SolaX X3-MEGA G2 Series User Manual

1. Notes on this Manual

This manual is an integral part of the X3-Mega G2 Series and describes the assembly, installation, commissioning, maintenance, and troubleshooting of the product. Read it carefully before operating.

1.1 Scope of Validity

Models covered: X3-MGA-20K-G2-LV, X3-MGA-25K-G2-LV, X3-MGA-30K-G2-LV, X3-MGA-35K-G2-LV, X3-MGA-40K-G2, X3-MGA-50K-G2, X3-MGA-60K-G2.

Note on Model Naming: "X3" denotes three phases, "MGA" denotes Mega, "20K" denotes 20 kW. Each model is available with LED indicator lights and LCD.

Voltage Ranges: 20K/25K/30K/35K inverters operate in the 127 V / 220 V low voltage range. 40K/50K/60K inverters operate in the 230 V / 400 V voltage range.

Keep this manual in an accessible location at all times.

1.2 Target Group

This manual is intended for qualified electricians. All tasks described herein must only be performed by qualified electricians.

1.3 Symbols Used

The following symbols are used to indicate safety instructions and general information:

• DANGER! indicates a hazardous situation which, if not avoided, will result in death or serious injury.
• WARNING! indicates a hazardous situation which, if not avoided, could result in death or serious injury.
• CAUTION! indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTE! provides tips valuable for optimal product operation.

2. Safety

2.1 Appropriate Usage

The X3-Mega G2 Series are PV inverters that convert DC current from PV generators into AC current for feeding into the public grid.

Surge Protection Devices (SPDs) for PV Installation

WARNING! Over-voltage protection with surge arresters must be provided when the PV power system is installed. The grid-connected inverter is fitted with SPDs on the MAINS side.

Induced surges are a common cause of lightning damage, especially in areas with long overhead power lines. Surges can be induced on both PV array conductors and AC cables. Specialists in lightning protection should be consulted. Appropriate external lightning protection can mitigate direct lightning strike effects and discharge lightning current into the ground.

Installation of SPDs is crucial for protecting the inverter against mechanical damage and excessive stress. This includes surge arresters for buildings with external lightning protection systems (LPS), ensuring adequate separation distance.

For the DC system, surge suppression devices (SPD type 2) should be fitted at the inverter end of the DC cabling and at the array between the inverter and the PV generator. If the voltage protection level (VP) of surge arresters exceeds 1100 V, an additional SPD type 3 is required for electrical devices.

For the AC system, surge suppression devices (SPD type 2) should be fitted at the main incoming point of the AC supply (consumer's cutout), located between the inverter and the meter/distribution system. SPD (test impulse D1) is required for signal lines according to EN 61632-1.

All DC cables should be installed with the shortest possible runs. Positive and negative cables of the string or main DC supply should be bundled together. Avoid creating loops in the system. This includes any associated earth bundling conductors.

Spark gap devices are not suitable for DC circuits once conducting, as they will not stop conducting until the voltage passes through their terminals, typically less than 30 volts.

Anti-Islanding Effect

Islanding effect is a phenomenon where a grid-connected PV system continues to supply power to the local grid when the main electrical grid power is absent. This is dangerous for maintenance personnel and the public. The X3-Mega G2 series provides Active Frequency Drift (AFD) to prevent islanding.

2.2 Important Safety Instructions

DANGER! Danger to life due to high voltages in the inverter!

• All work must be performed by a qualified electrician.
• The appliance is not intended for use by children or persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction.
• Children should be supervised to ensure they do not play with the appliance.

CAUTION! Danger of burn injuries due to hot enclosure parts!

• During operation, the upper lid and the enclosure body may become hot.
• Only touch the lower enclosure lid during operation.

CAUTION! Possible damage to health from radiation effects!

• Do not stay closer than 20 cm to the inverter for any length of time.

NOTE! Grounding the PV generator.

