1. General Information
The EPEVER XTRA-N G3 and XTRA-N G3 BLE series controllers are advanced Maximum Power Point Tracking (MPPT) solar charge controllers designed for various solar power systems. These controllers feature a new design concept, with the G3 BLE series incorporating a built-in Bluetooth module for convenient parameter reading and modification via a mobile application.
Utilizing an advanced MPPT control algorithm, these controllers achieve high tracking efficiency (up to 99.5%) and minimize power loss, ensuring maximum energy harvest under diverse conditions. They support independent voltage regulation, allowing direct connection of loads to the battery terminal even without a battery, and are compatible with various lithium battery types.
Key features include low self-consumption, automatic charging power reduction under high temperatures, IP33 ingress protection, and an isolated RS485 communication port for enhanced reliability and versatility. The three-stage charging mode prolongs battery lifespan, and comprehensive electronic protections ensure system durability and safety. These controllers are ideal for RVs, household systems, and monitoring applications.
Figure 1: EPEVER 40A MPPT Solar Charge Controller
1.1 Features
- High quality and low failure rate components (ST or IR) for extended service life.
- Advanced MPPT technology with ultra-fast tracking speed (up to 99.5% tracking efficiency).
- Maximum DC/DC transfer efficiency up to 98.5%; full load efficiency up to 97.2%.
- Accurate recognition and tracking of multi-peak maximum power points.
- Wider MPP (Maximum Power Point) running voltage to optimize PV utilization.
- Support for multiple battery types, including lithium batteries.
- Equipped with a stable self-activation function for lithium batteries.
- Battery temperature compensation.
- Charging power and current limited to rated values.
- Real-time energy statistics function.
- Automatic charging power reduction for over-temperature conditions.
- Built-in Bluetooth for settings adjustment via EPEVER APP (XTRA-N G3 BLE series only).
- RS485 communication interface with optional 4G or Wi-Fi modules for remote monitoring.
- Parameters configurable via PC software, APP, or remote meter.
- Constant voltage output function (ensure input power is higher than output power).
- Comprehensive electronic protections.
- Multiple load work modes.
- Dustproof and waterproof design with IP33 enclosure.
- Low self-consumption, lower than 10mA (after disabling COM port).
- Operation at full load without charging power reduction in the working temperature range.
2. Important Safety Instructions
Please keep this manual for future review. This manual contains all safety, installation, and operation instructions for the XTRA-N G3 or XTRA-N G3 BLE series MPPT controller.
2.1 Safety Instructions for Installation
- Read all instructions and warnings carefully before installation.
- No user-serviceable components exist inside. DO NOT disassemble or attempt to repair the controller.
- Mount the controller indoors. Avoid exposure to components and water.
- Install in a well-ventilated place. The heat sink may become very hot during operation.
- Install appropriate external fast-acting fuses/breakers.
- Disconnect all PV array connections and fuses/breakers before installation and adjustment.
- Power connections must remain tight to avoid excessive heating from loose connections.
WARNING:
Do not install the controller in humid, high salt spray, corrosion, greasy, flammable, explosive, dust accumulative, or other severe environments.
2.2 Other Safety Instructions (FCC Compliance)
- This device complies with Part 15 of the FCC Rules. Operation is subject to two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.
- Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
- This equipment has been tested and found to comply with the limits for a Class B digital device. It generates, uses, and can radiate radio frequency energy.
- If interference occurs, try to correct it by reorienting/relocating the receiving antenna, increasing separation, connecting to a different circuit, or consulting a technician.
- This equipment complies with FCC radiation exposure limits for an uncontrolled environment. It should be installed and operated with a minimum distance of 20cm between the radiator and your body.
2.3 Disclaimers
The warranty does not apply to the following conditions:
- Damage caused by improper use or inappropriate environment (e.g., humid, high salt spray, corrosion, greasy, flammable, explosive, dust accumulative).
- Actual current/voltage/power exceeding the controller's limit value.
- Damage caused by working temperature exceeding the rated range.
- Accidents (arc, fire, explosion) caused by failure to follow controller stickers or manual instructions.
- Unauthorized dismantling or attempted repair.
- Damage caused by force majeure.
- Damage occurred during transportation or handling.
3. Installation
3.1 Attentions
- Familiarize yourself with installation steps before proceeding.
- Wear eye protection when installing batteries, especially flooded lead-acid batteries. Have fresh water available for contact with battery acid.
- Keep batteries away from metal objects to prevent short circuits.
