1. Introduction
Thank you for choosing the SRNE MC Series MPPT Solar Charge Controller. This manual provides essential information for the safe and efficient operation of your controller. The MC series controllers utilize advanced PowerCatcher MPPT technology to maximize energy harvesting from solar panels, ensuring optimal charging for various battery types in 12V/24V solar home systems.
Key features of the SRNE MPPT Solar Charge Controller include:
- PowerCatcher MPPT Technology: Advanced Maximum Power Point Tracking algorithm for faster response and higher tracking efficiency (up to 99.9%), significantly increasing energy utilization efficiency (15-20% higher than traditional PWM charging).
- High Conversion Efficiency: Due to advanced digital power technology, the circuit energy conversion efficiency is as high as 98%.
- Battery Compatibility: Supports multiple battery types including lead-acid (colloidal, sealed, vented) and lithium batteries, with adjustable charging procedures.
- Current-Limited Charging: Automatically reduces charging power when solar panel power is too large or charging current exceeds the rated valve, ensuring safe operation.
- Automatic Voltage Identification: Supports automatic identification of lead-acid battery voltage (12V/24V auto).
- External Connectivity: External LCD screen (RM-6) or Bluetooth module (BT-2) can be connected for viewing operating data, status, and parameter modification.
- Modbus Protocol: Supports standard Modbus protocol for communication needs.
- Over-Temperature Protection: Built-in mechanism reduces charging current linearly with temperature increase to prevent high-temperature damage.
- Comprehensive Protections: Includes battery overcharge/over-discharge, PV reverse polarity, PV short-circuit, battery reverse polarity, night reverse charging, and TVS lightning protection.
Video: Overview of the SRNE MPPT Solar Charge Controller and its features.
2. Safety Instructions
Image: Safety instructions from the user manual, emphasizing precautions for installation and operation.
Please read and understand all safety instructions carefully before installation and operation to prevent injury or damage to the controller.
- The applicable voltage of the controller exceeds the safety voltage for human body. Read the manual carefully and operate only after safety operation training.
- The controller contains no user-serviceable parts. Do not disassemble or repair the controller.
- Install the controller indoors to prevent exposure to components and water ingress.
- Install the controller in a well-ventilated place to prevent the heat sink from overheating.
- It is recommended to install a proper fuse or circuit breaker outside the controller.
- Before installation or wiring adjustments, disconnect the PV array wiring and the fuse or circuit breaker near the battery terminal.
- Ensure all wiring is tight after installation to avoid heat accumulation due to poor connections.
⚠ Warning: This operation is dangerous. Safety preparations must be made before operation.
⚠ Caution: This operation may have a destructive effect.
ℹ Reminder: Suggestions and tips for operator.
3. Product Overview and Display
3.1 Controller Appearance and Ports
Image: Front view of the SRNE MPPT Solar Charge Controller, highlighting its ports and indicators.
| No. | Name | No. | Name |
|---|---|---|---|
| 1 | Solar panel + interface | 6 | Communication interface |
| 2 | Solar panel - interface | 7 | Operation keys |
| 3 | Battery + interface | 8 | PV charging indicator |
| 4 | Battery - interface | 9 | Battery capacity indicator |
| 5 | External temperature sampling interface | 10 | Battery type indicator |
3.2 LED Indicators
The controller features three indicators:
- PV array indicator: Indicates the current charging mode of the controller.
- BAT indication: Indicates the current state of the battery.
- BAT Type indication: Indicates the current battery type.
Image: Detailed explanation of the PV array, battery state, and battery type indicators on the controller.
PV Array Indicator
| No. | Charging Status | Indicator State | Charging State |
|---|---|---|---|
| ① | BULK | Steady on | MPPT charging |
| ② | ACCEPTANCE | Slow flashing | Boost charging |
| ③ | FLOAT | Quick flashing | Floating charging |
| ④ | EQUALIZING | Double flashing | Equalizing charging |
| ⑤ | CURRENT-LIMITED | Double flashing | Current-limited charging |
| ⑥ | Off | Off | No charging |
Battery State Indicator
| Indicator Color | Indicator Status | Battery Status |
|---|---|---|
| Green | Steady on | Battery full charge |
| Yellow | Steady on | Battery normal voltage |
| Yellow | Slow flash | Over-discharge |
| Red | Quick flash | Battery over voltage or over temperature |
Battery Type Indication
| Indicator Color | Battery Type |
|---|---|
| Green | Sealed lead-acid battery (SLD) |
| Yellow | Gel lead-acid battery (GEL) |
| Red | Flooded lead-acid battery (FLD) |
| Blue | 12V/24V lithium battery (LiFePO4) |
| Purple | 24V lithium battery (LiFePO4) |
| White | User (self-customized) |
4. Installation
4.1 Installation Precautions
Image: Installation precautions and wiring specifications from the user manual.
