Sundye 3P 1 Atom Modbus Register 592: The corrected capacity of the battery

Technical Definition

The register The corrected capacity of the battery at address 592 is used to monitor the corrected capacity of the battery on the Sundye 3P 1 Atom.

• 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 The corrected capacity of the battery (Address: 592)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=592, 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: "The corrected capacity of the battery"
  address: 592
  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[Sundye 3P 1 Atom]

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

💡 Engineer's Insight

Analysis: Shows the battery's capacity adjusted for factors like Temperature or age, in Ah or kWh.

Troubleshooting: If significantly lower than 'battery capacity', it suggests aging or environmental impact. Monitor for rapid degradation.