InvertFlex User Manual ver 2.0

User Manual

InvertFlex 1K/2K/3K/5K

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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... .................................................................................................................................... 9

Final Assembly .................................................................................................................................... 10

Communication Connection .................................................................................................................. 11

Dry Contact Signal ............................................................................................................................... 11

OPERATION ................................................................................................................................... 12

Power ON/OFF .................................................................................................................................... 12

Operation and Display Panel ................................................................................................................. 12

LCD Display Icons ................................................................................................................................ 13

LCD Setting ......................................................................................................................................... 15

Display Setting .................................................................................................................................... 23

Operating Mode Description ................................................................................................................. 25

Fault Reference Code ........................................................................................................................... 27

Warning Indicator ................................................................................................................................ 27

SPECIFICATIONS .......................................................................................................................... 28

Table 1 Line Mode Specifications .......................................................................................................... 28

Table 2 Inverter Mode Specifications..................................................................................................... 29

Table 3 Charge Mode Specifications ...................................................................................................... 30

Table 4 General Specifications .............................................................................................................. 30

TROUBLE SHOOTING .................................................................................................................... 31

Appendix: Approximate Back-up Time Table ................................................................................ 32

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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 (4 pieces of 40A, 32VDC for 1KVA/2KVA, 6 pieces of 40A, 32VDC for 3KVA, 1 piece of 200A,

64VDC 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.

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INTRODUCTION

This is a multi-function inverter/charger, combining functions of inverter, 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

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 kind of appliances at home or office environment, including motor-type appliances such as tube light, fan, refrigerator and air conditioner.

Figure 1 Hybrid Power System

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Product Overview

InvertFlex 5K single mode

InvertFlex 1K

InvertFlex 2K/3K

NOTE: For parallel model installation and operation, please check separate parallel installation guide for the details.

InvertFlex 5K 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

10. Battery input

11. Circuit breaker

12. RS232 communication port

13. Parallel communication cable (only for InvertFlex 5K)

14. Current sharing cable (only for InvertFlex 5K)

15. Dry contact

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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.

 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.

 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 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.

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Install the unit by screwing three 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.

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

Amperage

Battery capacity

Wire Size Cable mm

2

Ring Terminal

Dimensions

D (mm) L (mm)

14 6.4 29.2

Torque value

InvertFlex

1K/2K

66A 100AH

1*6AWG

8

22

6.4

6.4

23.8

33.2

2~ 3 Nm

InvertFlex

3K

100A

100AH

200AH

2*10AWG

1*4AWG

2~ 3 Nm

2*8AWG 14 6.4 29.2

InvertFlex

5K

84A 200AH

1*4AWG

2*8AWG

22

14

6.4

6.4

33.2

29.2 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. InvertFlex 1K model supports 12VDC system, InvertFlex 2K/3Kmodel supports 24VDC system and

InvertFlex 5K model supports 48VDC system. Connect all battery packs as below chart. It’s suggested to connect at least 100Ah capacity battery for 1-3KVA model and at least 200Ah capacity battery for

InvertFlex 5K model.

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NOTE: Please only use sealed lead acid battery or sealed GEL/AGM lead-acid 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 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

(-).

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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 InvertFlex 1K, 20A for InvertFlex 2K, 32A for InvertFlex 3K , 50A for InvertFlex 5K.

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

InvertFlex 1K 16 AWG 0.5~ 0.6 Nm

InvertFlex 2K

InvertFlex 3K

14 AWG

12 AWG

0.8~ 1.0 Nm

1.2~ 1.6 Nm

InvertFlex 5K 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 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)

InvertFlex 1K

InvertFlex 2K/3K/5K

WARNING:

Be sure that AC power source is disconnected before attempting to hardwire it to the unit.

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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)

InvertFlex 1K

InvertFlex 2K/3K/5K

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.

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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.

Typical Amperage Gauge Torque Value

50A 8 AWG 1.4~1.6 Nm

PV Module Selection:

When selecting proper PV modules, please be sure to consider below requirements first:

1. Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.

