Voltronic Power Axpert Plus Duo User manual

INVERTER/CHARGER
5KVA with MPPT solar charger
Version: 1.0
User Manual

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 ....................................................................................................................9
Dry Contact Signal.................................................................................................................................9
OPERATION................................................................................................................................... 10
Power ON/OFF ....................................................................................................................................10
Operation and Display Panel.................................................................................................................10
LCD Display Icons................................................................................................................................11
LCD Setting.........................................................................................................................................13
Display Setting ....................................................................................................................................18
Operating Mode Description .................................................................................................................22
Fault Reference Code...........................................................................................................................24
Warning Indicator................................................................................................................................24
SPECIFICATIONS .......................................................................................................................... 25
Table 1 Line Mode Specifications ..........................................................................................................25
Table 2 Inverter Mode Specifications.....................................................................................................26
Table 3 Charge Mode Specifications ......................................................................................................27
TROUBLE SHOOTING .................................................................................................................... 29
Appendix I: Approximate Back-up Time Table ............................................................................. 30
Appendix II: Parallel function (Only for parallel model) .............................................................. 31

1
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.
2. 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.
3. 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.
4. To reduce risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning.
Turning off the unit will not reduce this risk.
5. CAUTION –Only qualified personnel can install this device with battery.
6. NEVER charge a frozen battery.
7. 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.
8. 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.
9. 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 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.

2
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
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

3
Product Overview
Single Model 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 (Please check model no for detailed PV input numbers )
10. Battery input
11. Circuit breaker
12. RS232 communication port
13. Parallel communication cable (only for parallel model)
14. Current sharing cable (only for parallel model)
15. Dry contact
16. USB communication port
NOTE: For parallel model installation and operation,
please check separate parallel installation guide for
the details.

4
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.

5
Install the unit by screwing three screws. It’s recommended to use M5 screws.
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.
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 breaker, cable and terminal size:
Model
Breaker
Size
Wire Size
Ring Terminal
Torque
Value
Dimensions
AWG
mm2
D (mm)
L (mm)
5KVA with 2 MPPTs
200A/60VDC
2 * 4AWG
44
10.5
50
10~ 12 Nm
5KVA with 3 MPPTs
250A/60VDC
2 * 2AWG
72
10.5
55
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 the unit requires. It’s suggested to connect at least 600Ah capacity battery.
3. Insert the ring terminal of battery cable flatly into battery connector of inverter and make sure the bolts are
tightened with torque of 10-12 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.
Ring terminal:

6
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
(-).

7
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 50A.
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
Wire Size
Torque Value
AWG
mm2
5KVA
1 * 8 AWG
8.4
1.4~ 1.6Nm
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)

8
5. Make sure the wires are securely connected.
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's 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 for each PV input as
below.
Note! Each PV input connection is independent. Please connect to PV modules separately.
Note! If users only use one PV input, please choose one from PV1 or PV2 input.
Model
Breaker size
Wire Size
Torque
AWG
mm2
5KVA
60A/150VDC
1 * 8 AWG
8.4
1.4~1.6 Nm
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
INVERTER MODEL
5KVA
Max. PV Array Open Circuit Voltage
145Vdc
PV Array MPPT Voltage Range
60~115Vdc
Min. battery voltage for PV charge
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.
Only for the model with 3 MPPTs
3. 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.

9
Final Assembly
After connecting all wirings, please put bottom cover back by screwing two screws as shown below.
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. It could be used to deliver signal to external
device when battery voltage reaches warning level.
Unit Status
Condition
Dry contact port:
NC & C
NO & C
Power Off
Unit is off and no output is powered.
Close
Open
Power On
Output is powered from Utility.
Close
Open
Output is
powered
from
Battery or
Solar.
Program 01
set as Utility
Battery voltage < Low DC warning
voltage
Open
Close
Battery voltage > Setting value in
Program 13 or battery charging
reaches floating stage
Close
Open
Program 01
is set as
SBU or
Solar first
Battery voltage < Setting value in
Program 12
Open
Close
Battery voltage > Setting value in
Program 13 or battery charging
reaches floating stage
Close
Open

10
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.
LED Indicator
LED Indicator
Messages
Green
Solid On
Output is powered by utility in Line mode.
Flashing
Output is powered by battery or PV in battery mode.
Green
Solid On
Battery is fully charged.
Flashing
Battery is charging.
Red
Solid On
Fault occurs in the inverter.
Flashing
Warning condition occurs in the inverter.
Function Keys
Function Key
Description
ESC
To exit setting mode
UP
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
LED indicators
Function keys

11
LCD Display Icons
Icon
Function description
Input Source Information
Indicates the AC input.
Indicates the PV1 input
Indicates the PV2 input
Indicates the PV3 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: flashing with warning code.
Fault: 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
LCD Display
Constant
Current mode /
Constant
Voltage mode
<2V/cell
4 bars will flash in turns.
2 ~ 2.083V/cell
Bottom bar will be on and the other three
bars will flash in turns.
2.083 ~ 2.167V/cell
Bottom two bars will be on and the other
two bars will flash in turns.
> 2.167 V/cell
Bottom three bars will be on and the top
bar will flash.
Floating mode. Batteries are fully charged.
4 bars will be on.

