Looking for solutions for the inaccurate (calculated) load value on the inverter

[abandyb]

Before my solar installation (a solis 6kw inverter + panels + battery) I had a Glow IHD which provided accurate readings of my daily load and with some basic automation helpers I could consume this data into Home Assistant via mqtt.

Then with my solar setup, I switched to the Octopus Flux tariff and with the great solis_sensor add-in I was able to see at a glance all the main indicators of my setup. However, one thing that is really poor regarding the Solis Cloud data is the provision of an accurate reading of my daily consumption - not including the power that the inverter and battery consume - and I have been without this information ever since.

From my observations it seems that the load value stated in the Solis App is actually the following calculation (using sensor names):

solis_daily_grid_energy_purchased + solis_energy_today + solis_daily_energy_discharged - solis_daily_energy_chargd - solis_daily_on_grid_energy

i.e. imported + solar_gen + battery_used - battery_charged - exported

This calculated value is way off what I expected it to be for the following reasons:

• as a flux tariff customer, my battery charges up on cheap-rate power between 2am and 5am, and this takes (by my estimates) 1.3 times as much kWh as the battery needs - I do not know the technical term for this so if anyone knows it I would be grateful - but annoyingly the imported kWh is what the inverter records rather than the battery increase kWh
• the energy flow diagram Solis uses has the inverter in the middle of the diagram and the house off on one corner, yet the load figure for the house seems to include the power that is consumed by the inverter itself - and by my estimates it uses over 120W (even when I am using very little power in my home) which I can't help but think is quite excessive

I would very much like to get an accurate reading, preferably in Home Assistant, of my home power consumption which excludes the inverter and battery. I have asked my installer's electrician but frustratingly I don't think he quite understands. I have been considering looking for mqtt devices which could clamp to my consumer unit if necessary

It seems from my observations that sensor.solis_plant_total_consumption_power represents the total power consumed including batter and inverter, and sensor.solis_total_consumption_power represents the net value I would like, but unfortunately it is not an accumating sensor

Has anyone here wanted to tackle this (and succeeded)? ... and is there - anywhere in the solis data - a sensor which shows a running total of the sensor.solis_total_consumption_power ?

Or has anyone here added a component which captures this daily consumption similar to a smart meter with mqtt?