1. Introduction
This manual provides comprehensive instructions for the safe and efficient use of your Offgridtec PWM Pro 12V/24V 10A USB Solar Charge Controller. Please read this manual thoroughly before installation and operation to ensure optimal performance and longevity of the device.
The Offgridtec PWM Pro charge controller is designed to manage the power flow from your solar panels to your battery bank, preventing overcharging and deep discharging, thereby extending battery life. It features a Pulse Width Modulation (PWM) charging algorithm, an LCD display for system monitoring, and USB outputs for charging small electronic devices.
2. Product Overview and Features
The Offgridtec PWM Pro 12V/24V 10A USB Solar Charge Controller is a robust and user-friendly device for off-grid solar systems. Key features include:
- PWM Charging: 3-level PWM charge regulation ensures gentle and efficient charging of your batteries.
- Battery Compatibility: Supports 12V and 24V battery systems with automatic voltage detection. Compatible with AGM, GEL, and Liquid Lead-acid battery types.
- System Capacity: Maximum charge current of 10A. Supports up to 130W PV input for 12V systems and 260W for 24V systems.
- Integrated Protections: Comprehensive protection against PV short circuit, PV reverse polarity, battery overcharge, battery deep discharge, overheating, and load output short circuit.
- User Interface: Large LCD display for real-time monitoring of PV input, battery status, load status, and energy values (kWh meter). Intuitive operation via two buttons (MENU, SET).
- USB Outputs: Two 5V USB ports with a total maximum output of 2.4A for charging mobile devices.
- Configurable Load Output: Allows for various load control settings, including light control functions.
- Temperature Compensation: Features temperature-compensated battery charging (requires an optional temperature sensor, not included).
Figure 1: Front view of the Offgridtec PWM Pro 12V/24V 10A USB Solar Charge Controller.
Figure 2: Key components and features of the charge controller, including LCD display, USB ports, control buttons, temperature sensor connection, and terminal blocks.
Figure 3: Physical dimensions of the charge controller: 142mm (L) x 85mm (W) x 41.5mm (H).
3. Safety Instructions
Please observe the following safety precautions during installation and operation:
- Ensure all connections are correct and secure before applying power. Incorrect wiring can damage the controller and other components.
- Always connect the battery first, then the solar panel, and finally the load. Disconnect in the reverse order.
- Do not exceed the maximum input voltage or current ratings of the controller.
- Install the controller in a well-ventilated area, away from direct sunlight, high temperatures, and moisture.
- Ensure proper grounding for the entire solar system.
- Wear appropriate personal protective equipment (PPE) such as gloves and eye protection during installation.
- Keep children away from the solar system components.
- Do not attempt to repair or modify the controller yourself. Contact qualified personnel for service.
4. Installation and Setup
4.1 Mounting the Controller
Mount the charge controller vertically on a non-flammable surface in a dry, well-ventilated indoor location. Ensure there is sufficient clearance around the controller for heat dissipation. Use appropriate screws for mounting through the designated holes.
4.2 Wiring Connections
Follow the connection order precisely to avoid damage to the controller or other components. The recommended cable cross-section is up to 4 mm².
- Connect the Battery: Connect the positive and negative terminals of the battery to the corresponding battery terminals on the charge controller. Ensure correct polarity. The controller will automatically detect the system voltage (12V or 24V).
- Connect the Solar Panel: Connect the positive and negative terminals of your solar panel(s) to the corresponding PV terminals on the charge controller. Ensure correct polarity.
- Connect the DC Load: Connect the positive and negative terminals of your DC load to the corresponding load terminals on the charge controller. Ensure 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.
Figure 4: Connection sequence: 1. Battery, 2. Solar Panel, 3. DC Load. The diagram also illustrates optional inverter connection for AC loads.
4.3 Battery Type Setting
The controller supports three battery types: AGM, GEL, and Liquid Lead-acid. It is crucial to select the correct battery type for optimal charging and battery longevity.
Figure 5: The charge controller supports GEL, VRLA (Lead-acid), and AGM battery types.
To set the battery type:
- Press the "SET" button to enter the battery type selection menu.
