Sorry I should have said the graph page, the statistic values shown there are cumulative but the graph is power over time (i.e. your daily usage)
There is definitely something wrong with the placement of the CT clamp if the load is reading as negative, something is generating power that is making the load calculation incorrect. I can't see the time scale so not sure what time of day that is occurring, but do you have another solar system or a generator installed ?.
The app calculates load by measuring the current flow through the CT clamp, when the CT clamp current is zero the inverter knows that the amount of power being generated is the same as the load being used, likewise if it is exporting 4kW and the CT clamp is measuring 3kW it knows that the house load is 1kW.
But this can never go negative unless there is something generating power that it doesn't know about - if that is the case you fit a second CT clamp (meter2/CT2) to the generator so that it can correctly calculate load and use any exported power effectively.
The calculation is -
House Load = Grid Consumption + Inverter Output Power ('R Power') - Feedin Power + Meter2 Power
The V2 app used to let you export the raw data but this was changed to produce 'reports' which provide the summary but not the data, it's not clear if the original data export will be re-introduced.
Instead try using the new 'beta' version of their website which does allow reports and exports - you can find that here
https://www.foxesscloud.com/v2/plants/plant use the same credentials to log in.
