I suggest a generac, (or a competitor brand) AUTOMATIC whole house generator.
this is what I have.
I installed it myself a few years ago. You can get them to run on either Natural gas or propane. It has an automatic transfer switch that switches to the generator power within 5 seconds of you losing electricity....BY ITSELF. you do nothing. When the power comes back on, it switches back. No gas to store, No cords, Nothing for you to do..
It is perminant...no one can ask to "borrow" it. It increases your home value. Piece of mind is HUGE.
Here is a picture of mine....
Excuse the hoses lying around...usually neater then that. Goinf any other way has it's problems. Gas storage, starting them, maintaining them, cords, backfeeding, etc,etc. This is the only way to go.....
Frank D.