off bottom cover by removing two screws as shown below.

Mounting the Unit
Consider the following points before selecting where to install:
 Do not mount the inverter on flammable construction
materials.
 Mount on a solid surface
 Install this inverter at eye level in order to allow the LCD
display to be read at all times.
 The ambient temperature should be between 0°C and 55°C
to ensure optimal operation.
 The recommended installation position is to be adhered to
the wall vertically.
 Be sure to keep other objects and surfaces as shown in the
right diagram to guarantee sufficient heat dissipation and
to have enough space for removing wires.
SUITABLE FOR MOUNTING ON CONCRETE OR
OTHER NON-COMBUSTIBLE SURFACE ONLY.

Install the unit by screwing three screws. It’s recommended to use M4 or M5 screws.
1KVA 12V, 1-3KVA 24V,
1KVA/3KVA/4KVA/5KVA 48V model

2-3KVA 24V/48V Plus model

Battery Connection
CAUTION: For safety operation and regulation compliance, it’s requested to install a separate DC over-current
protector or disconnect device between battery and inverter. It may not be requested to have a disconnect
device in some applications, however, it’s still requested to have over-current protection installed. Please refer
to typical amperage in below table as required fuse or breaker size.

Ring terminal:

WARNING! All wiring must be performed by a qualified personnel.
WARNING! It's very important for system safety and efficient operation to use
appropriate cable for battery connection. To reduce risk of injury, please use the
proper recommended cable and terminal size as below.
Recommended battery cable and terminal size:
Model

Typical

Battery

Amperage

Capacity

Wire Size

Ring Terminal
Cable
2

Torque

Dimensions
D (mm)

L (mm)

Value

1KVA 48V

20A

100AH

1*14AWG

6.4

21.8

2~ 3 Nm

1KVA 24V, 2KVA 48V

33A

100AH

1*10AWG

6.4

22.5

2~ 3 Nm

3KVA 48V

50A

100AH

1*8AWG

6.4

23.8

2~ 3 Nm

1KVA 12V, 2KVA 24V

66A

100AH

1*6AWG

6.4

29.2

200AH

2*10AWG

6.4

23.8

3KVA 24V

100A

100AH

1*4AWG

6.4

33.2

200AH

2*8AWG

6.4

29.2

4KVA

120A

200AH

1*2AWG

6.4

39.2

2*6AWG

6.4

33.2

5KVA

120A

200AH

1*2AWG

6.4

39.2

2*6AWG

6.4

33.2

2~ 3 Nm
2~ 3 Nm
2~ 3 Nm
2~ 3 Nm

Please follow below steps to implement battery connection:
1. Assemble battery ring terminal based on recommended battery cable and terminal size.
2. Connect all battery packs as units requires. It’s suggested to connect at least 100Ah capacity battery for
1-3KVA model and at least 200Ah capacity battery for 4KVA/5KVA model.
3. Insert the ring terminal of battery cable flatly into battery connector of inverter and make sure the bolts are
tightened with torque of 2-3 Nm. Make sure polarity at both the battery and the inverter/charge is correctly
connected and ring terminals are tightly screwed to the battery terminals.

WARNING: Shock Hazard
Installation must be performed with care due to high battery voltage in series.

CAUTION!! Do not place anything between the flat part of the inverter terminal and the ring
terminal. Otherwise, overheating may occur.

CAUTION!! Do not apply anti-oxidant substance on the terminals before terminals are
connected tightly.

CAUTION!! Before making the final DC connection or closing DC breaker/disconnector, be sure
positive (+) must be connected to positive (+) and negative (-) must be connected to negative
(-).

AC Input/Output Connection
CAUTION!! Before connecting to AC input power source, please install a separate AC breaker between
inverter and AC input power source. This will ensure the inverter can be securely disconnected during
maintenance and fully protected from over current of AC input. The recommended spec of AC breaker is 10A
for 1KVA, 20A for 2KVA, 32A for 3KVA, 40A for 4KVA and 50A for 5KVA.
CAUTION!! There are two terminal blocks with “IN” and “OUT” markings. Please do NOT mis-connect input
and output connectors.
WARNING! All wiring must be performed by a qualified personnel.
WARNING! It’s very important for system safety and efficient operation to use appropriate cable for AC input
connection. To reduce risk of injury, please use the proper recommended cable size as below.
Suggested cable requirement for AC wires
Model

Gauge

Torque Value

1KVA

16 AWG

0.5~ 0.6 Nm

2KVA 230VAC

14 AWG

0.8~ 1.0 Nm

12 AWG

1.2~ 1.6 Nm

4KVA

10 AWG

1.4~ 1.6Nm

5KVA

8 AWG

1.4~ 1.6Nm

2KVA 120VAC
3KVA

Please follow below steps to implement AC input/output connection:
1. Before making AC input/output connection, be sure to open DC protector or disconnector first.
2. Remove insulation sleeve 10mm for six conductors. And shorten phase L and neutral conductor N 3 mm.
3. Insert AC input wires according to polarities indicated on terminal block and tighten the terminal screws. Be
sure to connect PE protective conductor ( ) first.
→Ground (yellow-green)
L→LINE (brown or black)
N→Neutral (blue)

WARNING:
Be sure that AC power source is disconnected before attempting to hardwire it to the unit.
4. Then, insert AC output wires according to polarities indicated on terminal block and tighten terminal screws.
Be sure to connect PE protective conductor (

) first.

