Bms Combine Modbus Client Modbus Register 13: Battery Capacity Remaining

Technical Definition

The register Battery Capacity Remaining at address 13 is used to monitor battery capacity remaining on the Bms Combine Modbus Client.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Ah
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read Battery Capacity Remaining (Address: 13)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=13, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "Battery Capacity Remaining"
  address: 13
  value_type: U_WORD
  unit_of_measurement: "Ah"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Bms Combine Modbus Client]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Indicates the current available charge in the battery, typically expressed as a percentage (%) or in Ampere-hours (Ah).

Troubleshooting: Zero could mean battery is fully discharged, a BMS fault, or sensor malfunction.