Solis Modbus Esinv Modbus Register 33036: Energy last day

Technical Definition

The register Energy last day at address 33036 is used to monitor energy last day on the Solis Modbus Esinv.

• Protocol: Modbus RTU
• Data Type: U 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 Energy last day (Address: 33036)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=33036, 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: "Energy last day"
  address: 33036
  value_type: U_WORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Solis Modbus Esinv]

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

💡 Engineer's Insight

Analysis: Energy generated yesterday in kWh. Historical daily production.

Troubleshooting: Zero: No generation yesterday, or data corruption. Low: Significantly less generation than expected for the season.