- Ensure good ventilation, as explosive battery gases may be released during charging.
- Avoid installing the controller in a sealed enclosure with vented batteries, as fumes can corrode circuits.
- Ensure tight power connections and use cable clamps to prevent high heat from loose connections or swaying in mobile applications.
- The controller supports lead-acid and lithium batteries.
- System cables should be selected according to 5A/mm² or less current density (NFPA 70, Article 690).
- Grounding wire size should not be less than 4mm².
- Tightening torque for wiring screws should not be less than 1.2N.m.
3.2 PV Array Requirements
The controller is suitable for various PV modules. The series number of PV modules depends on the open-circuit voltage (Voc) and maximum power point voltage (VMpp) of the MPPT controller. Refer to the full user manual PDF for detailed tables on PV array configurations for different system voltages and module types.
3.3 Wire Size
The wiring and installation methods must conform to national and local electrical code requirements. The PV wire size is determined by the PV array's short circuit current (ISC). The battery and load wire sizes must conform to the rated current. Refer to the full user manual PDF for detailed tables on recommended wire sizes and circuit breakers for different models and currents.
CAUTION:
When PV modules are connected in series, the open-circuit voltage of the PV array must not exceed 46V (XTRA**06N G3/BLE), 92V (XTRA**10N G3/BLE), 138V (XTRA**15N G3/BLE) at 25°C.
3.4 Mounting
The controller should be installed in a location with sufficient airflow. Maintain a minimum clearance of 150 mm from the upper and lower edges for natural thermal convection.
Figure 2: Built-in Bluetooth for APP control
3.4.1 Connection Diagram (Battery Mode)
Figure 3: Connection Diagram (Battery Mode)
3.4.2 Connection Diagram (No-Battery Mode)
When operating without a battery, the XTRA-N G3/XTRA-N G3 BLE series can be directly connected to an inverter. The inverter must be connected to the battery terminals of the controller. Ensure PV input power is sufficient for the load and inverter efficiency.
Figure 4: System Diagram (No-Battery Mode)
3.4.3 Grounding
XTRA-N G3/XTRA-N G3 BLE series are common-negative controllers. All negative terminals can be grounded simultaneously. The grounding terminal on the shell must be grounded to shield electromagnetic interference and prevent electric shock.
3.4.4 Connect Accessories
Connect the remote temperature sensor cable to the controller's RTS port and place the other end near the battery. If the temperature sensor is not connected, the default battery charging/discharging temperature setting is 25°C without compensation.
3.4.5 Powering On
Connect the battery's fast-acting fuse to power the controller. Check the battery indicator (should be green). Then, connect the fast-acting fuse and circuit breaker of the load and PV array. The system will operate in preprogrammed mode.
4. Display Units
The controller features an LCD display and buttons for monitoring and setting parameters.
Figure 5: Controller Display and Buttons
4.1 Indicator
| Indicator | Color | Status | Instruction |
|---|---|---|---|
| PV | Green | On Solid | PV charges battery with low current |
| Green | OFF | 1. No sunlight 2. Connection error 3. Low PV voltage | |
| Green | Slowly Flashing (1Hz) | Normal charging | |
| Battery | Green | Fast Flashing (4Hz) | PV Over voltage |
| Green | On Solid | Normal | |
| Load | Green | Slowly Flashing (1Hz) | Full |
| Green | Fast Flashing (4Hz) | Overvoltage | |
| Orange | On Solid | Under voltage | |
| PV&BATT | Red | On Solid | Over discharged |
| PV&BATT | Red | Slowly Flashing (1Hz) | Battery Overheating Lithium battery Low temperature |
| Load | Yellow | On Solid | Load ON |
| Load | Yellow | OFF | Load OFF |
| PV&BATT | Fast flashing | Controller Overheating System voltage error |
4.2 Button Functions
| Button | Action | Function |
|---|---|---|
| PV/+ | Press | PV browsing interface |
| Press & Hold 5s | Setting data + Setting LCD cycle time, enabling/disabling COM port | |
| BATT/- | Press | BATT browsing interface |
| Press & Hold 5s | Cursor displacement during setting Setting battery type, capacity, temperature unit | |
| LOAD/- | Press | Controller load browsing interface |
| Press & Hold 5s | Setting data Setting load working mode | |
| SET | Press | Enter into setting interface Switch setting interface to browsing interface Confirm setting parameter |
| Press & Hold 5s | Exit setting interface |
4.3 Display Icons
| Icon | Information | Icon | Information | Icon | Information |
|---|---|---|---|---|---|
| ☀️ | Day | 🚫⚡ | Not charging | 🚫💡 | Not discharging |
| 🌙 | Night | ⚡ | Charging | 💡 | Discharging |
5. Parameters Setting
5.1 Battery Parameters
5.1.1 Supported Battery Types
| Type | Battery | Details |
|---|---|---|
| Lead-Acid | Sealed | Default |
| Gel | ||
| Flooded | ||
| Lithium | LiFePO4 | (4S/8S/15S/16S) |
| Li(NiCoMn)O2 | (3S/6S/7S/13S/14S) | |
| User | User-defined | Customizable parameters |
Note: If the controller supports 48V system voltage, LiFePO4 F15/F16 and Li(NiCoMn)O2 N13/N14 will be displayed.
