I have an incremental backup power plan.
Level 1 (short enough that the freezer doesn't thaw)
This one has been employed several times
Just run some fans, maybe a TV and lights
75 Ah AGM Battery
2000 Watt Pure Sine Wave Inverter
Level 2 (A day or two, but if weather is hot skip to Level 3)
fans, TV, lights, refrigerator, freezer.
Two 75 AH AGM Batteries in parallel
2000 Watt Pure Sine Wave Inverter
Level 3 (a couple of days)
This has been employed once.
small room A/C, fans, lights, refrigerator, freezer
Two 125 AH AGM Batteries (75 pounds each, so I ain't breaking these bad boys out unless I have to)
6000 Watt Inverter (Big Inverter and batteries are mounted in a wooden framework on wheels)
If the weather is really hot, then I might hook up a second window A/C unit to the 2000 Watt inverter and the pair of 75 AH AGM Batteries.
Level 4 (days not weeks)
Cook most of the food in the fridge, put the rest in a small refrigerator (milk, eggs, butter, etc.), and shut down big refrigerator, keep running freezer (very efficient non-frost free), room A/C, fans, lights.
Two 125 AH AGM Batteries, two 75 AH AGM Batteries (run two at a time and recharge two at a time with propane genny and 2 30 amp chargers)
Level 5 (weeks)
Bug out