→Ground (yellow-green)
L→LINE (brown or black)
N→Neutral (blue)

5. Make sure the wires are securely connected.

CAUTION: Important
Be sure to connect AC wires with correct polarity. If L and N wires are connected reversely, it may cause
utility short-circuited when these inverters are worked in parallel operation.
CAUTION: Appliances such as air conditioner are required at least 2~3 minutes to restart because it’s required
to have enough time to balance refrigerant gas inside of circuits.

If a power shortage occurs and recovers in a

short time, it will cause damage to your connected appliances. To prevent this kind of damage, please check
manufacturer of air conditioner if it’s equipped with time-delay function before installation. Otherwise, this
inverter/charger will trig overload fault and cut off output to protect your appliance but sometimes it still causes
internal damage to the air conditioner.

PV Connection
CAUTION: Before connecting to PV modules, please install separately a DC circuit breaker between inverter
and PV modules.
WARNING! All wiring must be performed by a qualified personnel.
WARNING! It'’ very important for system safety and efficient operation to use appropriate cable for PV module
connection. To reduce risk of injury, please use the proper recommended cable size as below.
Model
Typical Amperage
Cable Size
Torque
1KVA 12V
1KVA 24V / 2KVA 24V/
3KVA 24V
1KVA 48V / 3KVA 48V

40A

10 AWG

1.2~1.6 Nm

25A

12 AWG

1.2~1.6 Nm

18A

14 AWG

1.2~1.6 Nm

60A

8 AWG

1.4~1.6 Nm

80A

6 AWG

1.4~1.6 Nm

2KVA 24V Plus
3KVA 24V Plus
2KVA 48V Plus
3KVA 48V Plus
4KVA / 5KVA

PV Module Selection:
When selecting proper PV modules, please be sure to consider below parameters:
1. Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
2. Open circuit Voltage (Voc) of PV modules should be higher than min. battery voltage.
Solar Charging Mode
1KVA 24V

INVERTER MODEL

1KVA 12V

2KVA 24V
3KVA 24V

Max. PV Array Open Circuit Voltage
PV Array MPPT Voltage Range
Min. battery voltage for PV charge

102Vdc max

1KVA 48V 2KVA 24V Plus/
3KVA 48V 3KVA 24V Plus

75Vdc max 102Vdc max

2KVA 48V Plus/
3KVA 48V Plus/
4KVA/5KVA

145Vdc

15~80Vdc

30~66Vdc

60~88Vdc

30~115Vdc

60~115Vdc

8.5Vdc

17Vdc

34Vdc

17Vdc

34Vdc

Please follow below steps to implement PV module connection:
1. Remove insulation sleeve 10 mm for positive and negative conductors.
2. Check correct polarity of connection cable from PV modules and PV input
connectors. Then, connect positive pole (+) of connection cable to positive
pole (+) of PV input connector. Connect negative pole (-) of connection
cable to negative pole (-) of PV input connector.

3. Make sure the wires are securely connected.

Final Assembly
After connecting all wirings, please put bottom cover back by screwing two screws as shown below.

1KVA/2KVA/3KVA/4KVA/5KVA

2KVA Plus/3KVA Plus

Communication Connection
Please use supplied communication cable to connect to inverter and PC. Insert bundled CD into a computer and
follow on-screen instruction to install the monitoring software. For the detailed software operation, please
check user manual of software inside of CD.

Dry Contact Signal
There is one dry contact (3A/250VAC) available on the rear panel. When program 38 is set as “disable”, it could
be used to deliver signal to external device when battery voltage reaches warning level. When program 38 is
set as “enable” and the unit is working in battery mode, it could be used to trigger the grounding box to
connect neutral and grounding of AC output together.
When program 38 is set as “disable” (default setting):

Unit Status

Power Off

Condition

NC & C

NO & C

Unit is off and no output is powered.

Open

Output is powered from Utility.

Open

Output

powered

Program 01

Battery voltage < Low DC warning

set as Utility

voltage

from
Battery
Power On

Dry contact port:

Battery voltage > Setting value in
or

Program 13 or battery charging

Solar.

reaches floating stage
Program 01

Battery voltage < Setting value in

Program 12

Battery voltage > Setting value in

set

SBU
Solar first

Program 13 or battery charging
reaches floating stage

When program 38 is set as “enable”:

Unit Status

Condition

Dry contact port:
NC & C

NO & C

Power Off

Unit is off.