5.1.2 Local Setting
When the default battery type is selected, battery voltage parameters cannot be modified. To change these, select the "USE" type. Detailed operations for entering "USE" battery type and setting parameters like System Voltage Level (SYS), Boost Charging Voltage (BCV), Float Charging Voltage (FCV), Low Voltage Reconnect Voltage (LVR), Low Voltage Disconnect Voltage (LVD), and Lithium Battery Protection Enable (LEN) are available in the full user manual PDF.
5.1.3 Remote Setting
Battery parameters can be set remotely via:
- PC Software: Connect the controller's RJ45 interface to a PC via a USB to RS485 cable.
- External WiFi Module: Connect an external WiFi module to the RS485 communication port.
- External Bluetooth Module: Connect an external Bluetooth module to the RS485 communication port.
- Built-in Bluetooth Module: (XTRA-N G3 BLE series only) Connect mobile phone via Bluetooth.
- MT52 Remote Meter: Connect the controller to an MT52 remote meter via a standard network cable.
Refer to the respective APP/software manuals or the full user manual PDF for detailed instructions on remote parameter setting.
5.2 Load Modes
5.2.1 LCD Setting
The controller supports multiple load working modes, configurable via the LCD display. These include:
- Manual Mode (Default): Control load ON/OFF via buttons or remote commands.
- Light ON/OFF Mode: Load turns ON at dusk and OFF at dawn.
- Light ON/OFF + Timer Mode: Load turns ON at dusk and stays ON for a set duration, then turns OFF.
- Time Control Mode: Control load ON/OFF based on real-time clock settings.
- Always ON Mode: Load maintains output state continuously (suitable for 24-hour power supply).
- Test Mode: For testing purposes.
Refer to the full user manual PDF for detailed tables of load modes and their settings.
5.2.2 RS485 Communication Setting
Load modes can also be set via PC software, APP, or MT52 remote meter. Refer to chapter 4.1.3 Remote Setting for connection diagrams and settings.
6. Protection Features
The EPEVER MPPT Solar Charge Controller includes comprehensive electronic protections to ensure system reliability and durability:
| Protection | Instructions |
|---|---|
| PV Over Current/Over Power | When PV array current or power exceeds rated, controller charges at rated value. WARNING: If PV charging current is higher than rated, PV open-circuit voltage cannot exceed maximum PV open-circuit voltage, or controller may be damaged. |
| PV Short Circuit | Controller not damaged if short-circuit occurs when not in PV charging state. WARNING: Forbidden to short-circuit PV array during charging, or controller may be damaged. |
| PV Reverse Polarity | Controller not damaged if PV array polarity is reversed; operates normally after correction. CAUTION: Controller is damaged if PV array is connected reversely and actual operating power exceeds 1.5 times rated charging power. |
| Night Reverse Charging | Prevents battery discharge to PV module at night. |
| Battery Reverse Polarity | Battery can be reversely connected when PV is disconnected or reversely connected. Correct wiring to resume work. WARNING: Controller will be damaged if PV connection is correct and battery connection is reversed! |
| Battery Over Voltage | Controller stops charging when battery voltage exceeds Over Voltage Disconnect Voltage to prevent overcharge. |
| Battery Over Discharge | Controller stops battery discharging when voltage is lower than Low Voltage Disconnect Voltage. |
| Battery Over-heating | Controller stops working if battery temperature exceeds 65°C and resumes below 55°C. |
| Lithium Battery Low Temperature | Controller stops charging/discharging if temperature is below Low Temperature Protection Threshold (LTPT). Resumes automatically when above LTPT. (LTPT is 0°C by default, settable within 10 ~ -40°C). |
| Load Short Circuit | Controller automatically cuts off output if load is short-circuited (≥ 4 times rated load current). Resumes after 5 delays (5s, 10s, 15s, 20s, 25s), or by pressing Load button, restarting, or waiting one night-day cycle. |
| Overload | Controller automatically cuts off output if load is overloading (≥ 1.02 times rated load current). Resumes after 5 delays (5s, 10s, 15s, 20s, 25s), or by pressing Load button, restarting, or waiting one night-day cycle. |
| Controller Over-heating | Controller stops working if internal temperature exceeds 85°C and resumes below 75°C. Reduced charging power mode activates at 81°C. |
| TVS High Voltage Transients | Internal circuitry includes Transient Voltage Suppressors (TVS). For areas with frequent lightning strikes, an external surge arrester is recommended. |
7. Troubleshooting
This section provides common issues, their possible causes, and troubleshooting steps.
