Maxima 3KVA User manual

3KVA/5KVA
INVERTER / CHARGER
Version: 1.3
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
Installation........................................................................................................................................................4
Battery Connection ..........................................................................................................................................6
AC Input/Output Connection............................................................................................................................7
PV Connection.................................................................................................................................................9
Communication Connection...........................................................................................................................10
OPERATION .....................................................................................................................................................11
Power ON/OFF ..............................................................................................................................................11
Operation and Display Panel.........................................................................................................................11
LCD Display Icons .........................................................................................................................................12
LCD Setting....................................................................................................................................................14
Display Setting...............................................................................................................................................20
Operating Mode Description..........................................................................................................................21
Fault Reference Code....................................................................................................................................23
Warning Indicator...........................................................................................................................................23
Battery Equalization Description (Only available for 5KVA model)................................................................24
SPECIFICATIONS ...........................................................................................................................................26
TROUBLE SHOOTING.....................................................................................................................................29
Appendix I: Parallel function (Only for 5K parallel model) ...................................................................30
Appendix II: Approximate Back-up Time Table.......................................................................................44

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 (6 pieces of 40A, 32VDC for 3KVA and 1 piece of 200A, 58VDC for 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.

2
INTRODUCTION
This is a multi-function inverter/charger, combining functions of inverter, AVR, solar charger and battery
charger to offer uninterruptible power for office and home appliances. 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 solar charge controller
Built in boost and buck AVR for voltage regulation
Configurable 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

3
Product Overview
Wall-mounted Desktop
5K 3K
1. Operation panel
2. Output sockets
3. AC output terminal
4. AC input
5. Communication port
6. PV input
7. Battery input
8. Circuit breaker
9. Parallel connectors
(only available for parallel models)

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 2
Software CD x 1
Mounting plate x 1
Screws x 4
Installation
Wall mounted
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.
For proper air circulation to dissipate heat, allow a clearance of approx. 20 cm to the side and approx. 50
cm above and below the unit.
SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.
Please follow the steps as below to finish the installation.
Employ the mounting plate as a template for marking
the positions of the boreholes. Mount the mounting plate
with supplied screws to fix the plate in place.
Insert two screws to the two sides of inverter as showed
in the figure. Please don’t screw them tightly at this
time. Then, place the inverter onto the mounting plate
and fix two screws tightly.
Then, insert the other two screws on the two sides of
inverter as showed in the figure and fix them tightly.
For proper air circulation to dissipate heat, please keep
the space around the inverter more than 20 cm.

5
Desktop
The inverter can be switched to desktop form factor by following the below steps:
Take off the LCD panel by removing screws.
Remove the metal case showed in the figure.
Place the metal case to the position where the LCD
panel was previously removed and fix it with screws.
Place the LCD panel to the position where the metal
case was previously removed and fix it with two
screws.
Place the inverter in a protected area that is free of
excessive dust and has adequate air flow. Please
place the inverter away from other units at least 20
cm to avoid interference.

6
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 cable and terminal size:
Model
Typical
Amperage
Battery
capacity
Wire Size
Ring Terminal
Torque
value
Cable
mm2
Dimensions
D (mm)
L (mm)
3KVA
100A
100AH
200AH
1*4AWG
22
6.4
33.2
2~ 3 Nm
2*8AWG
14
6.4
29.2
5KVA
84A
200AH
1*4AWG
22
6.4
33.2
2~ 3 Nm
2*8AWG
14
6.4
29.2
Please follow below steps to implement battery connection:
1. Assemble battery ring terminal based on recommended battery cable and terminal size.
2. 3KVA model supports 24VDC system and 5KVA model supports 48VDC system. Connect all battery packs
as below chart. It’s suggested to connect at least 100Ah capacity battery for 3KVA model and at least
200Ah capacity battery for 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.
Ring terminal:

7
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 30A
for 3KVA 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!! When using sockets as the output, please make sure that the current of each socket is less than
10A, in case of electric hazard.
WARNING! All wiring must be performed by qualified person.
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
3KVA
12 AWG
1.2~ 1.6 Nm
5KVA
8 AWG
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 disconnect first.
2. Remove insulation sleeve 10mm for six conductors.
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)
3K 5K

8
WARNING:
Be sure that AC power source is disconnected before attempting to fix the wire 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)
3K 5K
5. Make sure the wires are securely connected.
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
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 as below.
Model
Typical Amperage
Cable Size
Torque
3KVA W/O MPPT
50A
8 AWG
1.4~1.6 Nm
3KVA With MPPT
40A
8 AWG
1.4~1.6 Nm
5KVA W/O MPPT
50A
8 AWG
1.4~1.6 Nm
5KVA With MPPT
80A
6 AWG
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 Charger
INVERTER MODEL
3KVA
W/O MPPT
3KVA
With MPPT
5KVA
W/O MPPT
5KVA
With MPPT
Max. PV Array Open Circuit Voltage
75VDC
100VDC
105VDC
145VDC
Recommended PV Array MPPT Voltage Range: Vmp*
30~32VDC
30~80VDC
60~72VDC
60~115VDC
Max. charging current
50A
40A
50A
80A
Note: * Vmp: panel max power point voltage.
The PV charging efficiency is maximized while PV system voltage is close to Best Vmp.
Maximum PV module numbers in Series: Vmpp of PV module * X pcs ≒Best Vmp of Inverter or Vmp
range
PV module numbers in Parallel: Max. charging current of inverter / Impp
Total PV module numbers = maximum PV module numbers in series * PV module numbers in
parallel
Take 5K W/O MPPT model inverter as an example to select proper PV module. After considering Voc of PV
module not exceed 105Vdc and max. Vmpp of PV module close to 60Vdc or within 56Vdc ~ 72Vdc, we can
choose PV module with below specification.
Maximum Power (Pmax)
260W
Max. PV module numbers in series
2 30.9 x 2 ≒56 ~ 72
Max. Power Voltage Vmpp(V)
30.9V
Max. Power Current Impp(A)
8.42A
PV module numbers in parallel
6 50 A / 8.42
Total PV module numbers
2 x 6 = 12
Open Circuit Voltage Voc(V)
37.7V
Short Circuit Current Isc(A)
8.89A
Maximum PV module numbers in Series: 2
PV module numbers in Parallel: 6
Total PV module numbers: 2 x 6 = 12
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.

