Friend has a new system ( Quattro 469, GX v2.42,MPPT v1.46, Battery Monition V6.8 , Lithiumwon on canbus ) installed by a professional installer . I have been given monitoring rights and I see at times that as much as 200W is fed to grid when grid feed has been set to zero . This occurs in short bursts ( I guess less than 1 minute which is the sampling times of the portal ) . The installer blames the firmware on the battery which I find weird!. I have notice than there is no external current probe or energy meter meter on the system . Could this be the issue? Can you fit an external probe to a quattro?