MPP Solar MS, LV MPPT Inverter / Charger

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

Introduction

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

Features

• Pure sine wave inverter
• Built-in MPPT solar charge controller
• Configurable input voltage range for home appliances and personal computers via LCD setting
• Configurable battery charging current based on applications via LCD setting
• Configurable AC/Solar Charger priority via LCD setting
• Compatible to mains voltage or generator power
• Auto restart while AC is recovering
• Overload/ Over temperature/ short circuit protection
• Smart battery charger design for optimized battery performance
• Cold start function

Basic System Architecture

The following illustration shows basic application for this inverter/charger. It also includes the 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 Diagram (Text Description: A diagram showing a solar panel array connected to the inverter/charger, which is also connected to a utility/generator input and a battery bank. The inverter/charger then powers home appliances.)

Product Overview

Diagram Description: The front panel of the inverter shows an LCD display, status indicators (AC/INV, CHG, FAULT), and function keys (ESC, UP, DOWN, ENTER). Rear panel views are shown for different models (1-3KVA, 4KVA/5KVA single, 4KVA/5KVA parallel, 1K-12V 230Vac). Key components are numbered and listed: 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 (for parallel models), 14. Current sharing cable (for parallel models), 15. Dry contact, 16. USB communication port.

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 the 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 the bottom cover by removing two screws as shown below.

Diagram Description: Shows the bottom cover of the inverter being removed by unscrewing two screws.

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.

Diagram Description: Shows recommended clearances around the inverter for mounting: 50cm top/bottom, 20cm sides. A warning symbol ⚠️ indicates: SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.

Install the unit by screwing three screws. It's recommended to use M4 or M5 screws.

Diagram Description: Shows screw locations for mounting the inverter on the wall for 1KVA/3KVA/4KVA/5KVA 48V models and 2-3KVA 24V/48V Plus models.

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:

Diagram Description: Shows a ring terminal with dimensions labeled L and D.

Please follow below steps to implement battery connection:

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

Diagram Description: Shows the DC input terminals on the inverter with labels PV+, PV-, POS+, NEG-. It also shows the battery connection terminals with POS+ and NEG- labels.

⚠️ WARNING: Shock Hazard

Installation must be performed with care due to high battery voltage in series.

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

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

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

AC Input/Output Connection

CAUTION!! Before connecting to AC input power source, please install a separate AC breaker between inverter and AC input power source. This will ensure the inverter can be securely disconnected during maintenance and fully protected from over current of AC input. The recommended spec of AC breaker is 10A for 1KVA, 20A for 2KVA, 32A for 3KVA, 40A for 4KVA and 50A for 5KVA.

CAUTION!! There are two terminal blocks with “IN” and “OUT” markings. Please do NOT mis-connect input and output connectors.

WARNING! All wiring must be performed by a qualified personnel.

WARNING! It's very important for system safety and efficient operation to use appropriate cable for AC input connection. To reduce risk of injury, please use the proper recommended cable size as below.

Suggested cable requirement for AC wires

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 [ground symbol] first.
4. Then, insert AC output wires according to polarities indicated on terminal block and tighten terminal screws. Be sure to connect PE protective conductor [ground symbol] first.

Diagram Description: Shows AC input and output terminal blocks with L, N, and PE (ground) connections. The PE connection is indicated by a ground symbol [ground symbol].

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

CAUTION: Important

Be sure to connect AC wires with correct polarity. If L and N wires are connected reversely, it may cause utility short-circuited when these inverters are worked in parallel operation.

CAUTION: Appliances such as air conditioner are required at least 2~3 minutes to restart because it's required to have enough time to balance refrigerant gas inside of circuits. If a power shortage occurs and recovers in a short time, it will cause damage to your connected appliances. To prevent this kind of damage, please check manufacturer of air conditioner if it's equipped with time-delay function before installation. Otherwise, this inverter/charger will trig overload fault and cut off output to protect your appliance but sometimes it still causes internal damage to the air conditioner.

