X1 Boost G4 DSP 23 ARM 30 - incorrect grid and energy register readings

[Wasi51]

Trying to get Home Assistant working with Solax inverter PV system
Inverter: SolaX X1 Boost G4
Firmware: DSP 23 ARM 30
Dongle: Pocket WiFi 3.0 firmware 2.1
Modbus address: 1
Connection: Modbus TCP over WiFi
What works: PV1/PV2 power, Today's Yield
What doesn't: Grid Power inverted and wrong magnitude, all kWh energy entities stuck at 0.00 except Today's Yield
App vs HA comparison: app shows 491W solar / 7.6kW grid import, HA shows 1864W solar / -1773W grid -

Any assistance with getting mapping correct appreciated - Have asked Solax for latest firmware files in case this is the/an issue

[rosenrot00]

Did you verify that the wrong readings are correct when you read them manually? Check you modbus protocol version and then based on the Solax Modbus documents read the registers using mbpoll and try to figure out if they map with HA or with the true values.

[Wasi51]

Thanks for your response - yes the readings on the app and current clamp are consistent. I have tried mapping different entities in HA to see if I could find a match - I will review the modbus documents - I thought maybe there was a simple answer in the inverter or firmware version.

[Wasi51]

After a bit of time with Modbus Poll (Solax say they have no document available for the G4) - In case this is useful for anyone -
I have found some registers that agree with Solax app:

1032 Grid import/export (W, signed) negative = import
1033 Total solar PV (W)
1040 PV1 power (W)
1041 PV2 power (W)

What I couldn't find via Modbus Poll:

Lifetime energy totals (kWh)
Today's yield (kWh)
Grid import/export totals (kWh)

My model is X1-Boost-G4 - ARM Firmware 047-000 - DSP Firmware 035 - Pocket Wifi-4G Firmware 1.005.05

[wills106]

What's the first couple of digits of your Inverter, so I can check it's being mapped in correctly.
Todays yield should be 0x437

[Wasi51]

Serial number starts XB4050K

[Wasi51]

Number at 0x437 x 100 matches day's solar yield from app