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EG4 Battery: Configuring DIP Switches for Victron GX Communication

EG4 batteries communicating with Victron GX device configuration: Learn the correct DIP switch settings for seamless off-grid energy management.

Frequently Asked Questions

•What are the correct DIP switch settings for an EG4 LL V2 battery to communicate with a Victron GX device?

Refer to the EG4 LL V2 battery manual, but typically DIP switches 1 and 2 should be set to 'ON' while all other switches are 'OFF' for Victron GX communication. Always confirm with the official documentation.

•How do I test the CAN bus communication between the EG4 battery and the Victron GX?

Use VictronConnect software to monitor CAN bus traffic and identify any communication errors. A CAN bus analyzer can also be used to verify the signal integrity of the CAN bus communication.

•What voltage should I expect to see on the CAN bus wires?

The CAN bus wires should have a differential voltage of around 2.5V. Use a multimeter to measure the voltage between the CAN_H and CAN_L wires. The common mode voltage should be approximately 2.5V.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Expert Tip:

A common mistake is incorrect DIP switch order. Double-check the EG4 manual diagram, often a zoomed-in photo of the DIP switch itself reveals the correct on/off sequence. Use a magnifying glass for close visual inspection.

Important Warnings:

High DC voltage is present in battery storage systems. Always disconnect the battery bank from the system before working on any electrical connections. Wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves. Follow all applicable NEC codes and local regulations for battery storage system system and maintenance. A qualified electrician is required for all electrical work.

Step-by-Step Fix:

1

Consult the EG4 battery manual for the correct DIP switch settings required for Victron GX communication. Ensure all batteries in the system have identical DIP switch settings. Use a small flathead screwdriver to adjust DIP switches.
2

Verify the CAN bus termination resistor is correctly installed and has the proper value (typically 120 ohms). Use a multimeter to measure resistance across the CAN bus wires at the Victron GX side. The measured resistance should be approximately 60 ohms when the termination resistor is correctly installed at both ends of the CAN bus.
3

Inspect the CAN bus cable for damage and ensure all connections are secure. Use a CAN bus analyzer to verify the signal integrity of the CAN bus communication.
4

Check the firmware versions on both the EG4 battery BMS and the Victron GX device. Update to the latest compatible versions if necessary, following manufacturer's instructions.
5

Inspect the CAN bus communication ports on both the EG4 battery and the Victron GX for any physical damage. Replace damaged components as necessary.
6

In the Victron GX device settings, verify that the correct battery profile for EG4 batteries is selected. Consult the EG4 battery manual for the recommended battery profile settings.
7

Use VictronConnect software to monitor CAN bus traffic and identify any communication errors. Refer to Victron's troubleshooting documentation for specific error codes.

Symptoms:

EG4 batteries not communicating with Victron GX device. Data such as battery voltage, current, SOC, and SOH are not displayed on the Victron GX. Error messages related to missing battery data may appear on the GX device.

How It Works:

The Victron GX device relies on CAN bus communication to receive battery data from the EG4 battery BMS. The EG4 battery BMS communicates essential parameters like voltage, current, SOC, SOH, and temperature. Proper DIP switch configuration on the EG4 battery is crucial for establishing the correct CAN bus address and protocol for communication with the Victron GX. Without correct communication, the Victron GX cannot manage the charging and discharging of the EG4 batteries effectively, leading to potential system instability or damage.

Possible Causes:

Incorrect DIP switch settings on the EG4 battery, leading to CAN bus communication failure.
CAN bus termination resistor issue (incorrect value or missing termination).
Faulty CAN bus cable or connections between the EG4 battery and the Victron GX.
Incompatible firmware version on either the EG4 battery BMS or the Victron GX device.
Physical damage to the CAN bus communication port on either the EG4 battery or the Victron GX.
Incorrect battery profile selected in the Victron GX device settings.

Prevention:

Regularly inspect CAN bus cable connections and ensure they are secure
Periodically check the DIP switch settings on the EG4 batteries to ensure they have not been accidentally changed
Monitor the Victron GX device for any communication errors and address them promptly
Update the firmware on both the EG4 battery BMS and the Victron GX device as new versions become available
Perform annual capacity testing of the battery bank to monitor SOH and identify any potential issues early