Offgridtec MPPT Pro Duo 12V/24V 30A Solar Charge Controller User Manual

1. Introduction

The Offgridtec MPPT Pro Duo is a high-efficiency Maximum Power Point Tracking (MPPT) solar charge controller designed to optimize power harvest from your solar panels and efficiently charge two independent battery banks. This manual provides essential information for the safe installation, operation, and maintenance of your MPPT Pro Duo controller.

2. Safety Instructions

Please read all instructions carefully before installation and operation. Failure to follow these instructions may result in serious injury, damage to the controller, or other property damage.

• Installation should only be performed by qualified personnel with knowledge of electrical systems and safety procedures.
• Ensure all power sources, including solar panels and batteries, are disconnected before installation or maintenance.
• Always use appropriate tools and personal protective equipment (PPE) during installation.
• Do not disassemble or attempt to repair the controller. Contact Offgridtec support for service.
• Install the controller in a well-ventilated area, away from flammable materials and direct sunlight.
• Ensure proper wiring and fuse protection for all connections to prevent overcurrent and short circuits. Incorrect wiring can lead to fire hazards.
• The controller is designed for specific battery types. Verify your battery type before connecting and setting parameters.

3. Product Overview

The Offgridtec MPPT Pro Duo is a robust and high-quality solar charge controller featuring a metal housing that also serves as a heat sink. It is designed for both 12V and 24V systems.

3.1 Key Features

• MPPT technology for maximum power harvest.
• Dual battery charging capability (Batt1 for house battery, Batt2 for starter battery).
• Supports multiple battery types for Batt1: Gel, Flooded, LiFePO4, and Li-NiCoMn.
• Supports Lead-Acid battery for Batt2.
• LED status indicators for operational feedback.
• Integrated SET button for battery type configuration.
• RS485 communication port for external display or USB adapter.
• AES signal output for refrigerator control.
• Temperature sensor input (one integrated, one for external sensor).

3.2 Package Contents

• 1x Offgridtec MPPT Pro Duo Solar Charge Controller
• 2x Connection Terminals
• 1x User Manual (German/English)

3.3 Controller Components

Figure 1: Front View of MPPT Pro Duo Controller. This image shows the front panel of the Offgridtec MPPT Pro Duo solar charge controller, displaying the Offgridtec logo, LED indicators for BATT1 (MPPT, TEMP, State, LOW, AES SIGNAL, SEAL, GEL, FLD, LiFePO4, Li-NiCoMn), BATT2 STATE, BATT SEL MODE, and the SET button. The model name 'MPPT Pro Duo' is printed at the bottom.

Figure 2: Rear View of MPPT Pro Duo Controller. This image displays the back of the Offgridtec MPPT Pro Duo solar charge controller, highlighting the extensive cooling fins designed for efficient heat dissipation during operation.

Figure 3: Bottom Connections of MPPT Pro Duo Controller. This angled view of the Offgridtec MPPT Pro Duo solar charge controller shows the bottom section where the protective cover has been removed, revealing the screw terminals for connecting solar panels, Battery 1, and Battery 2.

Figure 4: MPPT Pro Duo Controller Dimensions. This image illustrates the physical dimensions of the Offgridtec MPPT Pro Duo solar charge controller, indicating a height of approximately 24.69 cm, a width of 16.51 cm, and a depth of 6.91 cm.

4. Setup and Installation

Proper installation is crucial for the safe and efficient operation of your MPPT Pro Duo controller. It is highly recommended to have the device installed by a qualified technician.

4.1 Mounting Location

• Mount the controller vertically on a non-flammable surface.
• Ensure adequate air circulation around the cooling fins at the back of the unit.
• Avoid locations exposed to direct sunlight, high temperatures, or moisture.

4.2 Wiring Sequence

Follow the wiring sequence below to prevent damage to the controller or batteries. Always connect and disconnect in the specified order.

1. Connect Battery 1: Connect the positive and negative terminals of Battery 1 (house battery) to the corresponding BATT1 terminals on the controller. Ensure correct polarity.
2. Connect Battery 2: Connect the positive and negative terminals of Battery 2 (starter battery) to the corresponding BATT2 terminals on the controller. Ensure correct polarity.
3. Connect Solar Panels: Connect the positive and negative leads from your solar panel array to the PV terminals on the controller. Ensure correct polarity and that the open-circuit voltage (Voc) of your solar array does not exceed 100V.
4. Connect Temperature Sensor: If using an external temperature sensor, connect it to the designated port. The controller also has an integrated sensor.
5. Grounding: Connect the grounding terminal of the controller to an earth ground.

Important: Always connect batteries first, then solar panels. Disconnect in the reverse order: solar panels first, then batteries.

4.3 Battery Type Setting

After connecting the batteries, you must set the correct battery type for Battery 1 using the SET button on the front panel. Battery 2 is fixed to Lead-Acid type.

• Press and hold the SET button for approximately 5 seconds until the battery type indicator for BATT1 starts flashing.
• Press the SET button repeatedly to cycle through the available battery types: SEAL (Sealed Lead-Acid), GEL, FLD (Flooded Lead-Acid), LiFePO4, Li-NiCoMn.
• Once the desired battery type is selected, wait for 5 seconds without pressing any button. The controller will automatically save the setting and exit the configuration mode.

5. Operating Instructions

Once installed and configured, the MPPT Pro Duo will automatically begin charging your batteries. Monitor the LED indicators for operational status.

5.1 LED Indicators

6. Maintenance

The Offgridtec MPPT Pro Duo is designed for minimal maintenance. However, regular checks can ensure optimal performance and longevity.

• Visual Inspection: Periodically inspect the controller for any signs of damage, corrosion, or loose connections.
• Cleanliness: Keep the controller clean and free from dust and debris. Ensure the cooling fins are not obstructed. Use a dry cloth for cleaning.
• Connection Checks: Annually, or as needed, verify that all wiring connections are secure and free from corrosion.
• Battery Health: Regularly check the health and charge level of your batteries, especially flooded lead-acid batteries which may require water replenishment.

7. Troubleshooting

If you encounter issues with your MPPT Pro Duo controller, refer to the following common troubleshooting steps. For more complex problems, contact Offgridtec support.

7.1 No Charging Activity

• Check Solar Panel Connection: Ensure solar panels are correctly connected to the PV terminals and receiving sufficient sunlight. Verify panel voltage.
• Check Battery Connections: Confirm both Battery 1 and Battery 2 are securely connected with correct polarity.
• Verify Battery Type: Ensure the correct battery type is selected for Battery 1. An incorrect setting can prevent proper charging.
• Insufficient Solar Input: If using a small solar panel (e.g., 100W), it might not provide enough power to charge two batteries effectively, especially if one is deeply discharged. Consider increasing solar capacity or prioritizing one battery.

7.2 Bluetooth/App Connectivity Issues (Optional Accessory)

• Reinstall App: Try uninstalling and reinstalling the Offgridtec app on your mobile device.
• Check Location Permissions: Ensure the app has location services permissions enabled on your device. This is often required for Bluetooth scanning.
• Verify Adapter Connection: Ensure the Bluetooth adapter (if used) is correctly connected to the RS485 port.
• Alternative Passwords: If prompted for a password, try common defaults or consult the adapter's specific manual.

8. Specifications

9. Warranty and Support

For warranty information and technical support, please contact Offgridtec GmbH directly. Details regarding specific warranty periods and terms are typically provided with your purchase documentation or on the manufacturer's official website.

When contacting support, please have your product model number (011200) and purchase details readily available.

Manufacturer: Offgridtec GmbH