A couple of things:
Easto,
I am really not sure as it runs weekly checks and we use the grill. After 1 1/2 years, the tanks are still full. I doubt that we have used 20 gallons.
Generac says about 2 gallons at half load per hour and 3.6 at full load per hour. (Gallons not pounds like the 20 lb. cylinders that people use for grills, which only has about 4.5 gallons if you are lucky as the trade in tanks only fill 80% of the 80% that is allowed in a 20 lb. tank) LPG weighs about 4.2 pounds per gallon. I have 2 tanks and am on the priority list for refills due to my medical conditions.
If you have natural gas available or are able to put your tanks closer to genny, the initial cost would be considerably cheaper. Digging to bury the lines as far as they did at my place, made the LPG install cost higher than normal.
Humby,
I am sorry that you have to go through this...

I have a feeling that perhaps PGE is getting revenge and 'teaching a lesson' to the people that sued them for the previous fires...
Yes, they should be on a grid that can divert or reroute power as needed. With the population of CaliPr0nia and the dependency on electricity, the taxpayers will end up paying for upgrades with the PGE exec's laughing all of the way to the bank, like so many others have done before...
Wishing you the best!
P,
That is a diesel genny and that makes for many potential problems, such as getting permits for being able to store diesel (EPA, locals, etc.). Tanks- above ground or below, size, filling when needed as it must be delivered, also diesel will spoil if stored for say a year, more or less. Additives can help, although it is a crap shoot as they can still 'gunk' up inside and cause failure when you need them. (I did some research before deciding on propane as it doesn't go bad, is clean burning and delivery isn't really a problem.)
Natural gas is the way to go if it is available, although it takes more to equal the same btu's. Natural gas<LPG<diesel<gasoline. Considering gasoline for a stand by genny is not an option. Gasoline is only for small, portable genny's.
Humby, (Again because you are special!!!)
You might check into whether natural gas is available or LPG as a 2nd option. For what they paid for the small, portable (easy to steal) genny's, they probably could have bought a stand by as you don't really need an ATS (automatic transfer switch) as you could start it manually as needed, so your cost for say a 12 KW would probably be about $3000 and NG or LPG wouldn't be affected by Cali's clean air emissions laws. (As an example, LPG is used in any forklift that is used inside of a building, nothing else, that's a law...) If the cost is too high in Cali, consider that shipping cost from another state isn't as much as you would think.
Not to mention the potential liability of refilling gasoline into a hot genny's tank... Dangerous!!
People typically do not even try to steal stand-by gennys as they are tied in with electrical wires making them quite dangerous to tamper with. And they are quite heavy. Thieves do not want to work, if they did, they would get a job! LOL
You might get some kudos (can I get a WOOT!

) for researching this and talking to the owners as they have a lot of $$$ tied up in inventory and the potential loss of sales due to lack of power. It is a cost of doing business and a tax write off. (plus you could get a cot and use as a home when power is cut off as you, possibly getting paid for being their on security and product care! Do I smell a giant raise in your future!!!!!!!!!!!!!!!!!!!!1111111111111111111111)
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