1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Xijia 9-75V DC-DC Buck-Boost Power Controller. This device is a 4-terminal synchronous rectified BUCK/BOOST automatic step-up/step-down DC/DC converter controller. It automatically switches between BUCK (step-down) and BOOST (step-up) modes, whether the input voltage is higher, lower, or equal to the output voltage. Designed for high efficiency and smooth transitions between operating modes with low noise, it is ideal for automotive, industrial equipment, communication devices, and battery systems.
Please read this manual thoroughly before installation and operation to ensure safe and efficient use of the product.
2. Safety Information
WARNING: Improper installation or operation can lead to electric shock, fire, or damage to the device and connected equipment. Always follow these safety guidelines:
- Installation and use of this product require basic knowledge of electrical circuits. If you lack sufficient knowledge of electrical principles, energy conversion, or are unfamiliar with wiring, it is highly recommended to seek installation assistance from a qualified professional.
- Ensure all power sources are disconnected before making any electrical connections.
- Verify correct polarity for all connections (positive to positive, negative to negative). Incorrect polarity can cause severe damage.
- Do not exceed the maximum input voltage, output voltage, or current ratings specified in this manual.
- Install the device in a well-ventilated area to prevent overheating.
- Keep the device away from water, moisture, and flammable materials.
- Do not attempt to disassemble or modify the device. This will void the warranty and may cause hazards.
- Use appropriate wire gauges for all connections to handle the expected current.
3. Product Overview
The Xijia DC-DC Buck-Boost Power Controller is designed for efficient power management in various applications, including RVs, camping cars, and trucks, particularly for charging sub-batteries. It features a compact design, quiet cooling, and intelligent control functions.
3.1 Key Features
- One-Way Charging Function: Electrically isolates the main battery from the sub-battery, allowing one-way charging from the main battery to the sub-battery only. Prevents reverse current flow from the sub-battery to the main battery, protecting the vehicle's power system.
- Solar Panel Compatibility (Built-in MPPT): Features a built-in MPPT controller for efficient charging from solar panels. Achieves a maximum output current of 60A and a high conversion efficiency of up to 98%. Note: Battery charging input and solar panel input cannot be used simultaneously.
- ACC Control Function: Detects the ACC signal to initiate charging only when the engine starts. Automatically stops charging when the vehicle is parked, preventing over-discharge of the main battery. Ideal for RVs, camping cars, and trucks.
- Compact & Lightweight Design: Dimensions of 18cm (L) × 11.5cm (W) × 6.6cm (H) and a weight of only 1.3kg. Space-saving design allows for easy installation in vehicles or limited spaces.
- Quiet Cooling Design: Equipped with a long-life ball bearing fan for efficient heat dissipation while maintaining an operating noise level below 30dB. Ensures comfortable use inside vehicles.
3.2 Component Identification
Figure 1: Front view of the Xijia DC-DC Buck-Boost Power Controller. Shows the digital display, control buttons, and main housing.
Figure 2: Rear view of the Xijia DC-DC Buck-Boost Power Controller. Features the cooling fan, positive input terminal (red), and negative input terminal (black).
Figure 3: Overview of the Xijia DC-DC Buck-Boost Power Controller with key connection points labeled, including ACC input, ON/OFF switch, and input/output terminals.
The device features a digital display for monitoring voltage and current, control buttons for settings adjustment, and robust terminals for secure electrical connections. A cooling fan is integrated to manage internal temperatures during operation.
4. Specifications
| Feature | Specification |
|---|---|
| Brand | Xijia |
| Model Number | SP9-75V/60A |
| Input Voltage Range | 9-75V DC ±1% |
| Output Voltage Adjustment Range | 3-50V DC ±1% |
| Input Low Voltage Protection Setting | 0-75V DC ±1% |
| Input Overvoltage Protection Setting | 0-75V DC ±1% |
| Solar Voltage Tracking Setting | 0-75V DC ±1% |
| Startup Delay Time | Adjustable from 5-999 seconds |
| Operating Temperature Range | -30°C to 85°C |
| Storage Temperature Range | -40°C to 105°C |
| Product Weight | 1.3 kg |
| UPC | 732322484601 |
4.1 BUCK (Step-Down) Mode Characteristics
- Maximum Output Power: 900W
- Input Current Adjustment Range: 0-60A DC ±3%
- Output Current Adjustment Range: 0-60A DC ±3%
- Step-down Ratio: 2-25 times (VIN ÷ VOUT)
- Maximum Conversion Efficiency: 98%
4.2 BOOST (Step-Up) Mode Characteristics
- Maximum Output Power: 750W
- Input Current Adjustment Range: 0-60A DC ±3%
- Output Current Adjustment Range: 0-50A DC ±3%
- Step-up Ratio: 2-5 times (VOUT ÷ VIN)
- Maximum Conversion Efficiency: 95%
- Note: When operating at high step-up ratios (3-5 times), please adjust the rated output power by reducing the output current.
4.3 Temperature Protection Function
- Cooling fan starts at 45°C.
- Cooling fan stops below 40°C.
- Automatic shutdown at 90°C.
- Automatic recovery below 60°C.
5. Setup and Installation
Proper installation is critical for the safe and efficient operation of the power controller. Refer to Figure 3 for a visual guide to connection points.