InvertFlex InvertFlex InvertFlex InvertFlex

INVERTER MODEL

1K 2K 3K 5K

Solar Charger

Charging Current (PWM)

System DC Voltage

12Vdc 24Vdc

50Amp

48Vdc

Operating Voltage Range

15~18Vdc 30~32Vdc 60~72vdc

Max. PV Array Open Circuit Voltage

40Vdc 60Vdc 105Vdc

2. Max. Power Voltage (Vmpp) of PV modules should be close to best Vmp of inverter or within Vmp range to get best performance. If one PV module can not meet this requirement, it’s necessary to have several PV modules in series connection. Refer to below table.

Model Best Vmp Vmp range

InvertFlex 1K 15Vdc 15V~18V

InvertFlex 2K/3K

InvertFlex 5K

30Vdc

60Vdc

30V~32V

56V~72V

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 1KVA inverter as an example to select proper PV modules. After considering Voc of PV module not exceeds

40Vdc and max. Vmpp of PV module close to 15Vdc or within 13Vdc ~ 18Vdc, we can choose PV module with below specification.

Maximum Power (Pmax) 85W

Max. Power Voltage Vmpp(V) 17.6V

Max. PV module numbers in series

1  17.6 x 1 ≒ 15 ~ 18

Max. Power Current Impp(A) 4.83A

Open Circuit Voltage Voc(V)

Short Circuit Current Isc(A)

21.6V

5.03A

PV module numbers in parallel

10  50 A / 4.83

Total PV module numbers

1 x 10 = 10

Maximum PV module numbers in Series: 1

PV module numbers in Parallel: 10

Total PV module numbers: 1 x 10 = 10

Take InvertFlex 2K/InvertFlex 3K inverter as an example to select proper PV module. After considering Voc of PV module not exceed 60Vdc and max. Vmpp of PV module close to 30Vdc or within 30Vdc ~ 32Vdc, we can choose PV module with below specification.

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Maximum Power (Pmax) 260W

Max. Power Voltage Vmpp(V) 30.9V

Max. Power Current Impp(A) 8.42A

Max. PV module numbers in series

1  30.9 x 1 ≒ 30 ~ 32

PV module numbers in parallel

6  50 A / 8.42

Open Circuit Voltage Voc(V) 37.7V

Short Circuit Current Isc(A)

Maximum Power (Pmax)

8.89A

260W

Max. Power Voltage Vmpp(V) 30.9V

Total PV module numbers

1 x 6 = 6

Maximum PV module numbers in Series: 1

PV module numbers in Parallel: 6

Total PV module numbers: 1 x 6 = 6

Take InvertFlex 5K 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.

Max. PV module numbers in series

2  30.9 x 2 ≒ 56 ~ 72

Max. Power Current Impp(A) 8.42A

Open Circuit Voltage Voc(V)

Short Circuit Current Isc(A)

37.7V

8.89A

PV module numbers in parallel

6  50 A / 8.42

Total PV module numbers

2 x 6 = 12

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.

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.

InvertFlex 1K/2K/3K InvertFlex 5K

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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

Power Off

Power On

Condition

Unit is off and no output is powered.

Output is powered from Utility.

Output is powered from Battery or Solar.

Program 01 set as Utility

Battery voltage < Low DC warning voltage

Battery voltage > Setting value in Program 13 or battery charging reaches floating stage

Program 01 is set as SBU or

Solar first

Battery voltage < Setting value in Program 12

Battery voltage > Setting value in Program 13 or battery charging reaches floating stage

Dry contact port:

NC & C

Close

Close

NO & C

Open

Open

Open

Close

Open

Close

Close

Open

Close

Open

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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

UP

DOWN

ENTER

To exit setting mode

To go to previous selection

To go to next selection

To confirm the selection in setting mode or enter setting mode

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LCD Display Icons

Icon

Input Source Information

Indicates the AC input.

