Esp32 Main Meter Modbus Register 102: Sdm630 maximum total system va demand

Technical Definition

The register sdm630 maximum total system va demand at address 102 is used to monitor sdm630 maximum total system va demand on the Esp32 Main Meter.

• Protocol: Modbus RTU
• Data Type: FP32
• Unit: VA
• 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_va_demand (Address: 102)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=102, 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_va_demand"
  address: 102
  value_type: FP32
  unit_of_measurement: "VA"

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 apparent power demand (VA). Peak apparent power usage.

Troubleshooting: Zero if no load or meter fault. Indicates historical peak demand.