1. Product Overview
The SRNE SR-HP2420 is an advanced Pulse Width Modulation (PWM) solar charge controller designed to manage power flow from your solar panel to your battery and load. It automatically recognizes 12V/24V system voltages and incorporates a 3-stage charging algorithm to optimize battery life. This controller features a user-friendly LCD screen for convenient operation and includes multiple protection functions to ensure system safety.
Figure 1: SRNE SR-HP2420 Solar Charge Controller
Key Features:
- Automatic 12V/24V system voltage recognition.
- Upgraded 3-stage PWM charging algorithm (equalizing, boost, floating) to prevent non-equalization and sulfuration, extending battery service life.
- Temperature compensation for automatic adjustment of charging parameters.
- Wide range of load working modes for diverse applications.
- Comprehensive protection: overcharge, over-discharge, overload, and short-circuit protection.
- Advanced load starting method for smooth operation with large-capacitance loads.
- Dot matrix graphic LCD screen and single-key human-machine interface.
- User-friendly browser and dynamic interfaces for convenient and intuitive operations.
- Industrial-grade design for reliable function in tough conditions.
- TVS lighting protection.
2. Panel Structure and Connections
Familiarize yourself with the controller's panel structure before proceeding with installation.
Figure 2: Controller Panel Structure
Connection Terminals:
- Solar Panel Input: Connect your solar panel array here.
- Battery Terminals: Connect to your battery bank.
- Load Output: Connect your DC loads here.
- USB Port: Provides 5V 1A output for charging small devices.
- LCD Screen: Displays system status and parameters.
- Key: For navigating menus and adjusting settings.
- Mounting Holes: For securing the controller.
3. Setup and Installation
Follow these steps carefully to ensure proper and safe installation of your solar charge controller.
3.1 Mounting the Controller
- Choose a dry, well-ventilated location, away from direct sunlight and moisture.
- Ensure there is sufficient space around the controller for air circulation to prevent overheating.
- Use the mounting holes on the controller to secure it to a flat surface using appropriate screws.
3.2 Wiring Connections
WARNING: Ensure all power sources (solar panels and battery) are disconnected before making any connections to the controller.
- Connect the Battery: Connect the positive and negative terminals of your battery bank to the corresponding battery terminals on the controller. Observe correct polarity. The controller LCD should light up.
- Connect the Solar Panel: Connect the positive and negative terminals of your solar panel array to the corresponding solar panel input terminals on the controller. Observe correct polarity.
- Connect the Load: Connect your DC loads to the corresponding load output terminals on the controller. Observe correct polarity.
Important: Always connect the battery first, then the solar panel, and finally the load. Disconnect in the reverse order: load, then solar panel, then battery.
4. Operating Instructions
The SRNE SR-HP2420 controller is designed for intuitive operation via its LCD screen and single control key.
4.1 LCD Display
The LCD screen provides real-time information about your solar system, including battery voltage, charging current, load status, and various parameters. Use the key to browse through different display screens.
4.2 Setting Parameters
The controller automatically recognizes 12V/24V systems and adjusts charging parameters with temperature compensation. Advanced settings, such as load working modes, can be configured via the user interface. Refer to the on-screen menus for specific adjustments.
4.3 Load Control
The controller offers various load working modes. These modes dictate when the load output is active (e.g., dusk-to-dawn, timed operation). Consult the controller's display menus to select and configure the desired load mode.
5. Maintenance
Regular maintenance ensures optimal performance and longevity of your solar charge controller and overall system.
- Cleanliness: Keep the controller clean and free from dust and debris. Use a dry cloth for cleaning.
- Connections: Periodically check all wiring connections for tightness and corrosion. Loose connections can cause voltage drops and overheating.
- Ventilation: Ensure the area around the controller remains well-ventilated to prevent heat buildup.
- Battery Health: The 3-stage PWM charging with equalizing charge helps maintain battery health. Monitor battery voltage and performance regularly.
6. Troubleshooting
The SRNE SR-HP2420 includes built-in protections to handle common issues. If you encounter problems, check the following:
- No Display/Power:
- Check battery connections and ensure correct polarity.
- Verify battery voltage is within the operating range (12V/24V).
- No Charging:
- Check solar panel connections and polarity.
- Ensure solar panels are receiving adequate sunlight.
- Verify solar panel voltage is within specifications.
- Load Not Working:
- Check load connections and polarity.
- Ensure the load working mode is correctly configured.
- Verify battery voltage is above the over-discharge voltage.
- Check for overload or short-circuit conditions on the load output.
- Protection Activated: The controller will automatically protect against overcharge, over-discharge, overload, short-circuit, and reverse-connection. Identify the cause of the protection activation and rectify it before resuming operation.
7. Specifications
Below are the technical specifications for the SRNE HP2420 model.
Figure 3: Technical Data Sheet
| Parameter | HP2420 Specification |
|---|---|
| Model Number | SRNE HP2420 |
| Rated Current | 20A |
| Current display function | NO |
| System voltage | Automatic recognition of 12 V / 24 V |
| No-load loss | < 10mA/12V; < 12mA/24V |
| Max. Solar energy input voltage | < 55V |
| Max. voltage at the battery end | < 35V |
| Overvoltage protection | 17.0V; ×2/24V |
| Equalizing charging voltage | 14.6V; ×2/24V |
| Boost charging voltage | 14.4V; ×2/24V |
| Floating charging voltage | 13.8V; ×2/24V |
| Charging recovery voltage | 13.2V; ×2/24V |
| Over-discharge recovery voltage | 12.6V; ×2/24V |
| Over-discharge voltage | 11.1V; ×2/24V |
| Equalizing charging interval | 30 days |
| Equalizing charging time | 1H |
| Boost charging time | 2H |
| Temperature compensation | -3.0mV/°C/2V |
| Light control voltage | Light control on 5V, ×2/24V; light control off 6V, ×2/24V |
| Light control judgment time | 1 minute |
| Operating temperature | -25°C to +55°C |
| IP protection degree | IP30 |
| Net weight | 160g |
| Protection functions | Over-temperature, overload and short circuit protection, Solar panel short circuit and reverse-connection protection. |
| Dimensions | 130×75×38mm |
8. User Tips
- System Sizing: Ensure your solar panel array and battery bank are appropriately sized for your energy needs and compatible with the controller's specifications (e.g., max input voltage, rated current).
- Wire Gauge: Use appropriate wire gauges for all connections to minimize voltage drop and ensure safety.
- Fuse Protection: Consider adding external fuses for additional protection on the battery and solar panel lines, if not already integrated into your system.
- Environmental Factors: While the controller has IP30 protection, avoid exposing it to direct water spray or extreme dust to prolong its lifespan.
9. Warranty and Support
For warranty information and technical support, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.