Open

Power On

Output is powered from Battery or Solar

Open

OPERATION
Power ON/OFF

Once the unit has been properly installed and the batteries are connected well, simply press On/Off switch
(located on the button of the case) to turn on the unit.

Operation and Display Panel
The operation and display panel, shown in below chart, is on the front panel of the inverter. It includes
three indicators, four function keys and a LCD display, indicating the operating status and input/output
power information.

LCD display

LED indicators
Function keys

LED Indicator
LED Indicator
Green
Green
Red

Messages
Solid On

Output is powered by utility in Line mode.

Flashing

Output is powered by battery or PV in battery mode.

Solid On

Battery is fully charged.

Flashing

Battery is charging.

Solid On

Fault occurs in the inverter.

Flashing

Warning condition occurs in the inverter.

Function Keys
Function Key

Description

ESC

To exit setting mode

To go to previous selection

DOWN

To go to next selection

ENTER

To confirm the selection in setting mode or enter setting mode

LCD Display Icons

Icon

Function description

Input Source Information
Indicates the AC input.
Indicates the PV input
Indicate input voltage, input frequency, PV voltage, battery voltage and
charger current.
Configuration Program and Fault Information
Indicates the setting programs.
Indicates the warning and fault codes.

Warning:

Fault:

flashing with warning code.

lighting with fault code

Output Information
Indicate output voltage, output frequency, load percent, load in VA, load in
Watt and discharging current.
Battery Information
Indicates battery level by 0-24%, 25-49%, 50-74% and 75-100% in battery
mode and charging status in line mode.
In AC mode, it will present battery charging status.
Status

Battery voltage
<2V/cell

Constant

2 ~ 2.083V/cell

Current mode /
Constant
Voltage mode

LCD Display
4 bars will flash in turns.
Bottom bar will be on and the other three
bars will flash in turns.
Bottom two bars will be on and the other
two bars will flash in turns.
Bottom three bars will be on and the top

2.083 ~ 2.167V/cell
> 2.167 V/cell

bar will flash.

Floating mode. Batteries are fully charged.

4 bars will be on.

In battery mode, it will present battery capacity.
Load Percentage

Battery Voltage

LCD Display

< 1.717V/cell
1.717V/cell ~ 1.8V/cell
Load >50%

1.8 ~ 1.883V/cell
> 1.883 V/cell
< 1.817V/cell
1.817V/cell ~ 1.9V/cell

50%> Load > 20%

1.9 ~ 1.983V/cell
> 1.983
< 1.867V/cell
1.867V/cell ~ 1.95V/cell

Load < 20%

1.95 ~ 2.033V/cell
> 2.033

Load Information
Indicates overload.
Indicates the load level by 0-24%, 25-49%, 50-74% and 75-100%.
0%~24%

25%~49%

50%~74%

Mode Operation Information
Indicates unit connects to the mains.
Indicates unit connects to the PV panel.
Indicates load is supplied by utility power.
Indicates the utility charger circuit is working.
Indicates the DC/AC inverter circuit is working.
Mute Operation
Indicates unit alarm is disabled.

75%~100%

LCD Setting
After pressing and holding ENTER button for 3 seconds, the unit will enter setting mode. Press “UP” or “DOWN”
button to select setting programs. And then, press “ENTER” button to confirm the selection or ESC button to
exit.
Setting Programs:
Program

Description

Selectable option
Escape

Exit setting mode
Solar energy provides power to the
loads as first priority.
If solar energy is not sufficient to
power all connected loads, battery
Solar first

energy will supply power the loads at
the same time.
Utility provides power to the loads only
when any one condition happens:
- Solar energy is not available
- Battery voltage drops to either
low-level warning voltage or the
setting point in program 12.

Output source priority:
01

To configure load power

Utility will provide power to the loads
Utility first (default)

source priority

as first priority.
Solar and battery energy will provide
power to the loads only when utility
power is not available.
Solar energy provides power to the
loads as first priority.
If solar energy is not sufficient to

SBU priority

power all connected loads, battery
energy will supply power to the loads
at the same time.
Utility provides power to the loads only
when battery voltage drops to either
low-level warning voltage or the
setting point in program 12.

Available options in 1KVA 12V model:

Maximum charging current:
To configure total charging
current for solar and utility
chargers.
(Max. charging current =
utility charging current +
solar charging current)

10A

20A

30A

40A (default)

50A

60A

Available options in 1KVA 24V and 1KVA/3KVA 48V models:

Maximum charging current:
To configure total charging
current for solar and utility
chargers.
(Max. charging current =
utility charging current +
solar charging current)

10A

20A (default)

30A

40A

Available options in 2-3KVA 24V models:
20A

30A (default)

40A

50A

60A

Available options in 2-3KVA 24V/48V Plus models:
10A (Not available
for 2-3KVA 24V Plus)

Maximum charging current:
To configure total charging
current for solar and utility
chargers.
(Max. charging current =
utility charging current +
solar charging current)

20A

30A

40A

50A

60A (default)

70A

80A

90A (Not available for 2-3KVA 48V Plus)

Available options in 4K/5K model
10A

20A

30A

40A

50A

60A (default)

70A

80A

90A

100A

110A

120A

130A

140A

Appliances (default)

If selected, acceptable AC input
voltage range will be within

AC input voltage range

90-280VAC.
UPS

If selected, acceptable AC input
voltage range will be within
170-280VAC.