• Comply with local requirements for grounding PV modules and the PV generator. SolaX recommends connecting the generator frame and other conductive surfaces to ensure continuous conduction and grounding for optimal system and personal protection.

WARNING! Ensure input DC voltage is less than the maximum DC voltage. Over-voltage may cause permanent damage to the inverter or other losses, which will not be covered by warranty!

WARNING! Authorized service personnel must disconnect both AC and DC power from the X3-Mega G2 series before attempting any maintenance, cleaning, or working on any circuits connected to the X3 series.

WARNING! Do not operate the inverter while the device is running.

WARNING! Risk of electric shock!

• Read this section carefully before application to ensure correct and safe application. Keep the user manual properly.
• Use only attachments recommended or sold by SolaX. Otherwise, there is a risk of fire, electric shock, or injury.
• Ensure existing wiring is in good condition and not undersized.
• Do not disassemble any parts of the inverter not mentioned in the installation guide. It contains no user-serviceable parts. Refer to the warranty for service instructions. Attempting to service the X3 Series inverter yourself may result in electric shock or fire and will void your warranty.
• Keep away from flammable or explosive materials to prevent fire hazards.
• The installation location should be away from humid or corrosive substances.
• Authorized service personnel must use insulated tools when installing or working with this equipment.
• PV modules must have an IEC 61730 Class A rating.
• Never touch either the positive or negative pole of the PV connecting device. Strictly prohibit touching both simultaneously.
• The unit contains capacitors that remain charged to a potentially lethal voltage even after the MAINS and PV supply have been disconnected.

WARNING! Hazardous voltage will be present for up to 5 minutes after disconnection from the power supply.

CAUTION - RISK of electric shock from stored energy in capacitors. Never operate on solar inverter couplers, MAINS cables, PV cables, or the PV generator when power is applied. After switching off PV and Mains, always wait 5 minutes for intermediate circuit capacitors to discharge before unplugging DC and MAINS couplers.

When accessing the internal circuit of the solar inverter, it is crucial to wait 5 minutes before operating the power circuit or removing electrolyte capacitors. Do not open the device prematurely, as capacitors require time to discharge sufficiently.

Measure the voltage between terminals UDC+ and UDC- with a multimeter (impedance at least 1Mohm) to ensure the device is discharged before beginning work (35 VDC) inside the device.

PE Connection and Leakage Current

The inverter incorporates a certified internal Residual Current Device (RCD) for protection against electrocution and fire hazards due to malfunctions in cables or the inverter. It has two trip thresholds as per IEC 62109-2:2011.

• Default electrocution protection: 30 mA.
• Slow rising current protection: 300 mA.

If an external RCD is required by local regulations, check the required RCD type. Type-A RCD is recommended. Recommended RCD values are 100 mA or 300 mA, unless lower values are specified by local electric codes. Type B RCD may be used if required by local regulations.

The device is intended for connection to a PV generator with a capacitance limit of approximately 700 nF.

WARNING! High leakage current! Earth connection is essential before connecting the supply.

• Incorrect grounding can cause physical injury, death, equipment malfunction, and increase electromagnetic interference.
• Ensure the grounding conductor is adequately sized as required by safety regulations.
• Do not connect ground terminals in series for multiple installations. This product can cause current with a DC component.
• If an RCD or RCM device is used for protection against direct or indirect contact, only one Type B RCD or RCM is allowed on the supply side of this product.

Regulations for United Kingdom

• Installation connecting equipment to supply terminals must comply with BS 7671.
• PV system electrical installation must comply with BS 7671 and IEC 60364-7-712.
• No protection settings can be altered.
• Installers must ensure equipment is installed and operated to maintain compliance with ESQCR22 (1)(a) at all times.

Regulations for Australia and New Zealand

• Electrical installation and maintenance must be conducted by a licensed electrician and comply with Australia National Wiring Rules.

2.3 Explanation of Symbols

This section explains the symbols shown on the inverter and its type label.

Symbols on the Inverter

Symbols on the Type Label

The inverter complies with the requirements of the applicable UKCA guidelines.