12
In battery mode, it will present battery capacity.
Load Percentage
Battery Voltage
LCD Display
Load >50%
< 1.717V/cell
1.717V/cell ~ 1.8V/cell
1.8 ~ 1.883V/cell
> 1.883 V/cell
50%> Load > 20%
< 1.817V/cell
1.817V/cell ~ 1.9V/cell
1.9 ~ 1.983V/cell
> 1.983
Load < 20%
< 1.867V/cell
1.867V/cell ~ 1.95V/cell
1.95 ~ 2.033V/cell
> 2.033
Load Information
Indicates overload.
Indicates the load level by 0-24%, 25-50%, 50-74% and 75-100%.
0%~25%
25%~50%
50%~75%
75%~100%
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.

13
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
00
Exit setting mode
Escape
01
Output source priority:
To configure load power
source priority
Solar first
Solar energy provides power to the
loads as first priority.
If solar energy is not sufficient to
power all connected loads, battery
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.
Utility first (default)
Utility will provide power to the loads
as first priority.
Solar and battery energy will provide
power to the loads only when utility
power is not available.
SBU priority
Solar energy provides power to the
loads as first priority.
If solar energy is not sufficient to
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.
02
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
50A
60A (default)

14
70A
80A
90A
100A
110A
120A
130A
140A
150A
160A
170A
180A
190A
200A
210A
220A
230A
240A
03
AC input voltage range
Appliances (default)
If selected, acceptable AC input
voltage range will be within
90-280VAC.
UPS
If selected, acceptable AC input
voltage range will be within
170-280VAC.
04
Power saving mode
enable/disable
Saving mode disable
(default)
If disabled, no matter connected load
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.
05
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.

15
06
Auto restart when overload
occurs
Restart disable
(default)
Restart enable
07
Auto restart when over
temperature occurs
Restart disable
(default)
Restart enable
08
Output voltage
220V
230V (default)
240V
09
Output frequency
50Hz (default)
60Hz
11
Maximum utility charging
current
2A
10A
20A
30A (default)
40A
50A
60A
12
Setting voltage point back
to utility source when
selecting “SBU priority” or
“Solar first” in program 01.
44V
45V
46V (default)
47V
48V
49V
50V
51V

16
13
Setting voltage point back
to battery mode when
selecting “SBU priority” or
“Solar first” in program 01.
Battery fully charged
48V
49V
50V
51V
52V
53V
54V (default)
55V
56V
57V
58V
16
Charger source priority:
To configure charger source
priority
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.
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 control
Alarm on (default)
Alarm off

17
19
Auto return to default
display screen
Return to default
display screen
(default)
If selected, no matter how users
switch display screen, it will
automatically return to default display
screen (Input voltage /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.
20
Backlight control
Backlight on
(default)
Backlight off
22
Beeps while primary source
is interrupted
Alarm on (default)
Alarm off
23
Overload bypass:
When enabled, the unit will
transfer to line mode if
overload occurs in battery
mode.
Bypass disable
(default)
Bypass enable
25
Record Fault code
Record enable
Record disable (default)
26
Bulk charging voltage
(C.V voltage)
56.4V (default)
If self-defined is selected in program 5, this program can be
set up. Setting range is from 48.0V to 58.4V. Increment of
each click is 0.1V.
27
Floating charging voltage
54.0V (default)
If self-defined is selected in program 5, this program can be
set up. Setting range is from 48.0V to 58.4V. Increment of
each click is 0.1V.
29
Low DC cut-off voltage
42.0V (default)
If self-defined is selected in program 5, this program can be
set up. Setting range is from 40.0V to 48.0V. Increment of
each click is 0.1V. Low DC cut-off voltage will be fixed to
setting value no matter what percentage of load is connected.

18
31
Solar power balance:
When enabled, solar input
power will be automatically
adjusted according to
connected load power.
Solar power balance
enable (Default):
If selected, solar input power will
be automatically adjusted
according to the following formula:
Max. input solar power = Max.
battery charging power +
Connected load power.
Solar power balance
disable:
If selected, the solar input power
will be the same to max. battery
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)
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, PV1 voltage, PV2 voltage, PV3 voltage,
charging current, total PV charging power, PV1 charging power, PV2 charging power, PV3 charging power,
battery voltage, output voltage, output frequency, load percentage, load in VA, load in Watt, DC discharging
current, main CPU Version, second CPU Version, third CPU version and fourth CPU version.
Selectable information
LCD display
Input voltage/Output voltage
(Default Display Screen)
Input Voltage=230V, output voltage=230V
Input frequency
Input frequency=50Hz
PV1 voltage
PV1 voltage=60V
PV2 voltage
PV2 voltage=60V