Fronius Daily Energy Calculation - what's everyone using?

[travellingkiwi]

I have a Fronius 6kW inverter, with battery, and fronius smart meter.

Despite the docs saying there's a total energy usage sensor in there somewhere. I don't see one. There's a total energy for import, and a total energy for export (At the meter), and a total energy supplied at the inverter (From PV and Battery). But there's no ready configured sensor

There's also a hallucination(?) in google AI that thinks PredBat will calculate the sensor itself (I don't see any docs that say this, so I'm treating it as a hallucination for the moment). Does fronius_automatic: actually exist?

So what are others with Fronius using? And which method has been the most accurate?

I've had a look at a helper. And it's easy enough o create one. but it's a helper, relying on other helpers. And they were likely created at different times. So the numbers don't add up.
Or I could create a helper for power...

(PV_Power+Grid_Import+Battery_Discharge)-(Grid_Export+Battery_Charge)

And integrate that... Or...

(PV_Power-Nett_Battery-Nett_Grid)

And integrate that...