Indicates the PV input

Function description

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:

Output Information

lighting with fault code

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

Current mode /

Constant

Voltage mode

2 ~ 2.083V/cell

2.083 ~ 2.167V/cell

> 2.167 V/cell

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 bar will flash.

Floating mode. Batteries are fully charged. 4 bars will be on.

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In battery mode, it will present battery capacity.

Load Percentage Battery Voltage

< 1.717V/cell

LCD Display

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%, 25-50%, 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.

Mute Operation

Indicates the DC/AC inverter circuit is working.

Indicates unit alarm is disabled.

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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

00 Exit setting mode

01

02

Output source priority:

To configure load power source priority

Maximum charging current:

To configure total charging current for solar and utility chargers.

(Max. charging current = utility charging current + solar charging current)

Solar first

Utility first (default)

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 low-level warning voltage or the setting point in program 12.

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.

Available options only for InvertFlex 1K/2K/3K model

10A (Only available for 1K model)

20A

30A 40A

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03

04

05

06

07

09

50A (default)

Available options only for InvertFlex 5K model

60A 70A

80A 90A

100A 110A

AC input voltage range

Power saving mode enable/disable

Appliances (default) If selected, acceptable AC input

UPS voltage range will be within

90-280VAC.

If selected, acceptable AC input

Saving mode disable

(default) voltage range will be within

170-280VAC.

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

AGM (default) low or not detected.

Flooded

Battery type

User-Defined

Auto restart when overload occurs

Restart disable

(default)

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 enable

Auto restart when over temperature occurs

Restart disable

(default)

Restart enable

50Hz (default) 60Hz

Output frequency

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11

Available options in InvertFlex 1K model:

10A 20A (default)

Available options in InvertFlex 2K/3K model:

20A 30A (default)

Maximum utility charging current

Note: If setting value in program 02 is smaller than that in program in 11, the inverter will apply charging current from program 02 for utility charger.

Available options in 5K model:

2A

20A

10A

30A (default)

40A 50A

60A

Available options in InvertFlex 1K model:

11.0V 11.3V

12

12.0V

12.3V

Setting voltage point back to utility source when selecting “SBU priority” or

“Solar first” in program 01.

12.5V 12.8V

Available options in InvertFlex 2K/3K model:

22.0V 22.5V

23.0V (default) 23.5V

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24.0V 24.5V

25.0V 25.5V

Available options in InvertFlex 5K model:

44V 45V

46V (default) 47V

48V 49V

13

Setting voltage point back to battery mode when selecting “SBU priority” or

“Solar first” in program 01.

50V 51V

Available options in InvertFlex 1K model:

Battery fully charged 12.0V

12.3V 12.5V

12.8V

13.3V

13.0V

13.5V (default)

13.8V 14.0V

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Setting voltage point back to battery mode when selecting “SBU priority” or

“Solar first” in program 01.

14.3V

Available options in InvertFlex 2K/3K model:

Battery fully charged 24V

24.5V

25.5V

26.5V

25V

26V

27V (default)

27.5V

28.5V

14.5V

28V

29V

Available options in InvertFlex 5K model:

Battery fully charged 48V

49V 50V

51V 52V

53V 54V (default)

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55V 56V

58V 57V

16

18

19

20

22

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

Solar and Utility

(default)

Utility will charge battery as first priority.

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

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.

Alarm on (default) Alarm off

Alarm control

Auto return to default display screen

Backlight control

Beeps while primary source is interrupted

Return to default display screen

(default)

Stay at latest screen

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.

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

Backlight on

(default)

Backlight off

Alarm on (default) Alarm off

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23

25

Overload bypass:

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

Bypass disable

(default)

Bypass enable

Record enable Record disable (default)

Record Fault code

1KVA default setting: 14.1V

2K/3KVA default setting: 28.2V

26

Bulk charging voltage

(C.V voltage)

5KVA 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

InvertFlex 1K model, 24.0V to 29.2V for InvertFlex 2K/3K model and 48.0V to 58.4V for InvertFlex 5K model.

