Pylontech US2000, US3000C, US5000 DIP Switch Setup for Victron Systems

Pylontech low-voltage rack batteries, including the US2000, US3000C, and US5000 series, are popular choices for Victron Energy systems. Correctly configuring their DIP switches and communication settings is crucial for stable operation and proper battery management. This guide details the step-by-step process for setting up these Pylontech batteries with Victron GX devices.

Understanding Pylontech Models and Communication

Pylontech batteries integrate with Victron systems via CAN-bus communication, allowing the battery's internal Battery Management System (BMS) to share critical data and control charging/discharging limits. The models covered in this guide are:

• Pylontech US2000 (Plus/C/D): 48V nominal, 2.4 kWh module capacity.
• Pylontech US3000(C): 48V nominal, 3.5 kWh module capacity.
• Pylontech UP5000 & US5000(B): 48V nominal, 4.8 kWh module capacity.

For a Victron GX device to detect and manage these batteries, specific firmware versions, cabling, and DIP switch settings are required.

Safety First: Working with Battery Systems

Working with battery systems involves significant electrical hazards. Always prioritize safety by following these guidelines:

• Qualified Personnel Only: Configuration, installation, service, and operating tasks should only be performed by qualified personnel.
• Isolate Power: Before making any connections or adjustments, ensure all power sources (PV, AC, and battery) are disconnected and isolated.
• Pre-charge DC Bus: It is essential to pre-charge the DC bus before switching on the battery breaker to prevent huge inrush current and potential damage. This can be achieved by switching on the AC input to inverters or solar panels to MPPTs.
• Firmware Updates: Do not attempt firmware updates using the battery for power until communication is confirmed. If the battery turns off midway through a firmware update, the consequences could be serious.

Step-by-Step Pylontech DIP Switch and Communication Setup

Follow these steps to ensure your Pylontech batteries are correctly configured for your Victron Energy system.

Step 1: Verify Firmware Requirements

Ensure your Victron GX device and VE.Bus products meet the minimum firmware versions for Pylontech compatibility.

• GX Device Firmware: For new systems, the minimum required firmware version for the GX Device (e.g., Cerbo GX) is v2.42. It is highly recommended to use the latest available firmware.
• VE.Bus Firmware: The minimum firmware version for new installations of VE.Bus products (MultiPlus, Quattro) is 469. It is highly recommended to use the latest available firmware.

Step 2: Connect CAN-bus Communication Cable

The correct Victron VE.Can to CAN-bus BMS cable is essential for communication between your Pylontech battery bank and the GX device.

• For US2000C/D, US3000C, UP5000, US5000, US5000B, Force-L: Use the Victron **VE.Can to CAN-bus BMS type A Cable**, part number ASS030710018.
• For US2000, US3000, UP2500: Use the Victron VE.Can to CAN-bus BMS type B Cable, part number ASS030720018.

Connect one end of the cable to the Pylontech battery's CAN port and the other end to the VE.Can port on your GX device.

Step 3: Configure Pylontech DIP Switches

For most Pylontech installations with Victron GX devices, the DIP switches on the master battery unit must be set to a specific configuration.

• DIP Switch Setting: The address DIP-switches must be set to 000 for correct operation. If any other setting is used, the GX device will not detect the battery.

Step 4: Identify the Master Battery Unit

When connecting multiple Pylontech battery modules in parallel, one battery must be designated as the master.

• Master Battery Identification: The battery with the empty link port 0 is the master battery. Multiple battery modules connect via RJ-45 cable using link ports to form a single large battery.

Step 5: Configure GX Device CAN-bus Profile

After physically connecting the battery and setting the DIP switches, configure the GX device to recognize the Pylontech BMS.

1. Navigate to the GX device menu: Settings -> Services -> VE.CAN port.
2. Select the CAN-bus BMS (500 kbit/s) CAN-profile. The CAN-bus baud rate for BMS-Can communication is 500 kbit/s.

Step 6: Verify DVCC and Shared Sense Settings

Dynamic Voltage and Current Control (DVCC) is crucial for proper battery management in Victron systems with managed batteries.

• DVCC: DVCC will be forced ON if the GX device runs v2.80+ and the Pylontech battery is correctly detected.
• Shared Voltage Sense (SVS): This setting will be forced OFF if the GX device runs v2.80+.
• Shared Temperature Sense (STS): This setting will also be forced OFF if the GX device runs v2.80+.

Step 7: Consider LV-Hub for Large Systems

For larger Pylontech battery banks, additional equipment may be necessary.

• LV-Hub: When using more than 8 parallel units, some limitations, additional configuration or equipment (e.g., Pylontech LV-Hub) may apply. Consult Pylontech documentation for specific models and scaling requirements.

Step 8: Minimum Battery Sizing for Inverters

Ensure your Pylontech battery bank is adequately sized for your Victron inverter/charger to prevent issues like unexpected shutdowns due to inrush current or overload. Below are examples for US2000 modules:

These minimums are necessary to supply startup inrush surge currents. In off-grid systems, the inverter will prioritize running the load, and potentially exceed the battery's Discharge Current Limit. This could lead to the battery shutting down, highlighting the importance of following minimum battery sizing guidelines.

Troubleshooting Common Pylontech Issues

If you encounter problems after setup, consider these common issues:

• Battery Turns Off Unexpectedly: This can occur if the communication cable is not properly connected or the battery is not showing on the GX device display. Without properly connecting this cable, the battery will not show up on the display of the GX device. The battery will also turn itself off.
• MPPT Error #67: If an MPPT charge controller stops charging and flashes an error code on its LEDs, and the error code is error #67, it indicates "no BMS" communication. Recheck your CAN-bus cabling and GX device settings.
• BMS Triggers Over-Current Alarms: Using very large solar arrays with battery banks that are too small can exceed the limits of the batteries' ability to charge and possibly lead to the BMS triggering over-current alarms.
• High Voltage / Internal Error Alarms: If you experience "High Voltage" or "Internal Error" alarms, you may need to enable "Limit managed battery charge voltage" and adjust the voltage limit down for balancing. Otherwise, this feature should be left OFF.

By following these detailed steps, you can ensure a reliable and efficient integration of your Pylontech US2000, US3000C, or US5000 batteries with your Victron Energy system.