Victron BYD B-Box Battery Compatibility Guide

Key Takeaways

• A Victron GX device is essential for communication between Victron equipment and BYD B-Box batteries.
• Specific firmware versions are required for both Victron GX devices and BYD B-Box batteries to ensure proper operation.
• The primary communication protocol between the BYD battery and the GX device is BMS-Can (CAN-bus) at 500 kbit/s.
• Ensure your battery bank size is appropriate for your solar array to prevent over-current alarms and ensure system stability.

Are Victron and BYD Batteries Compatible?

Yes, Victron Energy equipment is compatible with several BYD B-Box low-voltage (LV) battery series. This compatibility allows for integrated energy storage solutions in ESS, Grid Backup, and Off-Grid system configurations. Proper setup requires specific firmware versions and correct communication wiring via a Victron GX device.

Compatible BYD B-Box Battery Models

Victron Energy supports various BYD B-Box low-voltage battery series. The maximum capacity for each series depends on the number of modules used.

Required Victron Firmware and Communication Settings

Successful integration of Victron and BYD B-Box batteries relies on specific firmware versions and correct communication protocols. A Victron GX device is central to this communication.

Firmware Requirements

Ensure all components meet the minimum firmware versions for stable operation.

If your BYD B-Box Premium batteries require a firmware update, this can be done automatically via the ethernet port on the BMU when connected to the internet.

Communication Protocols

The communication between Victron and BYD batteries is managed through a GX device.

It is essential to use the BMS-Can connection of a GX device with the BYD batteries. This connection provides the keep-alive signal, communicates charge and discharge limits, transmits error codes, and reports the state of charge.

Essential Setup Steps for Victron-BYD Systems

Follow these steps to ensure proper communication and operation between your Victron equipment and BYD B-Box batteries.

1. Verify Firmware Versions: Before connecting, check that your Victron GX device, inverter/charger, and BYD battery modules meet the minimum firmware requirements. Update any components that are running older versions.
2. Connect BYD BMS to GX Device: Use a CAN-bus cable to connect the BYD battery's BMS to the BMS-Can port on your Victron GX device. Ensure the connection is secure. The GX device's CAN-bus speed is set to 500 kbit/s.
3. Connect Victron Inverters/Chargers: Connect your 48V Victron Multi, MultiPlus, MultiGrid, Quattro, or RS models to the GX device via VE.Bus.
4. Connect Victron MPPT Chargers: Connect your 48V BlueSolar or SmartSolar VE.Direct MPPT Chargers (excluding 150/70 CAN-bus and 150/85 CAN-bus models) to the GX device using VE.Direct or VE.Can.
5. Power On and Verify Communication: Power on the system. On the GX device's display or via the Remote Console, confirm that the BYD battery is detected and reporting its status, including state of charge and any operational limits.
6. Monitor for Alarms: Observe the system for any error codes or alarms, particularly during initial charging and discharging cycles. Address any communication errors or warnings promptly.

Safety Considerations for Victron-BYD Installations

Proper system design and sizing are critical for safe and reliable operation.

• Off-Grid Systems: For off-grid systems, it is strongly recommended to include a minimum of DC-Coupled PV (MPPT Solar Charger) in the system. Relying solely on AC-Coupled PV is not advised.
• Minimum Battery Configuration: Both BYD and Victron may not provide support for systems that are not sized according to their minimum battery configuration tables. Consult the latest BYD manuals for specific sizing requirements.
• Over-Current Protection: Using very large solar arrays with battery banks that are too small can exceed the battery's charging limits. This can lead to the BYD Battery Management Unit (BMU) triggering over-current alarms, which may disrupt system operation. Ensure your battery bank capacity is appropriately matched to your solar array's output.

When to Call a Technician Instead

While basic setup can be performed by experienced users, certain situations warrant professional assistance:

• Persistent Communication Errors: If the GX device fails to detect the BYD battery or communication errors persist despite verifying all connections and firmware.
• Unresolved Firmware Update Issues: If you encounter problems updating the firmware on either the Victron or BYD components.
• System Sizing Concerns: If you are unsure about the appropriate sizing of your battery bank relative to your solar array or inverter capacity.
• Unusual Battery Behavior: Any unexpected battery behavior, such as rapid discharge, unusual charging patterns, or repeated alarms that cannot be resolved through basic troubleshooting.
• Warranty Concerns: To avoid voiding warranties, ensure all installations comply with manufacturer guidelines. If you are uncertain about any step, consult a certified Victron or BYD installer.