Increment of each click is 0.1V.

1KVA default setting: 13.5V

2K/3KVA default setting: 27.0V

27 Floating charging voltage

5KVA 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

InvertFlex 1K model, 24.0V to 29.2V for InvertFlex 2K/3K model and 48.0V to 58.4V for InvertFlex 5K model.

Increment of each click is 0.1V.

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1KVA default setting: 10.5V

2K/3KVA default setting: 21.0V

29

31

5KVA default setting: 42.0V

Low DC cut-off voltage

Solar power balance:

When enabled, solar input power will be automatically adjusted according to connected load power.

(Only available for

InvertFlex 5KVA model)

If self-defined is selected in program 5, this program can be set up. Setting range is from 10.0V to 12.0V for

InvertFlex 1K model, 20.0V to 24.0V for InvertFlex 2K/3K model and 40.0V to 48.0V for InvertFlex 5K 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.

Solar power balance enable (Default):

Solar power balance disable:

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.

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)

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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, charging current, battery voltage, output voltage, output frequency, load percentage, load in Watt, 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

Charging current=50A

Charging current

Battery voltage=25.5V, discharging current=1A

Battery voltage/ DC discharging current

Output frequency=50Hz

Output frequency

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Load percentage

Load in VA

Load in Watt

Main CPU version checking

Load percent=70%

When connected load is lower than

InvertFlex 1k, load in VA will present xxxVA like below chart.

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.

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

Main CPU version 00014.04

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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

Note:

*Standby mode: The inverter is not turned on yet but at this time, the inverter can charge battery without AC output.

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

No output is supplied by the unit but it still can charge batteries.

Charging by utility.

Charging by PV energy.

No charging.

Charging by utility and PV energy. (Only available in InvertFlex 1K/2K/3K model)

Fault mode

Note:

*Fault mode: Errors are caused by inside circuit error or external reasons such as over temperature, output short circuited and so on.

PV energy and utility can charge batteries.

Charging by utility. (Only available in

InvertFlex 1K/2K/3K model)

Charging by PV energy.

25 for more information please visit www.flexston.com

Operation mode Description LCD display

No charging.

Fault mode

Note:

*Fault mode: Errors are caused by inside circuit error or external reasons such as over temperature, output short circuited and so on.

PV energy and utility can charge batteries.

Utility can power loads when the unit starts up without battery. (Only available

InvertFlex 5K model with single operation)

Power from utility

Charging by utility and PV energy.

Line Mode

Battery Mode

The unit will provide output power from the mains. It will also charge the battery at line mode.

Charging by utility.

Power from battery and PV energy.

The unit will provide output power from battery and PV power.

Power from battery only.

26 for more information please visit www.flexston.com

Fault Reference Code

Fault Code

01

Fault Event

Fan is locked when inverter is off.

Icon on

02 Over temperature

03 Battery voltage is too high

04

05

06

Battery voltage is too low

Output short circuited or over temperature is detected by internal converter components.

Output voltage is abnormal. (For InvertFlex 1K/2K/3K model)

Output voltage is too high. InvertFlex(5K model)

Overload time out 07

08 Bus voltage is too high

09 Bus soft start failed

11 Main relay failed

51 Over current or surge

52 Bus voltage is too low

53 Inverter soft start failed

55 Over DC voltage in AC output

56 Battery connection is open

57 Current sensor failed

58 Output voltage is too low

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

Warning Indicator

Warning

Code

Warning Event

01

Fan is locked when inverter is on.

