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You really need to be more specific. Exactly what do you want to run and how automatic do you want it to be. If you want completely automatic backup and want to run the entire house with things such as deep well pumps, electric heat, etc then you're talking 10's of thousands of dollars. If you want to select a few critical circuits which you can stage manually and you're only concerned about a few hours every few years then a portable unit may be fine. If you need to start induction motors it's essential to match the generator to the starting code for the motors. The starting code should be on the motors nameplate. Like others have said, fuel storage is a major factor. A couple 5 gallon jugs of gas will probably give you a few hours a day for several days. You'll need a plan to keep the fuel fresh. However if you want to run continuously for days at a time you better consider natural gas, propane, or diesel. My generator is a Dayton 7200W powered by a Honda 13 HP gas engine. My main concern is getting water during an outage. (I have a 1.5 HP deep well pump). I stage all circuits manually so the pump gets exclusive use of the generator when it kicks on. Once the tanks are filled, I turn of the well circuit and the generator can run everything else but my electric heat. (maybe it could, but I just use the stove for heat). Things are at there very worst during an outage. Unless you have a completely automatic system that has a weekly self test cycle, then you need to have periodic "practice outage" sessions. Will you have fresh fuel? Will the unit start? (rebuilding a gummed up carburator in the middle of the night a 20 below zero with candle light isn't much fun). Can you get it to the house if everything is covered in ice?? (once I wasn't able to get my sliding barn doors open due to ice. Luckily the genrator fit thru the walk in door but just barely!!). Do you have the proper connections?? (you can easily kill yourself fumbling with a generator.) I won't get into the backfeed debate!! You might want to checkout www.grainger.com. They have lots of info on generators. If money was no object, I'd sure like to have a portable Multiquip generator or a Kohler standby unit. You can stand right next to a Multiquip unit and have a normal conversation they are so quiet.
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