We have just had new digital meters installed. One is an MK7A. The other is an MK10D. They are connected to our thre-phase power system. They are net meters, arranging the utilization of our solar-panel-generated electricity by the householdfirst and exporting the unused electricity to the grid. Why do I have two meters and how do I see how much electricity is being used by our household from the solar panels and how much is going to the grid?