Audible Alarm

Beep three times every second

Icon flashing

03 Battery is over-charged Beep once every second

04 Low battery Beep once every second

07 Overload Beep once every 0.5 second

10 Output power derating Beep twice every 3 seconds

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SPECIFICATIONS

Table 1 Line Mode Specifications

INVERTER MODEL

Input Voltage Waveform

Nominal Input Voltage

Low Loss Voltage

Low Loss Return Voltage

High Loss Voltage

High Loss Return Voltage

Max AC Input Voltage

Nominal Input Frequency

Low Loss Frequency

Low Loss Return Frequency

High Loss Frequency

High Loss Return Frequency

Output Short Circuit Protection

Efficiency (Line Mode)

Transfer Time

InvertFlex

1K

InvertFlex

2K

InvertFlex

3K

Sinusoidal (utility or generator)

InvertFlex

5K

230Vac

170Vac±7V (UPS);

90Vac±7V (Appliances)

180Vac±7V (UPS);

100Vac±7V (Appliances)

280Vac±7V

270Vac±7V

300Vac

50Hz / 60Hz (Auto detection)

40±1Hz

42±1Hz

65±1Hz

63±1Hz

Circuit Breaker

>95% ( Rated R load, battery full charged )

10ms typical (UPS);

20ms typical (Appliances)

Output Power

Output power derating:

When AC input voltage drops to 170V, the output power will be derated.

Rated Power

50% Power

90V 170V

280V

Input Voltage

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Table 2 Inverter Mode Specifications

INVERTER MODEL

Rated Output Power

1K 2K

InvertFlex

3K

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

Output Voltage Waveform

Pure Sine Wave

Output Voltage Regulation

230Vac±5%

Output Frequency

Peak Efficiency

Overload Protection

Surge Capacity

Nominal DC Input Voltage

Cold Start Voltage

Low DC Warning Voltage

@ load < 20%

@ 20% ≤ load < 50%

@ load ≥ 50%

Low DC Warning Return Voltage

@ load < 20%

@ 20% ≤ load < 50%

@ load ≥ 50%

Low DC Cut-off Voltage

@ load < 20%

@ 20% ≤ load < 50%

@ load ≥ 50%

High DC Recovery Voltage

High DC Cut-off Voltage

No Load Power Consumption

Saving Mode Power Consumption

InvertFlex

5K

5KVA/4KW

12Vdc

11.5Vdc

11.0Vdc

10.7Vdc

10.1Vdc

11.5Vdc

11.2Vdc

10.6Vdc

10.5Vdc

10.2Vdc

9.6Vdc

14.5Vdc

15.5Vdc

<15W

<5W

24Vdc

23.0Vdc

22.0Vdc

21.4Vdc

20.2Vdc

23.0Vdc

22.4Vdc

21.2Vdc

21.0Vdc

20.4Vdc

19.2Vdc

29Vdc

31Vdc

<20W

<10W

50Hz

90%

[email protected]≥150% load; [email protected]%~150% load

2* rated power for 5 seconds

48Vdc

46.0Vdc

44.0Vdc

42.8Vdc

40.4Vdc

46.0Vdc

44.8Vdc

42.4Vdc

42.0Vdc

40.8Vdc

38.4Vdc

58Vdc

60Vdc

<50W

<15W

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Table 3 Charge Mode Specifications

INVERTER MODEL

InvertFlex

1K

Charging Algorithm

Utility Charging Mode

AC Charging Current

InvertFlex

2K

InvertFlex

3K

3-Step

InvertFlex

5K

10/20Amp 20/30Amp (@V

I/P

=230Vac)

14.6 29.2

2/10/20/30/40/50/

60Amp (@V

I/P

=230Vac)

58.4

Bulk Charging

Voltage

Flooded Battery

AGM / Gel

Battery

Floating Charging Voltage

14.1

13.5Vdc

Battery Voltage, per cell

28.2

27Vdc

56.4

54Vdc

Charging Current, %

2.43Vdc (2.35Vdc)

2.25Vdc

Voltage

100%

Charging Curve

50%

T0 T1

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

Current

48Vdc

60~72vdc

105Vdc

InvertFlex

5K

110Amp

50Amp

InvertFlex

5K

9.8

Time

Solar Charging Mode

Charging Current (PWM)