| Possible Reason | Faults | Troubleshooting |
|---|---|---|
| PV array disconnection | Charging LED indicator off during daytime when sunshine falls on PV modules properly. | Confirm PV wire connections are correct and tight. |
| Battery voltage is lower than 8V | Wire connection is correct, controller not working. | Check battery voltage. At least 8V to activate controller. |
| Battery over voltage | Green charging indicator fast flashes. Battery level shows full, battery frame and fault icon blink. | Check if battery voltage is higher than OVD (over voltage disconnect voltage), and disconnect PV. |
| Battery over-discharged | Red charging indicator ON solid. Battery level shows empty, battery frame and fault icon blink. | When battery voltage is restored to or above LVR (low voltage reconnect voltage), load will recover. |
| Battery Overheating | Red battery indicator slow flashes. Battery frame and fault icon blink. | Controller automatically turns system off. When temperature declines below 55°C, controller resumes. |
| Controller Overheating | PV and BATT indicators fast flash. | Controller cuts off input/output if heat sink exceeds 85°C. Resumes below 75°C. |
| System voltage error | PV and BATT indicators fast flash. | 1. Check if battery voltage matches system voltage level set on controller. 2. Change matched battery or modify system voltage level. (Note: For no-battery application, ignore if system voltage level matches actual voltage. Alarm disappears after 3 mins or pressing Load button). |
| Load Short Circuit | 1. No load output. 2. LCD blinks "E001." 3. Load and fault icons blink. | 1. Check load connection, cancel fault. 2. Restart controller. 3. Wait for one night-day cycle (night time > 3 hours). |
| Load Overload | 1. No load output. 2. LCD blinks "E002." 3. Load and fault icons blink. | 1. Reduce electric equipment. 2. Restart controller. 3. Wait for one night-day cycle (night time > 3 hours). |
8. Maintenance
The following inspections and maintenance tasks are recommended at least twice yearly for best performance:
- Ensure the controller is firmly installed in a clean and dry ambient.
- Ensure no block on airflow around the controller. Clear any dirt and fragments on the heat sink.
- Check all naked wires for insulation damage (sun exposure, frictional wear, dryness, insects, rats). Repair or replace if necessary.
- Tighten all terminals. Inspect for loose, broken, or burnt wire connections.
- Check and confirm that LED indicators are consistent with requirements. Pay attention to any troubleshooting or error indications and take corrective action.
- Confirm that all system components are ground connected tightly and correctly.
- Confirm that all terminals have no corrosion, insulation damage, high temperature, or burnt/discolored signs. Tighten terminal screws to the suggested torque.
- Clear dirt, nesting insects, and corrosion in time.
- Check and confirm that the lightning arrester is in good condition. Replace a new one in time to avoid damaging the controller and other equipment.
WARNING:
Risk of electric shock! Ensure all power is turned off before performing maintenance operations.
9. Technical Specifications
The following tables detail the electrical, mechanical, and environmental parameters for the EPEVER MPPT Solar Charge Controllers XTRA-N G3/G3 BLE series.
