I know this is overkill for your application, but we build/sell an essentials circuit version of our Mi-Grid system.
You install a sub-panel in the house and it is connected to the inverter output of our smallest system. On the smallest system, you cover all 110VAC circuits: Outlets, Lights, Fans. This is also connected to about 5kW of Solar and a battery bank. A generator is also connected, to cover solar contingencies.
The 20kW Natural Gas/Propane Generator and ATS also covers "everything else". The beauty is, the 20kW generator only needs to run when you want to run 240VAC devices. It will auto start if the batteries get low in power, and recharge them.
A larger Mi-Grid system allows more (and 240VAC) devices to be on the inverter.
http://www.tetrawest.com/images/Mi-Grid_essentials.pdf