System DC Voltage

Operating Voltage Range

Max. PV Array Open Circuit Voltage

Standby Power Consumption

DC Voltage Accuracy

Joint Utility and Solar Charging

12Vdc

15~18Vdc

40Vdc

1W

INVERTER MODEL

InvertFlex

1K

Max Charging Current

Default Charging Current

Table 4 General Specifications

INVERTER MODEL

InvertFlex

1K

Safety Certification

Operating Temperature Range

Storage temperature

Dimension (D*W*H), mm

Net Weight, kg

95 x 240 x

316

5.0

Bulk

(Constant Current)

Absorption

(Constant Voltage)

InvertFlex

2K

50Amp

50Amp

50Amp

24Vdc

30~32Vdc

60Vdc

+/-0.3%

2W

Invert Flex

3K

InvertFlex

2K

Invert Flex

3K

CE

0°C to 55°C

-15°C~ 60°C

100 x 272 x 355

6.4 6.9

Maintenance

(Floating)

120 x 295 x 468

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TROUBLE SHOOTING

Problem

Unit shuts down automatically during startup process.

No response after power on.

Mains exist but the unit works in battery mode.

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)

No indication.

1. The battery voltage is far too low. (<1.4V/Cell)

2. Battery polarity is connected reversed.

Input voltage is displayed as 0 on the

LCD and green LED is flashing.

Input protector is tripped

Green LED is flashing.

Insufficient quality of AC power.

(Shore or Generator)

What to do

1. Re-charge battery.

2. Replace battery.

1. Check if batteries and the wiring are connected well.

2. Re-charge battery.

3. Replace battery.

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

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.

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

LCD display and LEDs are flashing

Battery is disconnected.

Buzzer beeps continuously and red LED is on.

Fault code 07

Fault code 05

Fault code 02

Fault code 03

Fault code 01

Fault code 06/58

Check if battery wires are connected well.

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

Output short circuited.

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

Internal temperature of inverter component is over 100°C.

Battery is over-charged.

Reduce the connected load by switching off some equipment.

Check if wiring is connected well and remove abnormal load.

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

The battery voltage is too high.

Fan fault

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

Internal components failed.

Return to repair center.

Check if spec and quantity of batteries are meet requirements.

Replace the fan.

1. Reduce the connected load.

2. Return to repair center

Return to repair center.

Fault code

08/09/53/57

Fault code 51

Fault code 52

Fault code 55

Over current or surge.

Bus voltage is too low.

Output voltage is unbalanced.

Restart the unit, if the error happens again, please return to repair center.

Fault code 56

Battery is not connected well or fuse is burnt.

If the battery is connected well, please return to repair center.

31 for more information please visit www.flexston.com

Appendix: Approximate Back-up Time Table

Model

InvertFlex 1K

Model

InvertFlex 2K

Load (VA)

100

200

300

400

500

600

700

800

900

1000

Load (VA)

200

400

600

800

1000

1200

1400

1600

1800

2000

Backup Time @ 12Vdc 100Ah (min) Backup Time @ 12Vdc 200Ah (min)

766 1610

335

198

139

112

95

81

62

766

503

339

269

227

176

140

55

50

125

112

Backup Time @ 24Vdc 100Ah (min) Backup Time @ 24Vdc 200Ah (min)

766 1610

335

198

766

503

139

112

95

81

62

55

50

339

269

227

176

140

125

112

InvertFlex 3K

Model

2100

2400

2700

3000

Load (VA)

500

1000

300

600

900

1200

1500

1800

449

222

124

95

68

56

1100

525

303

227

164

126

48

35

31

28

108

94

74

67

Backup Time @ 48Vdc 100Ah (min) Backup Time @ 48Vdc 200Ah (min)

613 1288

268 613

InvertFlex 5K

1500

2000

2500

3000

3500

4000

4500

158

111

90

76

65

50

44

5000 40 90

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.

402

271

215

182

141

112

100

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