- Be very careful when installing the battery. When installing vented lead-acid batteries, wear safety glasses. If battery acid touches skin, rinse with clean water.
- Do not place metal objects near the battery to prevent short circuits.
- Ensure good ventilation as acid gas may be generated when the battery is charged.
- Keep away from sparks as the battery may generate flammable gas.
- Avoid direct sunlight and rainwater infiltration when installing outdoors.
- Ensure all connection points are tight and wires are secured (e.g., with cable ties) to prevent extreme heat, insulation damage, or fire due to poor connections or corrosion.
- Use insulated tools and ensure hands are dry when working with system wiring, as component output voltage may exceed safe human body voltage.
- The controller is suitable for lead-acid (colloidal, sealed, vented) and lithium batteries. Observe the battery manufacturer's recommendations.
- System connection wires should have a current density not exceeding 4mm².
- Ensure the controller is properly grounded.
4.2 Installation Steps
- Choose an installation location: Select a location free from direct sunlight, high temperatures, and water. Ensure adequate ventilation around the controller.
- Mark the mounting position: Use the controller's dimensions to mark four drilling points. Drill holes of appropriate size.
- Fasten the controller: Align the controller's fixing holes with the two pre-fixed upper screws and hang the controller. Then, secure the lower two screws.
5. Wiring
All wiring and installation must comply with national and local electrical code requirements. Select PV and battery connection wires according to the rated current. Refer to the wiring specifications table below.
⚠ Warning: Electric shock hazard! Ensure all power supplies to the controller are disconnected before inspection or operation.
⚠ Warning: High voltage! Photovoltaic arrays may generate very high open circuit voltages. Disconnect circuit breakers or fuses before wiring and proceed with extreme caution.
⚠ Warning: Explosion hazard! Short-circuiting positive and negative battery terminals or their connected wires can cause fire or explosion. Exercise extreme care during operation.
Wiring Sequence: Connect the battery first, and then the solar panel. Follow the positive (+) and negative (-) markings carefully.
Image: Wiring diagram for the solar charge controller, illustrating connections for solar panels, battery, and load, along with heat dissipation guidelines.
5.1 Wiring Specifications
| Model | Max. PV input power (12V/24V) | Max. wire diameter (PV end/BAT end) | Rated charge current | Battery wire diameter (BAT end) |
|---|---|---|---|---|
| MC2420N10 | 260W/520W | 10/7 | 20A | 10/7 |
| MC2430N10 | 400W/800W | 10/7 | 30A | 10/7 |
| MC2440N10 | 520W/1040W | 10/7 | 40A | 10/7 |
| MC2450N10 | 660W/1320W | 12/8 | 50A | 12/8 |
6. Operation
6.1 Key Operations
The controller has an operation key used for selecting battery types. Follow these steps:
- In the current operating state, press and hold the key for 8 seconds. The battery type indicator (showing the currently selected type) will start to flash, and the controller will stop charging.
- Each press of the key will cycle through the available battery types (indicated by a changing color).
- Once the desired battery type is selected, press and hold the key again for 8 seconds, or wait for 15 seconds without operation. The controller will automatically save the setting and resume normal operation.
- To restore factory default parameters, press and hold the key for 20 seconds.
7. Accessories
7.1 Bluetooth Module (BT-2)
The BT-2 Bluetooth module extends the communication capabilities of your SRNE solar controller, allowing wireless monitoring and parameter setting via a mobile phone application.
- Enables wireless monitoring of the solar controller.
- Supports mobile phone APP for plug-and-play setup and simple parameter configuration.
- Utilizes high-performance, low-power Bluetooth 4.0 and BLE technology for rapid communication and strong anti-jamming.
- Powered directly by the communication port, requiring no external power supply.
- Communication distance of up to 15 meters.
Image: The BT-2 Bluetooth module, its connection to the solar charge controller, and a diagram showing communication with a mobile phone app.
BT-2 Technical Parameters
| Parameter | Value |
|---|---|
| Input voltage | 5V-12V |
| Stand-by power consumption | 0.04W |
| Run power consumption | 0.05W |
| Communication distance | ≤15m |
| Serial port baud rate | Fixed baud rate 9600bps |
| Communication methods | TTL |
| Interface type | PH2.0 |
| Connecting line | Standard Ethernet cable (parallel line) |
| Size | 67.3*36*15.5mm |
| Installation dimension | 57.8*12mm |
| Fixed holes dia | φ3.5 |
| Operating temperature | -20℃-75℃ |
| Level of protection | IP67 |
| Net weight | 120g |
7.2 Remote Meter (RM-6)
The RM-6 remote meter provides an LCD graphical main menu for real-time monitoring of controller data and operating status. It features a two-button design for easy menu viewing and parameter setting.
