Esp32 S3 Zero Deye8K Modbus Register 502: Active power generation of today

Technical Definition

The register active power generation of today at address 502 is used to monitor active power generation of today on the Esp32 S3 Zero Deye8K.

• Protocol: Modbus RTU
• Data Type: S WORD
• 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 active power generation of today (Address: 502)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=502, 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: "active power generation of today"
  address: 502
  value_type: S_WORD
  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: Active power generated today (kW). Reset daily at midnight.

Troubleshooting: Zero if no generation today. Check solar irradiance, panel condition, inverter operation, and shading.