Power saving mode
enable/disable

Saving mode disable

If disabled, no matter connected load

(default)

is low or high, the on/off status of
inverter output will not be effected.

Saving mode enable

If enabled, the output of inverter will
be off when connected load is pretty
low or not detected.

Battery type

AGM (default)

Flooded

User-Defined

If “User-Defined” is selected, battery
charge voltage and low DC cut-off
voltage can be set up in program 26,
27 and 29.

Restart disable
06

Auto restart when overload
occurs

Restart enable

(default)

Restart disable

Restart enable

Auto restart when over
temperature occurs

(default)

110V

120V (default)

Output voltage (only
available for 110/120Vac
models)

50Hz (default)

60Hz

Output frequency

Available options in 1KVA 12V/ 24V and 2KVA 24V Plus 120Vac
model:
10A
11

Maximum utility charging
current

20A(default):

Available options in 2-3KVA 24V and 2-3KVA 24V Plus models:
20A

30A (default)

Available options in 1KVA/3KVA 48V and 2-3KVA 48V Plus
models:
10A

15A(default):

Available options in 2KVA 48V Plus 120Vac model:
5A

10A(default)

Available options in 4KVA/5KVA models:
11

Maximum utility charging
current

10A

20A

30A (default)

40A

50A

60A

Available options in 12V model:

Setting voltage point back
to utility source when
selecting “SBU priority” or
“Solar first” in program 01.

11.0V

11.3V

11.5V (default)

11.8V

12.0V

12.3V

12.5V

12.8V

Available options in 24V models:
22.0V

22.5V

23.0V (default)

23.5V

24.0V

24.5V

25.0V

25.5V

Available options in 48V models:
44V

45V

46V (default)

47V

48V

49V

50V

51V

Below options only available for the model with 64VDC
maximum charging voltage

Setting voltage point back
to utility source when
selecting “SBU priority” or
“Solar first” in program 01.

52V

53V

54V

55V

Setting voltage point back
to utility source when
selecting “SBU priority” or
“Solar first” in program 01.

56V

57V

Available options in 12V model:

Setting voltage point back
to battery mode when
selecting “SBU priority” or
“Solar first” in program 01.

Battery fully charged

12.0V

12.3V

12.5V

12.8V

13.0V

13.3V

13.5V (default)

13.8V

14.0V

14.3V

14.5V

Available options in 24V models:
Battery fully charged

24V

24.5V

25V

25.5V

26V

26.5V

27V (default)

27.5V

28V

28.5V

29V

Available options in 48V models:

Battery fully charged

48V

49V

50V

51V

52V

53V

54V (default)

55V

56V

57V

58V

Setting voltage point back
to battery mode when
selecting “SBU priority” or
“Solar first” in program 01.

Below options only available for the model with 64VDC
maximum charging voltage
59V

60V

61V

62V

63V

64V

If this inverter/charger is working in Line, Standby or Fault
mode, charger source can be programmed as below:
Solar first

Solar energy will charge battery as
first priority.
Utility will charge battery only when
solar energy is not available.

Utility first

Utility will charge battery as first
priority.

Charger source priority:
To configure charger source
priority

Solar energy will charge battery only
when utility power is not available.
Solar and Utility

Solar energy and utility will charge
battery at the same time.

Only Solar

Solar energy will be the only charger
source no matter utility is available
or not.

If this inverter/charger is working in Battery mode or Power
saving mode, only solar energy can charge battery. Solar
energy will charge battery if it's available and sufficient.
18

Alarm on (default)

Alarm off

Return to default

If selected, no matter how users

display screen (default)

switch display screen, it will

Alarm control

automatically return to default
19

display screen (Input voltage

Auto return to default
display screen

/output voltage) after no button is
pressed for 1 minute.
Stay at latest screen

If selected, the display screen will
stay at latest screen user finally
switches.

Backlight control

Beeps while primary source
is interrupted

Overload bypass:
When enabled, the unit will
transfer to line mode if
overload occurs in battery
mode.