- LCD graphical main menu for real-time data monitoring.
- Two-button design for easy menu navigation and parameter setting.
- No external power supply required; powered directly by the controller via communication cable.
- Embedded installation for a clean setup.
- Industrial-grade design suitable for harsh environments.
Image: The RM-6 Remote Meter, showing its LCD display, select and enter buttons, and connection cable.
RM-6 Technical Parameters
| Parameter | Value |
|---|---|
| Model | RM-6 |
| Applicable models of controller | 50A/40A/30A/20A |
| Input voltage | 5V-12V |
| Standby power consumption | < 0.03W |
| Operating power consumption | < 0.04W |
| Fixed baud rate | 9600bps |
| Communication mode | TTL |
| Interface type | PH2.0 |
| Connection cable length | 1.5M |
| Operating temperature | -35℃ ~ +65℃ |
| IP rating | IP32 |
| Weight | 50g |
| Altitude | ≤ 3000M |
| Dimensions | 104.5*55.5*11.8mm |
8. Troubleshooting
8.1 Error Code Display
Image: Error code table from the user manual, detailing error codes, their descriptions, and the resulting actions.
8.2 Common Problems and Handling Methods
- Battery Reverse Polarity Protection: If the battery polarity is reversed, the system will not work but the controller will not be damaged. Correct the wiring.
- PV Input Voltage Too High: If the voltage at the PV array input end is too high, the controller will automatically shut off the PV input. Reduce PV array voltage or check system configuration.
- PV Input Short Circuit Protection: If the PV array input is short-circuited, the controller will stop charging. Charging will resume automatically once the short circuit is removed.
- PV Input Reverse Polarity Protection: When the polarity of PV array is reversed, the controller will not be damaged, and normal operation will resume after the wiring error is corrected.
- Night Reverse Charging Protection: The controller prevents battery discharge through the solar panel at night.
- TVS Lightning Protection: The controller includes TVS lightning protection.
- Over-temperature Protection: If the controller's temperature exceeds the set value, it will reduce charging power or stop charging to prevent damage. Ensure adequate ventilation.
9. Specifications
9.1 Electrical Parameters
Image: Electrical parameters table for various models of the SRNE MPPT Solar Charge Controller.
| Item | MC2420N10 | MC2430N10 | MC2440N10 | MC2450N10 |
|---|---|---|---|---|
| Battery voltage | 12V/24V | |||
| Max. PV open circuit voltage | 92V (25°C) / 100V (lowest ambient temperature) | |||
| Charge current | 20A | 30A | 40A | 50A |
| Solar panel power (12V battery) | 260W | 400W | 520W | 660W |
| Solar panel power (24V battery) | 520W | 800W | 1040W | 1320W |
| MPPT tracking efficiency | > 99% | |||
| Conversion efficiency | > 95% | |||
| Temperature compensation | -3mV/°C/2V (default); Lithium battery features no temperature compensation | |||
| Operating temperature | -35°C ~ +60°C | |||
| IP rating | IP32 | |||
| Weight | 650g | 830g | 1040g | 1335g |
| Communication mode | TTL Serial communication | |||
| Altitude | ≤ 3000 meters | |||
9.2 Battery Type Default Parameters
Image: Default parameters for different battery types, including lead-acid (tested, gel, flooded) and lithium, with user-defined options.
9.3 Product Dimensions
Image: Dimensional drawings for MC2420N10, MC2430N10, MC2440N10, and MC2450N10 models, including outline and fixed hole dimensions.
10. Maintenance
Regular maintenance ensures optimal performance and longevity of your SRNE MPPT Solar Charge Controller. It is recommended to perform inspections twice a year.
- Ensure unobstructed airflow around the controller and clean any dirt or debris from the heat sink.
- Inspect all exposed wires for damage (sun exposure, friction, dry rot, insect/rodent damage). Repair or replace damaged wires as necessary.
- Verify that indicator lights correspond to device operations. Take corrective actions for any malfunctions or error indications.
- Check all wiring terminals for corrosion, insulation damage, signs of high temperature, or burning/discoloration.
- Tighten all terminal screws.
- Clean the controller for dirt, insects, and corrosion.
- If the lightning arrester is faulty, replace it promptly to protect the controller and other system devices.
- Address any malfunctions or error indications resulting from lightning operations.
11. User Tips
- Battery Compatibility: The controller is compatible with AGM batteries.
- Load Output: If you intend to connect a light or other DC load, ensure it is connected to the designated load output terminals on the controller. Refer to the wiring diagram in Section 5 for correct connection points.
12. Warranty and Support
For warranty information and technical support, please contact your vendor or the manufacturer directly. Keep your purchase receipt as proof of purchase.
For further assistance, please refer to the official SRNE website or contact their customer service.