10
3K 5K
3. Make sure the wires are securely connected.
Communication Connection
The inverter is equipped with communication port either RS-232 or USB. Please use supplied communication
cable to connect to inverter and PC. This communication port is also can be replaced with SNMP card. When
installing with SNMP card in the inverter, it will provide advanced communication and monitoring options.
After communication cable is connected well, 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.

11
OPERATION
Power ON/OFF
Once the unit has been properly installed and the batteries are connected well, simply press On/Off switch
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 LED indicators, three function keys and a LCD display, indicating the operating status and
input/output power information.
LED Indicators
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
SELECT
To go to next page or next selection
ENTER
To confirm the selection in setting mode or enter setting mode
LED indicators
Function keys
LCD display

12
LCD Display Icons
Icon
Function description
Input Source Information
Indicate input voltage, input frequency, PV voltage, battery voltage and PV
input power, charging power or setting value.
Output Information
Indicate output voltage, output frequency, setting program NO or fault code.
Indicate load percentage
Battery Information
Indicates battery level by 0-24%, 25-49%, 50-74% and 75-100% in battery
mode and charging status.
Indicates battery voltage is low.
In line mode, it will present battery capacity as below table when unit is charging.
Status
Battery voltage
LCD Display
Constant
Current mode /
Constant
Voltage mode
<2V/cell
4 bars will flash in turns.
2 ~ 2.083V/cell
25% bar will be on and the other three
bars will flash in turns.
2.083 ~ 2.167V/cell
Two bars will be on and the other two bars
will flash in turns.
> 2.167 V/cell
Three bars will be on and the leftmost 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
Load >50%
< 1.717V/cell
1.717V/cell ~ 1.8V/cell
1.8 ~ 1.883V/cell
> 1.883 V/cell

13
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 unit is 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 the load is supplied by utility power.
Indicates the load is supplied by battery or solar.
Indicates alarm or fault is happened.
Indicates the solar charger circuit is working.
Indicates the utility charger circuit is working.

14
LCD Setting
After pressing and holding ENTER button for 3 seconds, the unit will enter setting mode. Press “SCROLL”
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)
Available options in 3KVA model W/O MPPT:
20A
30A
40A
50A (default)
60A
70A
80A

15
02
Maximum charging current:
To configure total charging
current for solar and utility
chargers.
(Max. charging current =
utility charging current +
solar charging current)
Available options in 3KVA model With MPPT:
20A
30A
40A (default)
50A
60A
70A
Available options in 5K model
10A
20A
30A
40A
50A
60A (default)
70A
80A
90A
100A
110A
120A
130A
140A
03
AC input voltage range
Appliances (default)
If selected, the transfer time is within
20ms between battery mode and line
mode
UPS
If selected, the transfer time is within
10ms between battery mode and line
mode
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.
06
Auto restart when overload
occurs
Restart disable
(default)
Restart enable
07
Auto restart when over
temperature occurs
Restart disable
(default)
Restart enable

16
09
Output frequency
50Hz (default)
60Hz
11
Maximum utility charging
current
Available options in 3KVA model:
20A
30A (default)
Available options in 5KVA model:
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.
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
13
Setting voltage point back
to battery mode when
selecting “SBU priority” or
“Solar first” in program 01.
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

17
13
Setting voltage point back
to battery mode when
selecting “SBU priority” or
“Solar first” in program 01.
Available options in 48V models:
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
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

18
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)
24V model default setting: 28.2V
48V model default setting: 56.4V
If self-defined is selected in program 5, this program can be
set up. Setting range is from 24.0V to 29.2V for 24V model and
48.0V to 58.4V for 48V model. Increment of each click is 0.1V.
27
Floating charging voltage
24V model default to 27.0V
48V model default setting: 54.0V
If self-defined is selected in program 5, this program can be
set up. Setting range is from 24.0V to 29.2V for 24V model,
48.0V to 58.4V for 48V model. Increment of each click is 0.1V.
29
Low DC cut-off voltage
24V model default setting: 21.0V
48V model default setting: 42.0V
If self-defined is selected in program 5, this program can be
set up. Setting range is from 20.0V to 24.0V for 24V model,
40.0V to 48.0V for 48V model. 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.
31
Solar power balance:
When enabled, solar input
power will be automatically
adjusted according to
connected load power.
(Only available for 5KVA
model)
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)
32
Bulk charging time
(C.V stage)
(Only available for 5KVA
model)
Automatically (Default):
If selected, inverter will judge this
charging time automatically.
5 min
The setting range is from 5 min to
900 min. Increment of each click is
5 min.