Backlight on (default)

Backlight off

Alarm on (default)

Alarm off

Bypass disable

Bypass enable

(default)

Record enable
25

Record Fault code

Record disable (default)

12V model default setting: 14.1V

24V model default setting: 28.2V

Bulk charging voltage
(C.V voltage)

48V model default setting: 56.4V

If self-defined is selected in program 5, this program can be
set up. Setting range is from 12.0V to 14.6V for 12V model,
24.0V to 29.2V for 24V model and 48.0V to 58.4V for 48V
model. For the model with 64V maximum charging voltage,
the setting range is from 48.0V to 64.0V. Increment of each
click is 0.1V.
12V model default setting: 13.5V

24V model default to 27.0V

Floating charging voltage

48V model default setting: 54.0V

If self-defined is selected in program 5, this program can be
set up. Setting range is from 12.0V to 14.6V for 12V model,
24.0V to 29.2V for 24V model, 48.0V to 58.4V for 48V model.
For the model with 64V maximum charging voltage, the
setting range is from 48.0V to 64.0V.
is 0.1V.
12V model default setting: 10.5V

24V model default setting: 21.0V
29

Low DC cut-off voltage

48V model default setting: 42.0V

Increment of each click

If self-defined is selected in program 5, this program can be
set up. Setting range is from 10.0V to 12.0V for 12V model,
20.0V to 24.0V for 24V model, 40.0V to 48.0V for 48V model.
For the model with 64V maximum charging voltage, the
setting range is from 40.0V to 54.0V.

Increment of each click

is 0.1V. Low DC cut-off voltage will be fixed to setting value no

Solar power balance:
When enabled, solar input
power will be automatically
adjusted according to
connected load power.
(Only available for
4KVA/5KVA model)

Bulk charging time
32

matter what percentage of load is connected.
If selected, solar input power will
Solar power balance
be automatically adjusted
enable (Default):
according to the following formula:
Max. input solar power = Max.
battery charging power +
Connected load power.
If selected, the solar input power
Solar power balance
will be the same to max. battery
disable:
charging power no matter how
much loads are connected. The
max. battery charging power will
be based on the setting current in
program 02.
(Max. solar power = Max. battery
charging power)
If selected, inverter will judge this
Automatically (Default):
charging time automatically.
The setting range is from 5 min to
900 min. Increment of each click is
5 min.

5 min

(C.V stage)
(Only available for
4KVA/5KVA model)

900 min

If “USE” is selected in program 05, this program can be set up.
Disable: Neutral and grounding of AC output is disconnected.
(Default)

Allow neutral and grounding
of AC output is connected
together:
When enabled, inverter can
deliver signal to trigger
grounding box to short
neutral and grounding

Enable: Neutral and grounding of AC output is connected.

This function is only available when the inverter is working
with external grounding box. Only when the inverter is
working in battery mode, it will trigger grounding box to
connect neutral and grounding of AC output.

Display Setting
The LCD display information will be switched in turns by pressing “UP” or “DOWN” key. The selectable
information is switched as below order: input voltage, input frequency, PV voltage, MPPT charging current,

MPPT charging power, battery voltage, output voltage, output frequency, load percentage, load in VA,
load in Watt, DC discharging current, main CPU Version and second CPU Version.
Selectable information

LCD display
Input Voltage=230V, output voltage=230V

Input voltage/Output voltage
(Default Display Screen)

Input frequency=50Hz

Input frequency

PV voltage=60V

PV voltage

Current ≧10A

MPPT Charging current

MPPT Charging power

Current < 10A

MPPT charging power=500W

Battery voltage=25.5V, discharging current=1A

Battery voltage/ DC discharging current

Output frequency=50Hz

Output frequency

Load percent=70%

Load percentage

When connected load is lower than 1kVA, load in
VA will present xxxVA like below chart.

Load in VA

When load is larger than 1kVA (≧1KVA), load in
VA will present x.xkVA like below chart.

When load is lower than 1kW, load in W will
present xxxW like below chart.

Load in Watt

When load is larger than 1kW (≧1KW), load in W
will present x.xkW like below chart.

Main CPU version 00014.04

Main CPU version checking

Secondary CPU version 00003.03

Secondary CPU version checking

Operating Mode Description
Operation mode

Description

LCD display
Charging by utility and PV energy.

Standby mode / Power
saving mode

Charging by utility.

Note:
*Standby mode: The inverter is
not turned on yet but at this

No output is supplied by the

time, the inverter can charge

unit but it still can charge

battery without AC output.

batteries.

Charging by PV energy.

*Power saving mode: If
enabled, the output of inverter
will be off when connected load
is pretty low or not detected.

No charging.

Charging by utility and PV energy.

Charging by utility. (Only available in 1K/2K/3K
model)

Fault mode
Note:
*Fault mode: Errors are caused
by inside circuit error or external
reasons such as over

PV energy and utility can
charge batteries.
Charging by PV energy.

temperature, output short
circuited and so on.

No charging.

Charging by PV energy
The unit will provide output
Line Mode

power from the mains. It will
also charge the battery at
line mode.
Charging by utility.
27

Power from battery and PV energy.

The unit will provide output
Battery Mode

power from battery and PV
power.

Power from battery only.

Fault Reference Code
Fault Code

Fault Event

Fan is locked when inverter is off.