9.1 Electrical Parameters
| Item | XTRA3215N G3/G3 BLE | XTRA4215N G3/G3 BLE | XTRA3415N G3/G3 BLE | XTRA4415N G3/G3 BLE |
|---|---|---|---|---|
| Battery Rated Voltage | 12/24VDC Auto | 12/24/36/48VDC Auto | ||
| Rated Charging Current | 30A | 40A | 30A | 40A |
| Rated Discharging Current | 30A | 40A | 30A | 40A |
| Controller Work Voltage Range | 8~31V | 8~62V | ||
| PV Maximum Open-circuit Voltage | 150V (At minimum operating environment temperature) 138V (At 25°C environment temperature) | |||
| MPPT Voltage Range | (Battery voltage+2V)~108V | |||
| Rated Charging Power | 390W/12V 780W/24V | 520W/12V 1040W/24V | 390W/12V 780W/24V 1170W/36V 1560W/48V | 520W/12V 1040W/24V 1560W/36V 2080W/48V |
| Maximum Conversion Efficiency | 97.6% | 97.9% | 98.1% | 98.5% |
| Maximum Load Efficiency | 95.1% | 95.4% | 96.9% | 97.2% |
| Static Losses (Enable com. port) | ≤15mA(12V) ≤9mA(24V) | ≤15mA(12V) ≤9mA(24V) | ≤14mA(12V) ≤9mA(24V) ≤8mA(36V) ≤7mA(48V) | ≤14mA(12V) ≤9mA(24V) ≤8mA(36V) ≤7mA(48V) |
| Static Losses (Disable com. port) | ≤8mA(12V) ≤5mA(24V) | ≤8mA(12V) ≤5mA(24V) | ≤8mA(12V) ≤5mA(24V) ≤5mA(36V) ≤5mA(48V) | ≤8mA(12V) ≤5mA(24V) ≤5mA(36V) ≤5mA(48V) |
| Discharge-circuit Voltage Drop | ≤0.23V | |||
| Temperature Compensation | -3mV/°C/2V (Default) | |||
| Grounding Type | Common negative | |||
| RS485 Port | 5VDC/200mA (RJ45) | |||
| LCD Backlight Time | Default: 60S, Range: 0~999S (0S: backlight ON all the time) | |||
9.2 Mechanical Parameters
| Item | XTRA3215N G3/G3 BLE | XTRA4215N G3/G3 BLE | XTRA3415N G3/G3 BLE | XTRA4415N G3/G3 BLE |
|---|---|---|---|---|
| Dimension (L x W x H) | 255×185×67.8mm | 255×187×75.7mm | 255×187×75.7mm | 255×189×83.2mm |
| Mounting Size (L x W) | 200×176mm | 200×178mm | 200×178mm | 200×180mm |
| Mounting Hole Size | Φ5mm | |||
| Terminal | 6AWG(16mm²) | 6AWG(16mm²) | 6AWG(16mm²) | 6AWG(16mm²) |
| Recommended Wire Size | 8AWG(10mm²) | 6AWG(16mm²) | 8AWG(10mm²) | 6AWG(16mm²) |
| Net Weight | 1.66kg | 2.08kg | 2.16kg | 2.60kg |
9.3 Environmental Parameters
| Item | XTRA1206/2206/1210/2210/3210/4210N G3/G3 BLE | XTRA3215/4215/3415/4415N G3/G3 BLE |
|---|---|---|
| Work Temperature Range | -25°C~+50°C | -25°C~+45°C |
| Storage Temperature Range | -20°C~+70°C | |
| Relative Humidity | ≤95%, N.C. | |
| Enclosure | IP33 (3-protection against solid objects: protected against solids objects over 2.5mm. 3-protected against sprays to 60° from the vertical.) | |
| Pollution Degree | PD2 | |
10. Conversion Efficiency Curves
The following graphs illustrate the conversion efficiency of the controllers under various conditions. For detailed analysis and specific model curves, please refer to the full user manual PDF.
10.1 XTRA4215N G3/XTRA4215N G3 BLE
Figure 6: 13V Conversion Efficiency Curves (XTRA4215N G3/G3 BLE)
Figure 7: 26V Conversion Efficiency Curves (XTRA4215N G3/G3 BLE)
10.2 XTRA4415N G3/XTRA4415N G3 BLE
Figure 8: 39V Conversion Efficiency Curves (XTRA4415N G3/G3 BLE)
Figure 9: 52V Conversion Efficiency Curves (XTRA4415N G3/G3 BLE)
11. Warranty and Support
For detailed warranty information, technical support, and a complete version of the user manual, please refer to the official EPEVER documentation. The full user manual is available in PDF format for download.
Download User Manual (PDF): EPEVER MPPT Solar Charge Controller User Manual (PDF)
For any issues not covered in this manual, please contact EPEVER customer support or your local distributor.