PV Connection

CAUTION: Before connecting to PV modules, please install separately a DC circuit breaker between inverter and PV modules.

WARNING! All wiring must be performed by a qualified personnel.

WARNING! It'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.

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

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.

Diagram Description: Shows PV input terminals on the inverter with POS+ and NEG- labels, and connection cables with '+' and '-' polarity markings.

Final Assembly

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

Diagram Description: Shows the back view of the inverter models (1KVA/2KVA/3KVA/4KVA/5KVA and 2KVA Plus/3KVA Plus) with the bottom cover being reattached.

Communication Connection

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

Dry Contact Signal

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

When program 38 is set as "disable" (default setting):

When program 38 is set as “enable":

Operation

Power ON/OFF

Once the unit has been properly installed and the batteries are connected well, simply press the 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 the below chart, is on the front panel of the inverter. It includes three indicators, four function keys, and an LCD display, indicating the operating status and input/output power information.

Diagram Description: Shows the front panel of the inverter with the LCD display, LED indicators (AC/INV, CHG, FAULT), and function keys (ESC, UP, DOWN, ENTER).

Function Keys

LCD Display Icons

Diagram Description: Shows the LCD display with various icons and their meanings.

Battery Information

In battery mode, it will present battery capacity.

Load Information

OVER LOAD: Indicates overload.

Diagram Description: Shows load percentage icons for 0-24%, 25-49%, 50-74%, and 75-100%.

Mode Operation Information

• Diagram Description: Shows icons indicating unit connects to the mains. Indicates unit connects to the mains.
• Diagram Description: Shows icons indicating unit connects to the PV panel. Indicates unit connects to the PV panel.
• Diagram Description: Shows icons indicating load is supplied by utility power. Indicates load is supplied by utility power.
• Diagram Description: Shows icons indicating the utility charger circuit is working. Indicates the utility charger circuit is working.
• Diagram Description: Shows icons indicating the DC/AC inverter circuit is working. Indicates the DC/AC inverter circuit is working.

Mute Operation

Diagram Description: Shows an icon indicating unit alarm is disabled. Indicates unit alarm is disabled.

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:

Display Setting

The LCD display information will be switched in turns by pressing "UP" or "DOWN" key. The selectable information is switched as below order: input voltage, input frequency, PV voltage, MPPT charging current, MPPT charging power, battery voltage, output voltage, output frequency, load percentage, load in VA, load in Watt, DC discharging current, main CPU Version and second CPU Version.

Operating Mode Description

Fault Reference Code

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

Warning Indicator

Equalization (Only available for 4KVA/5KVA model)

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

How to Equalization

Users can equalize battery manually. Please follow below steps to set up battery equalization.

1. After pressing and holding ENTER button for 3 seconds, LCD will go to setting page.
2. Select program 01 and set it as "UTI". The output priority will be utility first.
3. Select program 02 and set the equalization charging current you need for battery. Below screen is to set up equalization current as 60A.
4. Select program 05 and set it as "USE". It's use-defined battery type.
5. Select program 16 and set it as "SNU". Charging priority will be solar and utility together.
6. Select program 26 and set the bulk charging current you need for battery. It will be max. charging voltage for equalization. Below screen is to set up max. charging voltage as 56.4V.
7. Select program 32 and set the charging time for C.V stage. It will be charging time for battery equalization. Below screen is to set up charging time as 900 min.

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

Specifications

Table 1 Line Mode Specifications

Table 2 Inverter Mode Specifications

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

Table 3 Charge Mode Specifications

Utility Charging Mode

Solar Charging Mode

Table 4 General Specifications

Trouble Shooting

Appendix: Approximate Back-up Time Table

1KVA

1KVA / 2KVA / 3KVA

1KVA / 2KVA / 3KVA / 4KVA

5KVA

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.