Over temperature

Battery voltage is too high

Battery voltage is too low

05
06

Icon on

Output short circuited or over temperature is detected
by internal converter components.
Output voltage is abnormal. (For 1K/2K/3K model)
Output voltage is too high. (For 4K/5K model)

Overload time out

Bus voltage is too high

Bus soft start failed

Main relay failed

Over current or surge

Bus voltage is too low

Inverter soft start failed

Over DC voltage in AC output

Battery connection is open

Current sensor failed

Output voltage is too low

NOTE: Fault codes 51, 52, 53, 55, 56, 57 and 58 are only available in 4K/5K model.

Warning Indicator
Warning
Code

Warning Event

Audible Alarm

Fan is locked when
inverter is on.

Beep three times every
second

Battery is over-charged

Beep once every second

Low battery

Beep once every second

Overload

Beep once every 0.5 second

Output power derating

Beep twice every 3 seconds

12
13
14

Solar charger stops due
to low battery.
Solar charger stops due
to high PV voltage.
Solar charger stops due
to overload.

Icon flashing

EQUALIZATION

(Only available for 4KVA/5KVA model)

Equalization function is for refreshed battery capacity. It reverses the buildup of negative chemical
effects like stratification, a condition where acid concentration is greater at the bottom of the battery
than at the top. Equalization also helps to remove sulfate crystals that might have built up on the
plates. If left unchecked, this condition, called sulfation, will reduce the overall capacity of the battery.
Therefore, it’s recommended to equalize battery periodically.

How to Equalization
Users can equalize battery manually. Please follow below steps to set up battery equalization.
1. After pressing and holding ENTER button for 3 seconds, LCD will go to setting page.
2. Select program 01 and set it as “UTI”. The output priority will be utility first.

3. Select program 02 and set the equalization charging current you need for battery. Below screen is
to set up equalization current as 60A.

4. Select program 05 and set it as “USE”. It’s use-defined battery type.

5. Select program 16 and set it as “SNU”. Charging priority will be solar and utility together.

6. Select program 26 and set the bulk charging current you need for battery. It will be max.
charging voltage for equalization. Below screen is to set up max. charging voltage as 56.4V.

7. Select program 32 and set the charging time for C.V stage. It will be charging time for battery
equalization. Below screen is to set up charging time as 900 min.

After following above steps, PV power and utility will charge battery at setting max. charging voltage
in program 26 and keep charging for the period of setting in program 32 (equalization charging time).
After that, battery will be in floating charging stage. Once
LED lights on, it means battery is
fully charged and one equalization cycle is complete. At this time, please be sure to restore above
settings to previous setting for normal operation.

SPECIFICATIONS
Table 1 Line Mode Specifications
1KVA 12V

INVERTER MODEL

1KVA 24V

2KVA 24V Plus

2KVA 24V

3KVA 24V Plus

4KVA

3KVA 24V

2KVA 48V Plus

5KVA

1KVA 48V

3KVA 48V Plus

3KVA 48V
Input Voltage Waveform

Sinusoidal (utility or generator)

Nominal Input Voltage

110/120Vac or 230Vac
95Vac± 7V or 170Vac± 7V (UPS)

Low Loss Voltage

65Vac± 7V or 90Vac± 7V (Appliances)
100Vac± 7V or 180Vac± 7V (UPS);

Low Loss Return Voltage

70Vac± 7V or 100Vac± 7V (Appliances)

High Loss Voltage

140Vac± 7V or 280Vac± 7V

High Loss Return Voltage

135Vac± 7V or 270Vac± 7V

Max AC Input Voltage

150Vac or 300Vac

Nominal Input Frequency

50Hz / 60Hz (Auto detection)

Low Loss Frequency

40± 1Hz

Low Loss Return Frequency

42± 1Hz

High Loss Frequency

65± 1Hz

High Loss Return Frequency

63± 1Hz
Line mode: Circuit Breaker

Output Short Circuit Protection
Efficiency (Line Mode)

Battery mode: Electronic Circuits
>95% ( Rated R load, battery full charged )
10ms typical (UPS);

Transfer Time

20ms typical (Appliances)
110/120Vac model:
Output Power

Rated Power

50% Power

Output power derating:
When AC input voltage drops to 95V or
170V depending on models, the output

65V

95V

90V

170V

140V

Input Voltage

230Vac model:

power will be derated.