The inverter complies with the requirements of the applicable UKNI guidelines.

Beware of hot surface. The inverter can become hot during operation. Avoid contact during operation.

Danger of high voltages. Danger to life due to high voltages in the inverter!

Danger. Risk of electric shock!

Observe enclosed documentation.

The inverter cannot be disposed of with household waste. Disposal information can be found in the enclosed documentation.

Do not operate this inverter until it is isolated from mains and on-site PV generation suppliers.

Danger to life due to high voltage. There is residual voltage in the inverter which needs 5 minutes to discharge. Wait 5 minutes before opening the upper lid or the DC lid.

2.4 EC Directives

This chapter outlines the requirements of European low voltage directives, including safety instructions and conditions for the end-use system. Failure to comply may result in physical injury, death, or unit damage. Read these instructions before working on the unit. Contact an authorized service dealer if you do not understand any dangers, warnings, cautions, or instructions.

The Grid-connected inverter complies with the Low Voltage Directive (LVD) 2014/35/EU and Electromagnetic Compatibility (EMC) Directive 2014/30/EU. The unit is based on:

• EN 62109-1:2010
• EN 62109-2:2011
• IEC 62109-1 (ed.1)
• IEC 62109-2 (ed.1)
• EN 61000-6-3:2007+A:2011
• EN 61000-6-1:2007
• EN 61000-6-2:2005

For PV system installations, the unit's startup (start of designated operation) is prohibited until the full system is confirmed to meet the requirements of EC Directives (2014/35/EU, 2014/30/EU, etc.).

The grid-connected inverter leaves the factory fully connected and ready for mains and PV supply. Installation must comply with national wiring regulations. Correct system configuration and wiring are essential for safety compliance. The system must be installed only by professional assemblers familiar with safety and EMC requirements. The assembler is responsible for ensuring the end system complies with all relevant laws in the country of use.

Individual subassemblies must be interconnected using wiring methods outlined in national/international codes, such as the national electric code (NFPA) No.70 or VDE regulation 0107.

3. Introduction

3.1 Photovoltaic Grid Connected System

The X3-Mega G2 is a three-phase transformerless grid-connected inverter, a key component of photovoltaic power generation systems. It converts DC power from PV panels into AC power, optimizing self-consumption or feeding into the public grid.

Diagram: Photovoltaic Grid Connected System

Depicts a system with A: Photovoltaic string, B: X3-Mega G2 series inverter, and C: Public grid.

Warning! The inverter must not be connected to PV strings requiring positive or negative grounding. Do not connect local loads between the inverter and the AC side circuit breaker.

Supported Grid Types:

The X3-Mega G2 inverter supports TN-S, TN-C, TN-C-S, TT, and IT power grids.

• 20 kW-35 kW inverters connect to 220 V / 127 V three-phase four-wire power grids.
• 40 kW-60 kW inverters connect to 380 V / 400 V three-phase four-wire power grids, with or without an N line.

Illustrates TN-C, TN-C-S, TN-S, TT, and IT grid connection configurations showing L1, L2, L3, N, and PE connections to the inverter.

3.2 Basic Features

The SolaX X3-Mega G2 Series inverter offers state-of-the-art technology, high reliability, and convenient control features.

More energy harvest:

• Maximum efficiency: 98.4%
• MPPT voltage range: 180-1000 Vdc
• Maximum 6 MPPTs, with 2 strings per MPP tracker
• 150% PV oversizing input, 110% overloading output
• Maximum MPPT current: 32A
• Maximum string current: 16A

Safety & reliability:

• IP66 protection level
• AFCI protection (optional)
• Internal AC & DC SPDs (Type 2); Type 1 SPD is optional

Intelligence for easy maintenance and economy:

• SVG function supported
• Built-in export power control
• 24-hour operation monitoring
• Remote setting and upgrading
• Power Line Communication (PLC)
• Smart I-V Curve Diagnosis supported
• Aluminum AC cable connection available
• Current measurement for each of 24 input strings
• Smart air cooling for longer fan lifespan
• Advanced heat dissipation reduces size and weight by over 10%

3.3 Overview of the Inverter

Diagram shows the front panel of the inverter with labeled ports:

• A: DC Switch
• B: Pocket WiFi / LAN / 4G (optional)
• C: DC Connector
• D: RS 485 / Meter / DRM (optional)
• E: AC Connector
• F: Grounding Connector
• G: Cooling fan inside

WARNING! Only authorized personnel are allowed to set the connection.

