You can buy any size propane tank you want, you don't have to rent them. I would go withy the largest you can get. You can always erect a privacy/lattice work fence around it if you want to.
You never know how long the power might be out. Our cabin is the very last connection on this string, so guess who goes out the most around here....luckily so far though the longest was just half a day, but ya never know.
I just have a gasoline genny now, but we do have a 250 gallon full propane tank that sits here unused, so I would like one of those whole house propane jobbies as well. The farm itself, the main broiler houses, has three whopper diesel backup gennies to keep those houses operating (5-10 minutes no electric power equals beaucoup loss of cluckers..., so this is taken seriously here), and the boss buys diesel by the tanker load. Those are automatic turn on, automatic test "exercise" runs, remotely monitored, yada yada, top shelf stuff.
That would be another option for me, diesel, but..I'd rather just use the propane that is sitting here. I would only be running the freezers and well pump mostly and some lights in an emergency. We don't run AC, and have wood heat, so, there ya go. Can cook with wood or propane as well.
I also have some solar backup, but just two panels/charge controller, etc. Enough for a light or two, run the laptop, keep phones charged, etc., plus it could keep my Oregon battery saw charged up swell
At one charge a day, easy enough to do and cut, I could theoretically do over ten cord a year. Now that's a guesstimate, but guessed after some weeks of hard use and review of the saw.
We always keep a lot of jugged up water handy and two food grade 55 gallon barrels full, I haven't had to run the well from the generator yet. In a real long term electricity outage, I can yank the pump and have a bore bucket.
Our gas genny is just a cheapo 5500 watt peak use one, nothing special, cheap and small, but better than nothing.