Output Power

Rated Power
50%
Power

280V Input Voltage

Table 2 Inverter Mode Specifications
1KVA 24V

1KVA 48V

2KVA 24V
INVERTER MODEL

1KVA 12V

3KVA 24V
2KVA 24V Plus
3KVA 24V Plus

Rated Output Power

3KVA 48V

4KVA

2KVA 48V Plus

5KVA

3KVA 48V Plus

1KVA/0.8KW
2KVA/1.6KW
3KVA/2.4KW

1KVA/0.8KW

1KVA/1KW
2KVA/1.6KW
3KVA/2.4KW

4KVA/3.2KW
5KVA/4KW

Output Voltage Waveform

Pure Sine Wave

Output Voltage Regulation

110/120VAC± 5%* or 230Vac± 5%

60Hz or 50Hz

Output Frequency

90%

Peak Efficiency
Overload Protection

5s@≥150% load; 10s@110%~150% load
2* rated power for 5 seconds

Surge Capacity
Nominal DC Input Voltage

12Vdc

24Vdc

48Vdc

11.5Vdc

23.0Vdc

46.0Vdc

@ load < 20%

11.0Vdc

22.0Vdc

44.0Vdc

@ 20% ≤ load < 50%

10.7Vdc

21.4Vdc

42.8Vdc

@ load ≥ 50%

10.1Vdc

20.2Vdc

40.4Vdc

@ load < 20%

11.5Vdc

23.0Vdc

46.0Vdc

@ 20% ≤ load < 50%

11.2Vdc

22.4Vdc

44.8Vdc

@ load ≥ 50%

10.6Vdc

21.2Vdc

42.4Vdc

@ load < 20%

10.5Vdc

21.0Vdc

42.0Vdc

@ 20% ≤ load < 50%

10.2Vdc

20.4Vdc

40.8Vdc

@ load ≥ 50%

9.6Vdc

19.2Vdc

38.4Vdc

High DC Recovery Voltage

14.5Vdc

29Vdc

58Vdc

58Vdc or 62Vdc

High DC Cut-off Voltage

15.5Vdc

31Vdc

62Vdc

60Vdc or 66Vdc

Cold Start Voltage
Low DC Warning Voltage

Low DC Warning Return Voltage

Low DC Cut-off Voltage

No Load Power Consumption

<15W

<25W

<50W

Saving Mode Power Consumption

<5W

<10W

<15W

*4KVA/5KVA only supports 230VAC system.

Table 3 Charge Mode Specifications
Utility Charging Mode
2KVA 24V

1KVA 24V

INVERTER MODEL

1KVA 12V

3KVA 24V

2KVA 24V

2KVA 24V Plus

Plus 120Vac

Plus
120Vac

3KVA 48V

4KVA

2KVA 48V Plus

5KVA

3KVA 48V Plus

2/10A/

Charging Current (UPS)

10/20A

@ Nominal Input Voltage
Flooded

3KVA 24V Plus

1KVA 48V

2KVA 48V

20/30A

5/10A

10/15A

40/50/60A
14.6

29.2

58.4

14.1

28.2

56.4

Floating Charging Voltage

13.5Vdc

27Vdc

54Vdc

Overcharge Protection

15.5Vdvc

31Vdc

60Vdc

Bulk
Charging
Voltage

Battery
AGM / Gel
Battery

20/30A/

Charging Algorithm

3-Step
Battery Voltage, per cell

Charging Current, %

2.43Vdc (2.35Vdc)

Voltage

2.25Vdc

100%

Charging Curve
50%

T1
T1 = 10* T0, minimum 10mins, maximum 8hrs

Current

Bulk
(Constant Current)

Absorption
(Constant Voltage)

Maintenance
(Floating)

Time

54Vdc or
64Vdc
66Vdc

Solar Charging Mode
1KVA 24V

INVERTER MODEL

1KVA 12V

2KVA 24V
3KVA 24V

Rated Power

500W

1KVA 48V 2KVA 24V Plus 2KVA 48V Plus

4KVA

3KVA 48V 3KVA 24V Plus 3KVA 48V Plus

5KVA

600W

900W

Efficiency

1500W

3000W

4000W

98.0% max.

Max. PV Array Open

102Vdc

Circuit Voltage
PV Array MPPT Voltage
Range

75Vdc

15~80Vdc

Min battery voltage for
PV charge

102Vdc

145Vdc

30~66Vdc 60~88Vdc

8.5Vdc

17Vdc

30~115Vdc

60~115Vdc

17Vdc

34Vdc

Standby Power

Consumption
Battery Voltage

+/-0.3%

Accuracy
PV Voltage Accuracy

+/-2V

Charging Algorithm

3-Step

Joint Utility and Solar Charging
Max Charging Current

1K: 45Amp
60Amp

2K/3K:

33Amp

90Amp

75Amp

140Amp

20Amp

60 Amp

60Amp

55Amp
Default Charging

1K: 20Amp

Current

40Amp

2K/3K:
30Amp

Table 4 General Specifications
1KVA 12V

2KVA 24V Plus

INVERTER

1KVA 12V

110Vac

2KVA

3KVA 24V

3KVA 24V Plus

4KVA

MODEL

230Vac

1KVA 24V

24V

3KVA 48V

2KVA 48V Plus

5KVA

1KVA 48V

3KVA 48V Plus

Safety

Certification
Operating
Temperature

0°C to 55°C

Range
Storage

-15°C~ 60°C

temperature
Humidity
Dimension

5% to 95% Relative Humidity (Non-condensing)
95 x 240 x

(D*W*H), mm

316

Net Weight, kg

5.2

100 x 272 x 355
6.8

7.0

140 x 295 x 479 120 x 295 x 468
7.4

11.5

TROUBLE SHOOTING
Problem
Unit shuts down
automatically
during startup
process.
No response after
power on.