- Use the "MENU" button to cycle through the available battery types (e.g., b01 for GEL, b02 for AGM, b03 for Liquid Lead-acid).
- Press the "SET" button again to confirm your selection.
Refer to your battery's specifications for the correct type.
5. Operation
5.1 LCD Display Overview
The large LCD display provides real-time information about your solar system's status.
Figure 6: The LCD display shows Panel status, Battery status, and Load status, along with energy values.
The display typically shows:
- PV Status: Indicates solar panel activity and charging.
- Battery Status: Shows battery charge level and voltage.
- Load Status: Indicates if the load output is active.
- Energy Values: Displays accumulated kWh.
5.2 Button Functions
The controller is operated using two buttons: "MENU" and "SET".
- MENU Button: Used to navigate through different display screens and menu options.
- SET Button: Used to enter settings menus, confirm selections, and adjust parameters.
5.3 Load Output Configuration
The load output can be configured for various operating modes, such as 24-hour operation, dusk-to-dawn lighting, or timed operation. Refer to the detailed instructions in the included manual for specific programming steps.
5.4 USB Charging Ports
The two 5V USB ports provide a convenient way to charge small electronic devices. The total maximum output current for both ports combined is 2.4A. These ports are active when the controller is powered.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your charge controller and solar system:
- Check Connections: Periodically inspect all wiring connections for tightness and corrosion. Tighten any loose connections.
- Clean Controller: Keep the controller clean and free from dust and debris. Use a dry cloth for cleaning. Do not use liquids.
- Ventilation: Ensure that the ventilation openings are not blocked to allow for proper heat dissipation.
- Battery Inspection: Regularly check your battery bank for signs of damage, corrosion, or electrolyte levels (for liquid lead-acid batteries).
- System Performance: Monitor the LCD display for any unusual readings or error codes.
7. Troubleshooting
This section addresses common issues you might encounter with your charge controller.
| Problem | Possible Cause | Solution |
|---|---|---|
| No display on LCD | Battery not connected or low voltage; reverse polarity. | Check battery connections and voltage. Ensure correct polarity. Charge battery if voltage is too low. |
| Battery not charging | Solar panel not connected; insufficient sunlight; PV reverse polarity; PV short circuit. | Check solar panel connections and polarity. Ensure panels are exposed to adequate sunlight. Check for PV short circuits. |
| Load not working | Load disconnected; load short circuit; battery low voltage; load output disabled in settings. | Check load connections. Check for load short circuits. Ensure battery voltage is sufficient. Verify load output settings. |
| Overcharge protection active | Battery fully charged; incorrect battery type setting. | This is normal operation when the battery is full. Verify the correct battery type is selected. |
| Over-discharge protection active | Battery voltage too low. | Charge the battery using solar panels or an external charger. Reduce load consumption. |
If the problem persists after attempting these solutions, please contact Offgridtec customer support.
8. Specifications
| Parameter | Value |
|---|---|
| Model Number | 10910 |
| System Voltage | 12V / 24V Auto-detection |
| Max. Charge Current | 10A |
| Max. PV Input Power (12V System) | 130W |
| Max. PV Input Power (24V System) | 260W |
| Max. PV Open Circuit Voltage (12V System) | 22V |
| Max. PV Open Circuit Voltage (24V System) | 50V |
| USB Output | 2x 5V, Max 2.4A (Total) |
| Battery Types Supported | AGM, GEL, Liquid Lead-acid |
| Dimensions (L x W x H) | 142 x 85 x 41.5 mm (5.59 x 3.34 x 1.63 inches) |
| Weight | 300 grams |
| Max. Cable Section | 4 mm² |
| Display Type | LCD |
| Material | Plastic |
| Color | White |
| Manufacturer | Offgridtec GmbH |
| Country of Origin | China |
9. Warranty and Support
Offgridtec products are manufactured to high-quality standards. For warranty information and technical support, please refer to the warranty card included with your product or visit the official Offgridtec website. Please have your model number (10910) and purchase details ready when contacting support.
For further assistance, you may also contact your retailer.
