[Buddahaid]

I have no idea about power where you live but connecting alternate power sources to your house requires some sort of switching for safety. If you have a gas generator large enough to power the house you would need to disconnect from the power grid before tying in the generator, or have an expensive transfer switch arrangement that handles that automatically. It's needed to handle phase problems etc.

I simply unplug my fridge from the wall and into an extension cord from the little generator running outside when needed.

Solar panel systems also use some type of transfer switching arrangement but I don't know how those work.