1. Introduction
The SRNE RM-6 LCD Display unit is a remote meter designed for real-time monitoring and parameter setting of compatible SRNE MPPT solar charge controllers. This unit provides a convenient interface to view system data and adjust various parameters without direct interaction with the main controller.
2. Product Features
- LCD Graphical Main Menu: Enables easy viewing of complete operating data of the solar system in real-time.
- Simple Two-Button Design: Combines aesthetic appearance with easy operation for menu viewing and parameter setting.
- No External Power Supply: The unit is directly powered by the controller via the communication cable, eliminating the need for an additional power source.
- Embedded Installation: Designed for seamless integration into control panels or enclosures.
- Industrial Grade Design: Ensures durability and reliable performance in various harsh outdoor environments.
- Real-time Monitoring: Provides continuous monitoring of the controller's operating status and data.
3. Technical Specifications
| Parameter | Value |
|---|---|
| Model | RM-6 |
| Applicable Controller Models | MC2420N10, MC2430N10, MC2440N10, MC2450N10 (20A, 30A, 40A, 50A versions) |
| 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 (L*W*H) | 104.5mm * 55.5mm * 11.8mm |
| Certification | CE |
4. Installation
The RM-6 LCD Display unit is designed for embedded installation. Ensure you have a suitable cutout in your panel or enclosure for mounting.
4.1 Installation Dimensions
The required installation dimensions are 96mm x 53mm.
4.2 Connection
Connect the RM-6 unit to your compatible SRNE MPPT solar charge controller using the provided 1.5M communication cable. The unit will draw power directly from the controller.
5. Operating Instructions
The RM-6 unit features a simple two-button interface for navigation and parameter adjustment.
5.1 Button Operations
- SELECT Button: Used for menu/parameter switching.
- ENTER Button: Used for parameter setting/adjusting.
5.2 LCD Menu Overview
The LCD features a graphical main menu with various indicators:
- Solar panel indication
- Charge indication
- USB output indication
- Load output indication
- Battery voltage
- Charging current
- Load current
- Parameter setting
- Unit display area
- System voltage
- Battery type area
Menu Viewing:
The display shows different information depending on whether the controller is unloaded or loaded.
- Unloaded Controller Menu: Main interface (Solar panel voltage, Battery voltage, Battery capacity, Charging current), Error code (E0), Controller temperature, Charging AH.
- Loaded Controller Menu: Main interface (Solar panel voltage, Battery voltage, Battery capacity, Charging current), Error code (E0), Controller temperature, Charging AH, Load power, Load current.
5.3 System Parameter Settings
To enter and adjust system parameters:
- In any menu, press and hold the ENTER button to enter the "Parameter Settings" menu.
- Press the ENTER button to adjust the parameter value.
- Press the SELECT button to switch between different setting items.
- Press and hold the ENTER button for 2 seconds to save the settings and exit the menu.
- To select the battery type (LED/GEL/SLD/LI), press the SELECT button to cycle through the options in the "Battery type" menu.
- If you select "USE" for a customized battery type, use the SELECT button to navigate through and adjust parameters such as "Over-discharge voltage", "Equalizing charge voltage", "Boost charge voltage", "Floating charge voltage", and "Over-discharge return voltage".
Controlling Load On/Off (for controllers with load):
Under any menu, press the ENTER button to toggle the load on or off.
Important Notes:
- After changing the "System Voltage", it is required to power up the controller again for the changes to take effect.
- Exercise caution when defining custom parameters. Incorrect settings can lead to system malfunction.
