It's helpful to put bounds on the constraints that domininate
backup power preparations. As a start, three or four matter most:

1. Budget, how much to spend
2. Labor, how hard to work on maintenance, setup and shutdown
3. Goals, what the user wants to run and how long
4. Neighbors, dominated by noise and fuel storage limits

The first three are personal choices, subject to change. The last
is generally immutable: Fuel storage is regulated by law, noise 
limits are regulated by courtesy first and law last. 

One has to make guesses initially, work through the design, check 
the constraints for compatibility, adjust constraints and repeat.

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