3.4 Dimension of the Inverter

Inverter dimensions: 630 mm (width) x 521 mm (height) x 286 mm (depth).

3.5 Principle Description

The inverter uses multi-channel MPPT for DC input to maximize power under varying photovoltaic conditions. It converts DC to AC that meets grid requirements and feeds it into the power grid. Lightning arresters on the AC/DC sides provide surge protection.

Block diagram illustrating the internal components and signal flow, including DC switches, DC surge protectors, input EMI filters, DC/DC boost circuits, DC/AC inverter circuits, output filters, AC surge protectors, and output relays.

4. Technical Data

4.1 DC Input

4.2 AC Output

4.3 Efficiency, Safety and Protection

4.4 General Data

5. Mechanical Installation

5.1 Installation Precaution

DANGER! Before installation, ensure there is no electrical connection. Before drilling holes on the wall, verify the layout of water pipes and cables inside the wall to avoid any danger.

CAUTION! Personal injury and machine damage may occur due to improper movement of the inverter. Strictly comply with the instructions in this manual when moving and installing the inverter.

5.2 Selection for the Installation Position

The chosen installation location is critical for the inverter's safety, service life, and performance.

• The X3-Mega G2 series has IP66 ingress protection, allowing installation outdoors.
• The installation position should be convenient for wiring connection, operation, and maintenance.

5.2.1 Installation Environment Required

The installation position must be well-ventilated. Ensure the site meets the following conditions:

• Not exposed to glare.
• Not in areas where highly flammable materials are stored.
• Not in potential explosive areas.
• Not in direct cool air flow.
• Not near television antennas or antenna cables.
• Not higher than approximately 4000m above sea level.
• Not in environments with precipitation or humidity (0-100%).
• Ensure good ventilation.
• Ambient temperature range: -25°C to +60°C.
• Avoid direct sunlight, rain exposure, and snow accumulation during installation and operation.

Visuals showing: No direct sunlight (✓), No rain exposure (✓), No snow lay up (✓). And Direct sunlight (X), Rain exposure (X), Snow lay up (X).

5.2.2 Installation Carrier Required

The wall or stand used for hanging the inverter must meet the following conditions:

1. Solid brick/concrete or a mounting surface of equivalent strength.
2. The inverter must be supported or strengthened if the wall/stand strength is insufficient (e.g., wooden walls, walls covered with thick decorative layers).

5.2.3 Installation Angle Required

• The inclination angle for flat installation must be greater than 10° and should not be tilted forward, inverted, excessively tilted backward, or sideways.
• The inverter must be installed more than 500 mm above the ground.

Diagrams showing correct and incorrect installation angles and clearance from the ground.

5.2.4 Installation Space Required

To ensure good heat dissipation and convenient disassembly, maintain minimum clearances around the inverter as shown:

Diagram showing minimum clearances: ≥500 mm above, ≥600 mm below, ≥600 mm on sides.

For multi-inverter installations, maintain at least 1200 mm space between adjacent inverters (left/right) and at least 500 mm between upper and lower inverters.

Diagram showing multi-inverter spacing: ≥1200 mm between units horizontally, ≥500 mm vertically.

5.3 Tools Preparation

Required tools for installation:

5.4 Check for Transport Damages

Ensure the inverter is intact during transportation. If visible damages (e.g., cracks) are present, contact your dealer immediately.

