Solis Modbus Esinv Modbus Register 33140: Battery state of health (SoH)

Technical Definition

The register Battery state of health (SoH) at address 33140 is used to monitor battery state of health (soh) on the Solis Modbus Esinv.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: %
• 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 Battery state of health (SoH) (Address: 33140)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=33140, 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: "Battery state of health (SoH)"
  address: 33140
  value_type: U_WORD
  unit_of_measurement: "%"

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: Battery State of Health (SoH). Represents the battery's current condition relative to its original capacity, expressed as a percentage (0-100%).

Troubleshooting: Zero value could signal severe degradation, internal damage, or a critical failure requiring battery replacement.