Net Meter Circuit Design and Testing for Rooftop Solar Grid Integration Guidance

Hello, I am to work on the design and testing of a net meter for a resident roof top solar generation. The device (net meter) is to give the net consumption power of a  certain household. It indicates the difference between the excess generation from the solar system transferred to a grid(a local or micro grid) and the electricity usage from the grid when generation is lower than load consumption. Can anyone kindly help with guide lines and circuit diagrams on how i can go about it?

There are a number of steps to follow before planning to power your home with solar energy. 
*Investigate your home's energy efficiency
*Assess your solar potential and any limitations
*Assess your options for going solar
*Estimate your solar electricity needs
*Obtain bids and site assessments from contractors
*Understand available financing and incentives
*Work with your installer and utility to install the system and set up agreements.

Now is a good time to be asking this question.  With so many electric utility companies changing over to smart metering, there are a number of companies offering chips and reference designs that do what you want. Start by picking a chip that meets your requirements, and then look for a reference design for that chip. 
Analog Devices is one of the leaders in this area.  Look Here   
Also, check Texas Instruments and Maxim.-Rick

I'd point out that for a net meter, it is not actually necessary to measure the Solar panel generation power (though that is a nice thing to know).If you are importing power from the grid your voltage and current will be in phase (apart from any phase differences due to inductive or capacitive load).  If you are exporting power to the network the current will be out of phase with the voltage.  Just sum the readings over a time period and you get your net value.The other interesting thing is that the old disk meters are automatically net meters (they run backwards when exporting power).  You have to use an awful lot of electronics to do the same thing...

I have been legally diverting my excess solar generation to heat my hot water tank when I have excess power going into the grid supply. 
I use a current shunt on the service side of the tails to the import and export meter and then just make sure that I keep the algorithm on the microprocessor so that I just keep export to the grid at the bare minimum to stop importing power.You can do it all with op_amps but if you want a display then micro has to be added.I now use a commercial unit called an "I-boost" as it takes up less space than my home built model did.