5.5 Packing Lists

Upon opening the package, check the product and accessories against the packing list:

• X3-Mega G2 Inverter x1
• Bracket x1
• Communication terminal x1
• M8 Bolt x2
• Female DC connector x12
• Male DC connector x12
• M8x80 Expansion screw x4
• DC protective shield x1
• Double offset ring wrench x1
• Quick Installation Guide
• User Manual x1
• Installation guide x1
• Wi-Fi (Optional)

5.6 Installation Steps

5.6.1 Installation Steps of Mounting the Inverter on the Wall

Step 1: Fix the bracket on the wall

1. Locate expansion screws, bracket, and M8 bolts from the accessory box.
2. Use the bracket as a template to mark drilling hole positions on the wall using a digital level and marker.
3. Drill holes using a 12mm drill bit according to the marks. The depth of the holes should be at least 65 mm.
4. Insert expansion screws into the holes and tap them into the wall with a hammer. Hang the bracket on the screws and secure it with nuts.

Step 2: Hang the inverter on the bracket

• Lift the inverter. Two methods are available:
• Method 1: Two installers directly hold the inverter on the sides and lift it up.
• Method 2: Install two lifting rings on the inverter's sides and lift it up using the rings.
• Hang the inverter on the bracket and secure it with M8 bolts.

5.6.2 Installation Steps of Mounting Inverter on the Stand

Step 1: Fix the bracket on the stand

1. Locate the bracket and M8 bolts from the accessory box. Prepare four M8x40 screws (not included in the accessory box).
2. Select an appropriate stand for the inverter. The bracket size is provided for reference.
3. Use the bracket as a template to mark drilling hole positions on the stand with a digital level and marker.
4. Drill holes using a 10mm drill bit according to the marks.
5. Pre-install the bracket onto the stand and secure it with M8x40 screws.

Step 2: Hang the inverter on the bracket

• Lift the inverter using Method 1 (two installers) or Method 2 (lifting rings).
• Hang the inverter on the bracket and secure it with M8 bolts.

6. Electrical Connection

6.1 Grounding Connection

All uncharged metal parts of the photovoltaic system, including the substrate bracket and inverter shell, must be reliably grounded. Grounding points of multiple inverters and PV arrays should connect to the same grounding bus for equipotential connection.

Step 1: Make the grounding cable

1. Select a 16-25 mm² yellow and green conductor of appropriate length. Use a wire cutter and OT copper terminal. Strip the insulation layer of the conductor end as shown.
2. Tighten the stripped end and slide heat-shrink tubing over the grounding cable. The tubing should cover the cable section as indicated.
3. Insert the stripped section into the OT copper terminal and crimp using a crimping tool.
4. Pull heat-shrink tubing over the crimped OT terminal section and shrink it with a hot-air blower for a firm connection.

Step 2: Connect the grounding cable to the inverter

Connect the grounding cable to the inverter and tighten with a torque of 12 N·m.

WARNING! Ensure the ground wire is connected!

6.2 PV String Connection

WARNING! Before connecting the inverter, ensure the open circuit voltage of the photovoltaic string does not exceed 1100 V under any conditions, otherwise, the inverter will be damaged.

WARNING! Do not ground the positive or negative pole of the PV string, as this will cause serious damage to the inverter.

WARNING! Ensure the positive and negative poles of the PV string are correctly connected to the corresponding inverter terminals.

Step 1: Make the PV cable

1. Locate the 12 positive and 12 negative DC connectors from the accessory box.
2. Disassemble the connector into PV pin, terminal, and fastening head.
3. Turn off the DC switch. Prepare a 4-6 mm² PV cable. Use a wire stripper to strip 6 mm of insulation from the PV cable end.
4. Tighten the stripped section and insert it into the PV pins. Use a terminals press clamp to ensure firm contact between the PV cable and the pins.
5. Insert the PV cable through the fastening head and the plug (male and female). Force the plug onto the cable until it clicks, indicating a complete connection. Tighten the fastening head. (Torque: 1.2 ± 0.1 N·m)

Step 2: Measure the voltage of DC input

Use a multimeter to measure the DC input PV voltage. Verify the polarity of the DC input cable and ensure the voltage for each string is within the inverter's range.

