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BATTERY_COM Fail: Battery communication failure

The inverter is displaying a "CAN_COMM_Fail" or "Battery_COM_Fail" error, meaning it's not detecting communication between the battery and itself. Since this communication is essential for batteries to work, the system will stop functioning until the issue is resolved.

Possible reasons

  • A problem with the inverter's port.
  • A problem with the CAN cable connecting the battery and inverter.
  • An issue on the battery side, such as it being turned off.

Before You Begin

Safety First: Working with electrical equipment always involves risks. Ensure you are qualified and follow appropriate safety precautions. Disconnect the inverter from both AC and DC sources before performing any physical inspection or adjustments.

Gather Information: Before starting troubleshooting, have the inverter manual on hand. You should also gather information about the inverter model and serial number, the installation date, and the PV array configuration (number of panels, capacity, and number of strings).

Troubleshooting Steps

  1. Ensure the inverter is powered up: The inverter needs to be receiving power from either PV-modules, the batteries or the grid for the test to work.

  2. Check for CAN communication: There are two methods to check if the inverter is sending out CAN communication:

    • Method 1: Using a Test Cable
      1. Create a test cable: Make a cable with an RJ45 connector on one end that fits into the inverter's communication port. On the other end, strip the wires back, exposing pins 2, 4, and 5. The wire colors for these pins may vary depending on your RJ45 connector, so be sure to check the pinout.
      2. Connect the cable: Plug the RJ45 end of the test cable into the inverter's communication port.
      3. Set up your multimeter: Set your multimeter to measure DC voltage in the Volt range.
      4. Measure the voltage: Connect one probe of the multimeter to the ground wire (pin 2 on the RJ45) and the other probe to either pin 4 or 5. The voltage reading should be around 2.5V. Repeat this measurement for the other pin (4 or 5).
    • Method 2: Direct Measurement (If Qualified)
      1. Use multimeter probes with small tips: This method requires multimeter probes with small tips that can directly contact the pins inside the inverter's communication port.
      2. Measure the voltage: With the inverter powered up, carefully connect one probe to pin 2 (on the right-hand side of the port) and the other probe to either pin 4 or 5 (moving numerically left). You should measure around 2.5V. Repeat this for the remaining pin.

Validating the solution

If both pins 4 and 5 show a voltage of around 2.5V relative to pin 2 when using either of the testing methods, the inverter's communication port is functioning correctly and sending CAN communication. You should then investigate potential issues with the CAN cable or the battery system.

If the problem is not resolved

If the error persists after completing these steps, there might be an internal fault within the inverter.

  • As a system owner: In this case, contact the inverter installer or distributor for further assistance. You can find the details of your installer in the MyAutarco app.
  • As a certified installer: Contact Autarco Support, you can submit a support case via Helios.