The microinverters talk across the neutral wire. The inspector will want the wires in the same gauge in conduit (as stated above)
Check out these two projects.
My utility company requires a disconnect switch right by the meter so check with yours and see if they require that. if so adjust your wiring plan.
Designing and Installing a Grid-Tie PV System Designing and Installing a Grid-Tie PV System
http://www.builditsolar.com/Projects...asePV/Main.htm
Doug's New 4.6 KW micro inverter DIY Grid Tied PV Array
http://www.builditsolar.com/Projects...ougEnphase.htm
Here is my 12.5 kw self-install.
http://ecorenovator.org/forum/solar-...lar-array.html