Step 3: Connect the PV cable to the inverter

Connect the PV cables to the corresponding PV ports on the inverter.

WARNING! If the DC cable is connected in reverse or the inverter malfunctions, do not turn off the DC switch directly, as this may damage the inverter or cause a fire!

Correct operation:

• Use a clamp current meter to measure the DC string current.
• If the current is greater than 0.5A, wait until it drops below 0.5A.
• Only when the current is less than 0.5A, can the DC power be cut off and the DC string disconnected.

Inverter damage caused by illegal operation is not covered by warranty.

Requirements for photovoltaic modules connected to the same circuit:

• All PV modules must be of the same specification.
• All PV modules must have the same tilt angle and orientation.
• The open circuit voltage of the PV string must not exceed 1100 V at the coldest expected temperature.

WARNING! Electric shock! Do not touch live DC wires. When PV modules are exposed to light, high voltage occurs, posing a risk of electric shock, potentially leading to death from contact with DC conductors.

6.3 Grid Connection

WARNING! Ensure the electrical connection design meets local national and local standards.

WARNING! The PE wire (ground wire) of the inverter must be reliably grounded.

WARNING! Disconnect the circuit breaker or fuse of the inverter and the grid connection access point.

Notes:

• It is recommended to add a circuit breaker or fuse at the AC side with a specification more than 1.25 times the rated AC output current.
• 70-240 mm² copper wire is recommended. For aluminum wire, consult the inverter manufacturer.
• Use copper terminals for copper wire and copper-aluminum terminals for aluminum wire. Do not use aluminum terminals directly.

Step 1: Make the AC cable

1. Locate the AC protective shield from the accessory box.
2. Disassemble the shield into its parts: fastening head, blue rubber seal ring, orange rubber seal ring, red rubber seal ring, black part, and protective shield body. (Note: Colored seal rings are for smaller cable sizes; the black part is not used.)
3. Select an appropriate OT terminal and a black, red, yellow, and green cable of proper length. Use a wire cutter and stripper to strip 15mm insulation from the AC cable end.
4. Insert the AC cable through the fastening head and AC protective shield, and pre-tighten the fastening head.
5. Pull heat-shrink tubing over the AC cable.
6. Insert the stripped section into the OT terminal and crimp. Pull heat-shrink tubing over the crimped section and shrink with a hot-air blower for a firm connection.

Step 2: Connect the AC cable to the inverter

1. Disassemble the five screws using a socket wrench. Connect the AC cable to the corresponding AC terminals using a cross screwdriver. Tighten the screws to 6 N·m.
2. Loosen the fastening head. Clockwise screw in the screws (torque 1 N·m) to fix the AC protective shield with a cross screwdriver. Then tighten the fastening head.

6.4 Communication Connection

6.4.1 Communication Signal Definition

Diagram showing the pinout of the communication port (21 pins).

6.4.2 Connection Steps of Communication Cable

1. Locate the communication terminal from the accessory box and disassemble it into its parts: COM terminal, Housing, Body, Seal ring, Seal body, Claw nut.
2. Select a 0.5-0.75 mm² conductor. Use a wire stripper to strip 12-14 mm of insulation from the cable end and insert the insulated cord end terminal to the cable end (ENY0512 for 0.5 mm²/22 AWG; ENY7512 for 0.75 mm²/20 AWG).
3. Use a terminals press clamp to ensure firm contact between the terminal and the cable end.
4. Assemble the nut, claw, seal body, seal ring, and body onto the communication cable in sequence.
5. Insert the tube-type terminal into the housing according to the label. Push the terminal-inserted housing into the body until it clicks, indicating a complete connection.
6. Push the seal body into the seal ring, then push the claw.
7. Clockwise tighten the nut with a torque of 8 ± 2 N·m.
8. With buttons on both sides pressed, connect it to the COM port of the inverter. A click sound indicates a correct connection.

