[SUPPORT] Inability of Home to display a sensor value, but the sensor can be displayed as secondary value

[EPeterE]

Hi
I am not sure what I am doing wrong. I have created a sensor value "Home consumption" which is the power generated by the PV system subtracting the power from the battery. I require this since my invertor and controller uses power which is not recorded. So I would like the primary "Home" value to reflect the value of this sensor. However, the flow card doesn't display the value. The sensor can be displayed as a secondary value, but then the flow chart is incorrect since I assume it is based on the primary value. Is there anyway to correct this?
Just for clarity, the system is offgrid, so there should be no line from the BATTERY to the GRID either.

So in the evening, the PV generated is zero and the battery is discharging so the value for the Home Consumption sensor is 0--466W=466W and not the displayed value of 0. Due to the display showing 0, the flow card flow lines are wrong too.

The secondary value is showing the sensor value correctly.

And the sensor is created as a helper

Thanks