Mains exist but the
unit works in
battery mode.

When the unit is
turned on, internal
relay is switched on
and off repeatedly.

LCD/LED/Buzzer

Explanation / Possible cause

LCD/LEDs and buzzer
will be active for 3
seconds and then
complete off.

The battery voltage is too low
(<1.91V/Cell)

1. Re-charge battery.
2. Replace battery.

No indication.

1. The battery voltage is far too
low. (<1.4V/Cell)
2. Battery polarity is connected
reversed.

1. Check if batteries and the
wiring are connected well.
2. Re-charge battery.
3. Replace battery.

Input voltage is
displayed as 0 on the
LCD and green LED is
flashing.

Input protector is tripped

Check if AC breaker is tripped
and AC wiring is connected
well.

Green LED is flashing.

Insufficient quality of AC power.
(Shore or Generator)

Green LED is flashing.

Set “Solar First” as the priority of
output source.

LCD display and LEDs
are flashing

Battery is disconnected.

Fault code 07

Overload error. The inverter is
overload 110% and time is up.
Output short circuited.

Fault code 05

1. Check if AC wires are too
thin and/or too long.
2. Check if generator (if
applied) is working well or if
input voltage range setting is
correct. (UPSAppliance)
Change output source priority
to Utility first.
Check if battery wires are
connected well.
Reduce the connected load by
switching off some
equipment.
Check if wiring is connected
well and remove abnormal
load.

Temperature of internal converter
component is over 120°C. (Only
available for 1-3KVA models.)
Internal temperature of inverter
component is over 100°C.

Check whether the air flow of
the unit is blocked or whether
the ambient temperature is
too high.

Battery is over-charged.

Return to repair center.

The battery voltage is too high.

Check if spec and quantity of
batteries are meet
requirements.

Fault code 01

Fan fault

Replace the fan.

Fault code 06/58

Output abnormal (Inverter voltage
below than 190Vac or is higher
than 260Vac)

1. Reduce the connected
load.
2. Return to repair center

Fault code
08/09/53/57

Internal components failed.

Return to repair center.

Fault code 51

Over current or surge.

Fault code 52

Bus voltage is too low.

Fault code 55

Output voltage is unbalanced.

Fault code 56

Battery is not connected well or
fuse is burnt.

Fault code 02

Buzzer beeps
continuously and
red LED is on.

What to do

Fault code 03

Restart the unit, if the error
happens again, please return
to repair center.
If the battery is connected
well, please return to repair
center.

Appendix: Approximate Back-up Time Table
Model

1KVA

Model

1KVA

2KVA

3KVA

Load (VA)

Backup Time @ 12Vdc 100Ah (min)

Backup Time @ 12Vdc 200Ah (min)

100

766

1610

200

335

766

300

198

503

400

139

339

500

112

269

600

227

700

176

800

140

900

125

1000

112

Load (VA)

Backup Time @24Vdc 100Ah (min)

Backup Time @24Vdc 200Ah (min)

200

766

1610

400

335

766

600

198

503

800

139

339

1000

112

269

200

766

1610

400

335

766

600

198

503

800

139

339

1000

112

269

1200

227

1400

176

1600

140

1800

125

2000

112

300

449

1100

600

222

525

900

124

303

1200

227

1500

164

1800

126

2100

108

2400

2700

3000

Model

1KVA

2KVA

3KVA

4KVA

Load (VA)

Backup Time @ 48Vdc 100Ah (min)

Backup Time @ 48Vdc 200Ah (min)

100

2529

5058

200

1264

2529

300

843

1686

400

608

1279

500

482

1035

600

406

872

700

310

710

800

268

615

900

231

540

1000

186

471

200

1581

3161

400

751

1581

600

491

1054

800

331

760

1000

268

615

1200

221

508

1400

172

387

1600

136

335

1800

120

295

2000

106

257

300

1054

2107

600

491

1054

900

291

668

1200

196

497

1500

159

402

1800

123

301

2100

105

253

2400

219

2700

174

3000

155

400

766

1610

800

335

766

1200

198

503

1600

139

339

2000

112

269

2400

227

2800

176

3200

140

3600

125

4000

112

Model

5KVA

Load (VA)

Backup Time @ 48Vdc 100Ah (min)

Backup Time @ 48Vdc 200Ah (min)

500

613

1288

1000

268

613

1500

158

402

2000

111

271

2500

215

3000

182

3500

141

4000

112

4500

100

5000

Note: Backup time depends on the quality of the battery, age of battery and type of battery.
Specifications of batteries may vary depending on different manufacturers.

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USER’S MANUAL User Axpert MKS PLUS 1KVA 2KVA 3KVA 4KVA 5KVA

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