6.4.3 Release Steps of Communication Cable

To release the communication cable, press the buttons on both sides and pull out the cable.

6.5 Monitoring Connection

SolaX Cloud is a mobile application for communicating with the inverter via Wi-Fi/LAN/4G, enabling alarm query, parameter configuration, and daily maintenance.

Plug the Dongle into the "USB" port at the bottom of the inverter. After powering on the DC or AC side, the APP and inverter can connect. Refer to the corresponding manual for details.

Wi-Fi connection

The SolaX Pocket WiFi Dongle connects to a local network within 50 meters, enabling access to the SolaX Cloud monitoring platform.

Diagram showing Wi-Fi connection: Inverter -> Pocket WiFi Dongle -> Router -> SolaX Cloud.

LAN connection

If Wi-Fi is not suitable, the Pocket LAN allows connection to the network via an Ethernet cable, providing a more stable connection with less interference.

Diagram showing LAN connection: Inverter -> Pocket LAN Dongle -> Router -> SolaX Cloud.

4G connection

The SolaX Pocket 4G dongle enables 4G monitoring without a local network connection. (This product is not available in the UK).

Basic setting and advanced setting

Basic settings include time, date, and language.

Advanced settings include Safety, System Switch, PV Connection, Active Power Control, Export Control, Reactive Power Control, Grid Voltage Parameters, Grid Frequency Parameters, Grid Through Parameters, Check Parameters, Reset, Communication Parameters, and New Password.

7. Start up the Inverter

Start inverter after checking all below steps:

• Ensure the device is securely fixed on the wall or stand.
• Ensure all DC and AC breakers are disconnected.
• Verify the AC cable is correctly connected to the grid.
• Confirm all PV panels are correctly connected to the inverter. Seal unused DC connectors with covers.
• Turn the DC switch to the "ON" position.

Start the inverter

The inverter will start automatically when PV panels generate sufficient energy. Check the status of the LED indicators.

If LED indicators are not lit, check the following:

• All connections are correct.
• All external circuit breakers are closed.
• The inverter's DC switch is in the "ON" position.

LED Indicator Status Definitions:

Note: During firmware upgrades, three LEDs may flash except the communication signal light. Do not operate the inverter until the upgrade is finished.

8. Troubleshooting

8.1 Troubleshooting

This section provides procedures for solving common problems with X3 series inverters. Follow these steps to identify and resolve issues.

Check warning or fault messages on the System Control Panel or inverter information panel. Record any displayed messages before proceeding.

If no fault light is displayed, check the installation state:

• Is the inverter in a clean, dry, well-ventilated place?
• Are the DC input breakers open?
• Are cables adequately sized and short?
• Are input/output connections and wiring in good condition?
• Are configuration settings correct for the installation?
• Are the display panel and communication cable properly connected and undamaged?

For further assistance, contact SolaX Customer Service. Be prepared to provide system details, model, and serial number.

Global Service Center: +86 (571) 56260033 ext 749

General Enquiry: +86 (571) 56260011

Sales Enquiry: +86 (571) 56260008

E-Mail: info@solaxpower.com

Fax: +86 (571) 56075753

Troubleshooting Table:

8.2 Routine Maintenance

Inverters generally require minimal maintenance. For long-term optimal operation of the X3-Mega G2, perform routine maintenance. Power off the system before cleaning, connecting cables, or performing grounding maintenance.

Fan Maintenance

The external fans operate continuously and require cleaning approximately once a year to maintain normal working state. If a fan fails, it may need repair or replacement by a professional.

1. Before fan maintenance, disconnect AC power, then the DC switch, and wait 5 minutes.
2. Unscrew the fan cover fixing screws to remove the cover.
3. Remove the fan support fixing screws.
4. Pull out the fan bracket to about 150 mm, disconnect the fan waterproof connector, then pull the fan bracket further to remove the entire bracket.
5. Clean, repair, or replace the fan as needed.

