Esp32 S3 Zero Deye8K Modbus Register 518: Total Discharge of the Battery

Technical Definition

The register Total Discharge of the Battery at address 518 is used to monitor total discharge of the battery on the Esp32 S3 Zero Deye8K.

• Protocol: Modbus RTU
• Data Type: U DWORD R
• Unit: kWh
• 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 Total Discharge of the Battery (Address: 518)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=518, 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: "Total Discharge of the Battery"
  address: 518
  value_type: U_DWORD_R
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 S3 Zero  Deye8K]

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

💡 Engineer's Insight

Analysis: Total energy discharged from the battery pack. Units: Wh (Watt-hours) or kWh.

Troubleshooting: Could be 0 if the battery hasn't been discharged or if there's a sensor malfunction.