Victron WeCo Battery Compatibility Guide: Connecting and Configuring Lithium Batteries

Key Takeaways

• WeCo lithium batteries require a Victron GX device for proper communication and system integration.
• BMS-Can, operating at 500 kbit/s, is the mandatory communication protocol between WeCo batteries and the GX device.
• Specific minimum firmware versions are essential for Victron inverters, chargers, and the GX device to ensure compatibility.
• Incorrect communication setup or outdated firmware can prevent the system from operating correctly or safely.

How do I connect and configure WeCo lithium batteries with Victron Energy systems?

WeCo lithium batteries are compatible with Victron Energy systems, but they require specific communication and firmware settings to function correctly. The primary requirement is a Victron GX device, which facilitates communication via BMS-Can. This guide outlines the necessary steps and settings for a successful integration.

Compatibility and Configuration Checklist

To ensure your Victron system properly integrates with WeCo lithium batteries, verify the following:

1. Victron Device Compatibility

Ensure your Victron inverter/charger and solar chargers are compatible. All 48V Victron Multi, MultiPlus, Quattro, and RS models are compatible. All 48V Victron BlueSolar and SmartSolar MPPT Chargers are also compatible.

2. Firmware Requirements

Outdated firmware can prevent proper communication and control.

• VE.Bus models (Multi, MultiPlus, Quattro): The minimum supported firmware is 469.
• RS models: The minimum supported firmware is 1.16.
• Victron GX device: The minimum supported firmware version is v3.31.

3. GX Device and Communication

A Victron GX device is essential for WeCo battery communication.

• GX device connection: WeCo batteries require a Victron GX device for communication via BMS-Can, operating at 500 kbit/s. This connection is used to transmit charge and discharge limits, error codes, and the battery's state of charge.
• Inverter/charger connection: These units must be connected to the GX device via the VE.Bus connection port.
• Solar charger connection: Both VE.Direct or VE.Can communication ports can be used to connect the solar charger to the GX device. This connection is mandatory for regulating charge currents and voltages.

4. GX Device Settings

When a WeCo battery is connected to the GX device, certain settings are automatically managed by the system.

• DVCC (Distributed Voltage and Current Control): Forced enabled.
• SVS (Shared Voltage Sense): Forced enabled.
• STS (Shared Temperature Sense): Disabled.

Configuration Requirements Table

This table summarizes the key components and settings needed for Victron and WeCo battery integration.

Safety: Lithium Battery and Electrical System Considerations

While the provided documentation does not detail specific safety facts for WeCo batteries, general safety practices for lithium battery systems and electrical installations must be followed.

• Lithium Battery Handling: Never attempt to open, repair, or modify a lithium battery pack. Lithium batteries contain complex Battery Management Systems (BMS) and can pose fire or explosion hazards if mishandled.
• Electrical Safety: Always disconnect all power sources (PV, battery, AC grid) before working on any electrical connections. Use insulated tools to prevent accidental short circuits, which can cause severe burns or damage to equipment. A short circuit across a battery bank can release hundreds of amps instantly.
• Ventilation: Ensure your battery installation area has adequate ventilation, even for sealed lithium batteries, to dissipate any potential heat buildup.
• Professional Installation: If you are unsure about any aspect of wiring, configuration, or safety, consult a qualified solar technician.

When to call a technician instead

It is advisable to contact a qualified solar technician if you encounter any of the following:

• You are unable to establish communication between the WeCo battery and the Victron GX device after following all connection and firmware guidelines.
• Firmware updates fail or result in unexpected system behavior.
• The system displays persistent error codes that are not resolved by checking connections and settings.
• You are uncomfortable performing any of the wiring or configuration steps yourself.
• The system is not performing as expected (e.g., incorrect charging, unexpected shutdowns) after initial setup.
• You need assistance with advanced system configurations, such as ESS settings for grid-connected systems, which are configurable on the GX device.

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