Power consumption and Home Assistant

I have got my essential circuits in the house on permanent EPS (fridge, freezer, boiler, alarm, router, sky box etc) and the rest of the house on non essential - the normal input/output connection to the inverter.

When looking at the GivEnergy Power Graph, I can see Load Power and EPS output power as separate lines.
In home Assistant I can set up GivLocal Consumption Power, Inverter EPS Backup Power and with MQTT GivTCP Load Power.

GivLocal Consumption Power and TCP Load Power are within a few Watts of each other so that may be a slight timing issue.

What I am trying to establish is whether the power being used by the house is the SUM of either GivLocal Consumption Power or TCP Load Power OR the TCP is already included in those numbers.

I guess I am going to have to take some night readings with not much going on, switch the EPS circuits back to the normal input/output side of the inverter and take some more readings and compare!

Just turn on one device with a known consumption on the EPS circuit and and monitor the two values. If you use something like an old fashioned 60w lightbulb it will be constant and should be simple enough to test.