How long do you wait to haul out the generators?

Depends on how cold it is or how long the anticipated outage is.

Last time I had to run a generator was when I was still in NY. Ran 72 hours after a tornado took down a tree and a pole. We were on a main line so normally we were one of the first back on-line. This time, they couldn't put up a pole until someone moved the tree. It took them a couple of days to get someone with a saw big enough. Our state road crew had a 36" saw but it wasn't going to work on this massive maple.
 
Usually I'll give the powerco 15 minutes or so to finish their automatic switching / rerouting. If it's not back on by then the generators get fired up.

We have electric horse / dog fencing and I don't like to leave it off too long. Plus my elderly mother in law is on the same electrical service as my shop, so I'm typically firing up 2 generators.

I finally finished the wiring to my 200A automatic transfer switch. Now just need to pressure test the 1000 gallon propane tank that I have sitting in the boneyard and bury it for the 35KW surplus Progress Energy Generator that I picked up last year. That will be a permanent installation wired into the ATS. After that I'll just have to worry about the shop / MIL generator.
35kw on a 1000 gallon tank? It should work at 50% load as long as you don't let it get too low or it's not too cold out. If it's an underground tank, that should help it some.

You might end up with a giant ice ball, 30% in the tank, and a generator that won't run.
 
35kw on a 1000 gallon tank? It should work at 50% load as long as you don't let it get too low or it's not too cold out. If it's an underground tank, that should help it some.

You might end up with a giant ice ball, 30% in the tank, and a generator that won't run.
Liquid feed, buried tank.
 
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