I have had my PV installed since Dec 23, havent really done manual checks, but everything matched with my Octopus App and my dashboard, but from 22.5.24 the readings are all difference and do not match? any ideas what this can be? it either shows we are exporting lots more than the dashboard or the other way round?
I think there has been discussion recently where a slight variation between metered export and the figures in the Portal is expected due to the sampling rate of the GivEnergy system. If it samples once every five minutes or even every minute then it can only assume that the system continued performing at that level until the next sample time.
In reality with a combination of sunshine and clouds we can go from generating 2kW from the roof to 400W in a matter of seconds when a cloud puts the panels in shade, and of course back again.
Given how cloudy the weather has been the last few months I would imagine that is the cause.
As long as your supplier is showing the same numbers for export as your Smart Meter I don't think there is any particular reason to be alarmed and I would trust those readings - not the GivEnergy Portal - to be canonical.