Grid Parallel Inverter

Power from the PV array would be used to charge the batteries (if low) and to supply power to the “backed up” loads. (Loads that have been transferred to a new distribution panel off of the inverter) If your power usage on those circuits is low during peak sun hours, you will end up with very little power production from your PV.

I would suggest you rethink your position and type of inverter. Buying a fully integrated grid tie inverter with battery backup, so that you do NOT sell power to a “Reliable grid”, doesn’t make much sense to me.

You can build a solar system and transfer certain loads to it. Operate it as a stand alone system with grid backup.  That would allow you to use all of the solar that you generate.

At the other end of the spectrum, is a grid inter tie without backup. If you do not buy a large battery bank, you could invest that money into more PV.  With a larger array, you could sell more power and possibly justify the additional meter and the monthly fee.  As long as you are generating the solar and making income from it, does it really matter to you, who is consuming it ?

I looked at 
http://www.solarpowerrocks.com/mississippi/
They indicate that you may have a five cent spread between your purchase price and the solar selling price.

I do not make "early" recommendations of equipment. My experience is that people who start with or concentrate on inverters and associated equipment, end up spending way too much money on bells and whistles. They then end up skimping on batteries and PV panels. 

If you want to build a good reliable system that really does the job, start with a load inventory. It will drive your design. It will show you where you can conserve energy. Conservation is always cheaper than generation.  It will also help identify which loads must be put on the system for the few outages that you have.  It will help make the decisions about which loads can be easily transferred to the system, and how much re-wiring will be required.

The loads (device and monthly/weekly/daily draw) that you decide to put on the system, plus the reserve factor (e.g. you want 4 days) will drive the sizing of your battery bank and PV array.

Often, this is the point where the budget realities start kicking in. You may re-evaluate how many loads you are going to put on it. So it may take a couple of iterations to arrive at a good sizing.

Once you have a good sizing on the battery bank and PV array, you start looking more closely at the equipment. This is what you need to do the job for this size system. Finally, you consider future expansion and make reasonable allowances for it.

Ken