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.