Device Seplosbmsv3 Modbus Register 4100: Name bms name battery discharged capacity

Technical Definition

The register name bms name battery discharged capacity at address 4100 is used to monitor name bms name battery discharged capacity on the Device Seplosbmsv3.

• 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 name_bms_name_battery_discharged_capacity (Address: 4100)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4100, 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: "name_bms_name_battery_discharged_capacity"
  address: 4100
  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[Device Seplosbmsv3]

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

💡 Engineer's Insight

Analysis: The total energy discharged from the battery since its first use (in Ampere-hours or Watt-hours). Tracks usage history.

Troubleshooting: Zero may mean the counter hasn't reset or there's a BMS internal error. Check BMS logs for errors or reset functionality.