User-Defined USE Menu Parameters:
| No. | LCD Display | Setting Items | Parameter Range | Notes |
|---|---|---|---|---|
| 1 | USE | Battery type | 12V/24V | "12V,24V" light flashes at the same time, "USE" automatic identification. |
| 2 | 12V/24V | System voltage | 12V/24V | |
| 3 | EQUALIZE | Equalizing charge voltage (USE) | 9.0~17.0V | |
| 4 | BOOST | Boost charge voltage (USE) | 9.0~17.0V | |
| 5 | FLOAT | Floating charge voltage (USE) | 9.0~17.0V | |
| 6 | LOW | Low voltage disconnection voltage (USE) | 9.0~17.0V | |
| 7 | LOW | Low voltage disconnection voltage (USE) | 9.0~17.0V |
6. Maintenance
The SRNE RM-6 LCD Display unit is designed for durability and requires minimal maintenance. To ensure optimal performance and longevity:
- Keep the display clean using a soft, dry cloth. Avoid abrasive cleaners or solvents.
- Ensure the communication cable connections are secure and free from damage.
- Operate the unit within its specified temperature and altitude ranges.
- Protect the unit from direct impact or excessive vibration.
7. Troubleshooting
This section provides solutions for common issues and explanations for error codes.
7.1 Error Code Display
| Error Code | Description | Result of Execution |
|---|---|---|
| E0 | No exception | System normal |
| E1 | Battery over discharge | Disable load output |
| E2 | Battery over voltage | Do not charge |
| E3 | Battery under-voltage warning | If battery voltage is lower than the under voltage warning threshold, the load output will be disconnected, and the system is normal. |
| E4 | Load short circuit | The load is turned off, and the maximum recovery is 3 times a day. |
| E5 | Load over-current | The load power is too large. Reduce the load power, and the load will be turned off. |
| E6 | Controller internal over-temperature | The intelligent linear power charging PWM controller turns off charging. |
| E7 | Battery over temperature | Turn off charging and discharging, and automatically recover when the voltage is below a certain value. |
| E8 | Solar panel input power over-voltage | The MPPT controller charges at a lower voltage, and the system is normal. |
| E9 | Solar panel over-voltage | Solar panel over-voltage, turn off charging, and automatically recover when the voltage is lower than the set value. |
| E10 | Solar panel reverse polarity | Do not charge |
| E15 | Battery not connected or lithium battery fixed | A long time without battery voltage exceeds the charging condition, the lithium battery is not activated, or the battery acid does not have a voltage output. |
| E16 | Battery over temperature | Do not charge and disable load output. |
| E17 | Battery low temperature | Disable load output. |
| E18 | BMS overcharge protection | Do not charge. |
| E19 | Battery low temperature | Do not charge. |
| E20 | Battery over discharge | Do not charge and disable load output. |
| E21 | Output capacitor over-voltage | Do not charge. |
Note: Not every controller has the above error code. For details, please refer to the corresponding controller manual.
7.2 Common Problems and Handling Methods
| Phenomena | Handling Methods |
|---|---|
| LCD screen not lit | Check if the battery and solar panel are properly connected. |
| LCD screen shows no battery set in the system | When the battery is not connected, there is no voltage output at the battery terminal, or the battery is not activated, the system will not work normally. |
| Error code E1 is displayed | Check if it is set to the corresponding system voltage, or if the battery type is set to the corresponding battery type. If the battery type needs to be changed, it needs to be restarted to take effect. |
| Battery icon indicator flashes | System over-voltage, check why battery voltage is too high. |
| Load indicator icon flashes | System over-voltage, load short circuit, overload and over-current, check why load voltage is too high. |
| E4 code is displayed | 1. Check if the load is short-circuited. After short-circuit is removed, the system will automatically recover. 2. It always shows E4. But it is not a problem. It is normal, and the system will automatically recover the limit number of recoverable times per day. |
| No data on the screen | Check poor communication, check the communication line. |
8. User Tips
- Battery Type Settings: If you are replacing your battery bank (e.g., from lead-acid to lithium iron phosphate), ensure you use the RM-6 to update the controller's battery type settings accordingly. The controller needs to be powered up again after changing 'System Voltage' for these settings to take effect.
- Parameter Verification: Always double-check custom parameter settings to prevent system malfunctions.
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your SRNE MPPT solar charge controller or contact SRNE customer service directly. Keep your purchase receipt for warranty claims.