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      Troubleshooting GFI and Inverter Issues in Camper Vans

      Seeing error code #67 on your van’s touchscreen display or battery monitor? This guide will help you troubleshoot the issue step by step.

      Encountering error code #67 on your Victron GX Touch 50 battery monitor? This guide will help you troubleshoot the issue.

      Error #67 on Victron systems indicates a loss of communication between the Battery Management System (BMS) and other components, such as the MultiPlus inverter/charger or MPPT solar charge controllers. This issue can arise from various factors, including firmware mismatches, configuration errors, or hardware faults. To address this error, consider the following steps:

      1. Check Physical Connections:

        • Cabling: Ensure all communication cables between the BMS, Cerbo GX (or other GX devices), and connected components are securely connected and free from damage. Faulty or loose cables can disrupt communication.
        • Terminator Resistors: In CAN bus systems, proper termination is crucial. Some users have resolved Error #67 by installing a data bus terminator (an RJ45 plug with a resistor) into the second socket of the BMS-CAN RJ45 port.

      2. Verify Firmware Versions:

        • Updates: Ensure all devices have the latest firmware compatible with your system setup. Firmware updates often address known communication issues.
        • Downgrades: If the error began after a firmware update, consider reverting to a previous stable version. Some users have found that downgrading the Cerbo GX firmware resolved the issue.

      3. Review System Configuration:

        • Networked Operation Settings: On the MPPT charge controller, navigate to the settings and ensure that the "Networked Operation" mode is correctly configured. Incorrect settings can lead to communication errors.
        • DVCC Settings: In the Cerbo GX, under Distributed Voltage and Current Control (DVCC), verify that the BMS control settings align with your system's requirements. Disabling BMS control has helped some users maintain system stability.

      4. Inspect for Ground Loops:

        • Grounding: Improper grounding can cause communication issues. Establish a common ground point for all components to prevent potential differences that may disrupt communication.

      5. Monitor for Overheating:

        • Temperature: Overheating of devices like the Cerbo GX can lead to unexpected restarts, causing communication loss. Ensure adequate ventilation and monitor device temperatures to prevent overheating.

      6. Consider Hardware Replacement:

        • Faulty Devices: If all else fails, there may be a hardware fault. Some users have resolved persistent Error #67 issues by replacing the Cerbo GX or other components.

       

      What if it just says AC mode not available?

       

      If your Victron system displays the message "AC mode not available", it typically indicates an issue with the AC input or configuration. Here’s a step-by-step guide to troubleshoot:

      1. Verify AC Input Connection

      • Check the AC input connection to ensure that the power source (e.g., shore power or generator) is securely plugged in and delivering power.
      • Confirm that the power source is functional by testing it with another device.

      2. Check the Victron Settings

      • Input Mode Configuration:
        • Navigate to the Victron system settings using the GX device or VictronConnect app.
        • Verify the "AC Input Current Limit" is correctly set for the connected power source.
      • AC Input Selection:
        • Ensure the system is set to the correct input mode (shore power, generator, etc.).
      • Charger Settings:
        • Check if the charger is disabled in the settings. If so, enable it for AC input to work.

      3. Inspect AC Voltage Levels

      • Use the system’s monitoring interface or a multimeter to verify the AC voltage at the input terminals.
      • Victron devices require the input voltage to be within a specific range (e.g., 90-140V for 120V systems). If it’s outside this range, the system won’t accept AC input.

      4. Check for System Errors

      • Look for additional error codes or warnings in the GX device or the VictronConnect app. Common issues like frequency mismatches or unstable power sources can also cause this issue.

      5. Reset the System

      • Power cycle the entire system:
        1. Turn off the AC input and disconnect it.
        2. Turn off the inverter/charger.
        3. Reconnect the AC input and turn everything back on in sequence.

      6. Examine AC Input Hardware

      • Inspect the AC input breaker, wiring, and terminals for damage or loose connections.
      • If using an external generator, check that its output is stable and meets Victron’s input requirements.

      7. Firmware Update

      • Ensure that the firmware for all components (inverter, GX device, etc.) is up-to-date. Older firmware versions can sometimes cause communication or detection issues.

      8. Test with an Alternative AC Source

      • If possible, test the system with a different AC power source to determine if the issue lies with the current power source.