5.1 Wiring Diagram (Conceptual)
While a detailed diagram is not provided here, the general connection principle involves:
- Main Battery Connection: Connect the input terminals of the controller to your vehicle's main battery. Ensure correct polarity (+ to +, - to -).
- Sub-Battery Connection: Connect the output terminals of the controller to your auxiliary (sub) battery. Maintain correct polarity.
- ACC Signal Connection: Connect the ACC input terminal to a switched 12V/24V source that is active when the engine is running (e.g., ignition switch). This enables the ACC control function.
- Solar Panel Connection (Optional): If using a solar panel, connect it to the designated solar input terminals. Remember: Solar input and main battery input cannot be used simultaneously for charging.
Important: Use appropriately sized cables for all connections to prevent overheating and ensure optimal performance. Consult an automotive electrician if you are unsure about wiring procedures.
5.2 Mounting
- Choose a dry, well-ventilated location for mounting the controller, away from direct sunlight, heat sources, and moisture.
- Ensure sufficient clearance around the device, especially near the cooling fan, for proper airflow.
- Secure the controller firmly using appropriate fasteners to prevent movement during vehicle operation.
6. Operating Instructions
Once installed, the Xijia Buck-Boost Power Controller operates largely automatically. However, understanding its functions and settings is important.
6.1 Power On/Off
- Ensure all connections are secure before powering on.
- The device will typically power on when the main battery is connected and the ACC signal is detected (if enabled).
- Use the ON/OFF switch (if present, refer to Figure 3) to manually control the power to the unit.
6.2 Display and Controls
The integrated digital display shows real-time information such as input voltage, output voltage, input current, and output current. Use the control buttons adjacent to the display to navigate menus and adjust settings. Specific button functions (e.g., UP, DOWN, SET, MODE) will be indicated on the device or in a separate quick-start guide.
6.3 Setting Parameters
The controller allows adjustment of various parameters, including:
- Output Voltage: Set the desired charging voltage for your sub-battery (3-50V DC).
- Input/Output Current Limits: Adjust current limits to match your battery and wiring specifications.
- Input Low/Overvoltage Protection: Configure these settings to protect your main battery from excessive discharge or overvoltage.
- Solar Voltage Tracking: If using solar, set the appropriate voltage tracking parameters.
- Startup Delay: Adjust the delay before charging begins after the ACC signal is detected.
Refer to the on-screen menu or a dedicated settings guide for detailed instructions on parameter adjustment.
6.4 Automatic Buck/Boost Operation
The device automatically detects the input and output voltage relationship and switches between Buck (step-down) and Boost (step-up) modes to maintain the set output voltage and current for optimal charging.
6.5 ACC Function
When the ACC function is enabled and correctly wired, the controller will only activate charging when the vehicle's engine is running (ACC signal present). This prevents draining the main battery when the vehicle's off.
7. Maintenance
The Xijia Buck-Boost Power Controller is designed for reliable operation with minimal maintenance. However, periodic checks can help ensure its longevity and performance.
- Cleaning: Periodically clean the exterior of the device with a soft, dry cloth. Ensure the cooling fan and vents are free from dust and debris to maintain proper airflow. Do not use liquid cleaners or solvents.
- Connection Checks: Annually, or if you notice any issues, inspect all electrical connections to ensure they are tight and free from corrosion. Loose connections can cause resistance, heat, and potential failure.
- Environmental Check: Ensure the mounting location remains dry and well-ventilated. Address any signs of moisture or excessive heat immediately.
- Firmware Updates: Check the manufacturer's website periodically for any available firmware updates, though this device typically does not require user-initiated updates.
Do not attempt to open the casing or perform internal repairs. Refer all servicing to qualified personnel.
8. Troubleshooting
If you encounter issues with your Xijia Buck-Boost Power Controller, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | No input voltage; incorrect wiring; blown fuse; ACC signal not detected. | Check main battery voltage. Verify all wiring connections, especially polarity. Check for blown fuses in the input line. Ensure ACC signal is present when engine is running. |
| No charging output to sub-battery. | Output voltage set too low; output current limit reached; sub-battery fully charged; ACC signal not active. | Check output voltage settings. Verify output current limit. Confirm sub-battery requires charging. Ensure ACC signal is active. |
| Overheating / Fan constantly running. | Insufficient ventilation; blocked fan/vents; excessive load. | Ensure adequate airflow around the device. Clean any dust or debris from the fan and vents. Reduce the load if possible. Check ambient temperature. |
| Display shows error code. | Input over/undervoltage; output overcurrent; over-temperature. | Refer to the device's on-screen error code guide (if available) or the specifications for protection thresholds. Address the underlying issue (e.g., correct input voltage, reduce load, improve cooling). |
| Solar charging not working. | Solar panel not connected; insufficient sunlight; main battery input active. | Verify solar panel connections and ensure adequate sunlight. Remember, solar input and main battery input cannot be used simultaneously. |
If the problem persists after attempting these solutions, please contact customer support.
9. Warranty and Support
9.1 Warranty Information
This Xijia product comes with a 1-year warranty from the date of purchase. The warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by improper installation, misuse, accidents, unauthorized modifications, or natural disasters.
Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For any questions, technical assistance, or warranty inquiries, please do not hesitate to contact the seller's customer service. Provide your product model number (SP9-75V/60A) and a detailed description of your issue to facilitate faster support.
Contact information can typically be found on your purchase receipt or the seller's platform page.