Victron LG Chem RESU Settings and Compatibility Guide

Key Takeaways

• The LG Chem RESU battery models previously compatible with Victron systems are now End-of-Life and no longer supported by LG.
• A Victron GX device (Color Control GX or VENUS GX) is essential for communication via CAN-bus.
• Proper CAN-bus cabling and termination are critical to prevent the battery from stopping charge/discharge or opening its internal circuit breaker.
• These systems were designed for on-grid, self-consumption installations and cannot be used in off-grid or parallel/three-phase configurations.

Why isn't my LG Chem RESU battery communicating with my Victron system?

The most common cause for communication issues or the battery stopping operation is an improperly connected CAN-bus cable or missing GX device keep-alive signal. Ensure the correct VE.Can to CAN-bus BMS type B cable is used and properly terminated.

Diagnosis

Follow these steps to diagnose communication and operational issues with your LG Chem RESU battery connected to a Victron system.

1. Verify GX Device Presence and Firmware: Check if a Color Control GX (CCGX) or VENUS GX is installed. A GX device is required for the keep-alive signal, communication of charge and discharge limits, error codes, and state of charge. The minimum required firmware version for the Color Control GX is v2.15. It is highly recommended to use the latest firmware version on all connected devices, including CCGX/VENUS GX, Inverter/Charger, and MPPTs. Without a GX device, the LG Resu will open its internal circuit breaker after 10 minutes.
2. Inspect CAN-bus Cable Connection: Ensure the VE.Can to CAN-bus BMS type B Cable, part number ASS030720018, is correctly connected. Plug the side labeled "Battery BMS" into the LG Chem Resu BMS. Plug the side labeled "Victron VE.Can" into the GX device. Without properly connecting this cable, the battery will stop charging/discharging after several minutes.
3. Check VE.Can Terminator: Verify that a VE.Can terminator is plugged into the other VE.Can socket on the GX device. Two VE.Can terminators are included with the package of the CCGX as an accessory, but only one is used for this setup.
4. Confirm ESS Installation: The LG Battery can only be used in a Victron ESS installation that uses the ESS Assistant. Ensure your system is configured as an ESS for on-grid, self-consumption. These batteries are not for off-grid systems and cannot be used in parallel or three-phase configurations with the MultiPlus 48/3000/35.
5. Verify MPPT Compatibility: If using MPPT Solar Chargers, ensure they have a VE.Direct port. The VE.Can MPPTs are not supported with LG Resu batteries.

Cause/fix table

Pairing and Settings

Proper configuration of your Victron system is crucial for optimal operation with LG Chem RESU batteries. Note that this compatibility document is now End-of-Life, and LG no longer supports these RESU models.

Victron MultiPlus Configuration

The approved Victron inverter/charger for these batteries was the MultiPlus 48/3000/35. This unit cannot be used in parallel or three-phase configurations with LG Chem RESU batteries.

GX Device Communication

A GX device (Color Control GX or VENUS GX) is essential. It uses the CAN-bus connection for the keep-alive signal, communication of charge and discharge limits, error codes, and state of charge. The minimum required firmware version for the Color Control GX is v2.15. It is highly recommended to use the latest firmware version on all connected devices.

VEConfigure Settings

When configuring your Victron MultiPlus using VEConfigure, ensure the following settings are applied:

LG Resu SW Select Switches

For LG Resu models 3.3, 6.5, and 10, set the following switches on the battery itself:

Communication Cable and Termination

Use the VE.Can to CAN-bus BMS type B Cable, part number ASS030720018. Plug the side labeled "Battery BMS" into the LG Chem Resu BMS. Plug the side labeled "Victron VE.Can" into the GX device. A VE.Can terminator must be plugged into the other VE.Can socket on the GX device.

Safety

Always prioritize safety when working with battery systems.

• Firmware Updates: Do not attempt firmware updates using the LG Chem battery for power until you can confirm that the battery is connected and showing on the GX device. An interrupted update can cause system instability.
• Electrical Safety: When connecting or disconnecting terminals, always kill power to all connected components (PV, battery, AC breakers) first. Use insulated tools. A spanner across a battery bank can short hundreds of amps, causing severe burns or equipment damage.

When to call a technician instead

Given that LG no longer supports the RESU models previously compatible with Victron, and the official compatibility document is End-of-Life, troubleshooting complex issues beyond basic communication checks may require specialized knowledge. If you cannot resolve communication errors after following the diagnosis steps, or if the battery exhibits unexpected behavior, contact a qualified solar technician. Attempting repairs or modifications without proper authorization may void any remaining warranties.