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A couple of strategies come to mind:
1. do what you are thinking about with propane, we use our regular tank that is for the house also plumbed to provide for the genset - the electrical switchgear and interface with the utility will be key. You want something that is able to come on immediately (without your help) and that will turn off when grid power comes back. We've got such a setup in Napa and it works great, sized for your load is key.
2. investigate batteries + solar. Similar in function to above, without having to worry about running out of propane. Perhaps easier to permit depending on your location. You'll have the benefit of solar all the, and with the added battery backup you will have power when the grid goes away. Fewer moving parts, much quieter, a bit more elegant, provides a return on your investment from day one vs. a sunk cost that you only benefit from when the power is out.
3. Think about solar Hot Water at the same time - stupid simple technology that provides your hot water for free, essentially. You will still have your original fuel source (gas or elec) as a backup. Couple of 4x8 panels (size of the collectors) and you are all set.
Your mileage may vary -
TD
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