Wherever you decide to build, be sure to check with the electric company, whether they'll even allow you to use grid-tied inverters. Also, if they do, check on their policies. Some will pay back excess you generate (bi-direction meter), other companies may only apply a partial credit towards your bill (dual meters), and still others will not pay you anything. (non-reversible meters) Prepare to jump through some hoops to get it approved. They're worried about their lineman getting electrocuted if they are working on a down grid, and your inverter is throwing a charge into it.

I never looked into dual battery/grid-tie inverters. I had no idea what they cost. OUCH!