Esp32 Main Meter Modbus Register 86: Sdm630 maximum total system power

Technical Definition

The register sdm630 maximum total system power at address 86 is used to monitor sdm630 maximum total system power on the Esp32 Main Meter.

• Protocol: Modbus RTU
• Data Type: FP32
• Unit: kW
• 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 sdm630_maximum_total_system_power (Address: 86)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=86, 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: "sdm630_maximum_total_system_power"
  address: 86
  value_type: FP32
  unit_of_measurement: "kW"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 Main Meter]

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

💡 Engineer's Insight

Analysis: Maximum total system power recorded (W). Indicates peak demand.

Troubleshooting: Zero if no load or meter fault. May be low if system is idle.