Diagrams showing fan cover fixing screws and fan support fixing screws.

Safety Checks

Safety checks should be performed at least every 12 months by a qualified person with adequate training and experience. Record data in an equipment log. If the device malfunctions or fails a test, it must be repaired. Refer to Section 2 (Safety Instructions and EC Directives) for detailed safety check information.

Periodic Maintenance:

Only qualified personnel should perform these tasks:

1. Check cooling fins for dirt; clean and absorb dust as necessary. This check should be done periodically.
2. Check inverter indicators, keys, and display for normal state at least every 6 months.
3. Check input and output wires for damage or aging at least every 6 months.
4. Verify ground terminal and cable connections are secure, and all terminals and ports are properly sealed every 12 months.
5. Clean inverter panels and check their security at least every 6 months.

9. Decommissioning

9.1 Dismantling the Inverter

• Disconnect the inverter from DC Input and AC output.
• Wait 5 minutes for de-energizing.
• Disconnect communication and optional connection wirings.
• Remove the inverter from the bracket.
• Remove the bracket if necessary.

WARNING! Before dismantling, disconnect the DC switch, then unplug PV and AC cables to avoid electric shock hazard.

9.2 Packaging

If possible, pack the inverter using its original packaging. If unavailable, use an equivalent carton meeting these requirements:

• Suitable for loads over 80 kg.
• With handles.
• Can be fully closed.

9.3 Storage and Transportation

Store the inverter in a dry place with ambient temperatures between -25°C and +60°C. Handle with care during storage and transportation. Stack no more than 4 cartons high.

9.4 Disposing of the X3-Mega G2

When the X3-Mega G2 reaches the end of its service life, dispose of it according to local regulations for electrical equipment waste.

10. Disclaimer

SolaX is not liable for service, technical support, or compensation under the following conditions, including but not limited to:

• Inverter damage due to force majeure (earthquake, flood, lightning, fire, volcanic eruption, etc.).
• Expired warranty without extended warranty purchase.
• Inability to provide inverter SN, warranty card, or invoice.
• Inverter damage due to man-made causes, or operation against local policy.
• Installation, configuration, or commissioning not following manual requirements.
• Inverter installation, refitting, or operation in improper ways without SolaX authority.
• Inverter installation or operation under improper environmental or electrical conditions without SolaX authority.
• Inverter hardware or software changes, updates, or disassembly without SolaX authority.
• Obtaining communication protocols through illegal channels.
• Building monitoring or control systems without SolaX authority.
• Connecting to other brands' batteries without SolaX authority.

SolaX reserves the right to interpret all contents of this user manual.

Warranty Registration Form

For Customer (Compulsory)

Name:

Phone Number:

Address:

State:

Product Serial Number:

Date of Commissioning:

Installation Company Name:

Installer Name:

Country:

Email:

Zip Code:

Electrician License No.:

For Installer

Module (If Any):

• Module Brand:
• Module Size(W):
• Number of String:
• Number of Panel Per String:

Battery (If Any):

• Battery Type:
• Brand:
• Number of Battery Attached:

Date of Delivery:

Signature:

Please visit our warranty website: https://www.solaxcloud.com/#/warranty to complete the online warranty registration or scan the QR code with your mobile phone.

For more detailed warranty terms, please visit SolaX official website: www.solaxpower.com to check it.

Document Code: 614.00002.07

Warranty Registration Instructions:

PLEASE REGISTER THE WARRANTY IMMEDIATELY AFTER INSTALLATION!

GET YOUR WARRANTY CERTIFICATE FROM SOLAX!

KEEP YOUR INVERTER ONLINE & WIN SOLAX POINTS!

1. Open your camera app and point your device at the QR code.

2. Wait for the camera to recognize the QR code.

3. Click the banner or notification when it appears on the screen.

4. The warranty registration page will be loaded automatically.