And big enough to keep Exxon stock rising. Fool's errand. I'm from Alaska and can tell you generator power is a bad option. Not only fuel costs but generator upkeep as well. There ain't no such thing as "a" generator because you need another as backup. It's far cheaper in the short run to pay for the poles and the span to get juice to your property. Then begin installing a solar array and battery bank. By law you MUST hook up to the grid (stupid law) but you get paid if you generate more than you can use.
If you got the money then get this
http://www.emergencypower.com/dieselgenerators/home#!/~/product/category=3128634&id=13428566
This will more then do the job and you can run this hot shit for months. Put it in your garage and make sure the it's well ventilated. Also, put an acoustic box around it to (make sure that is also well ventilated). Always use diesel generators, if you are gong to go that route. Also, in reference to a solar setup. If you live in Florida then you can do an off grid setup. If you are going to go off grid then make sure you use forklift batteries (I would suggest 10 or more ). Run them parallel to. Here's a trick to off set the power company via smart meters. IF you cannot afford an off grid setup then still get the forklift batteries and a charger for it. Then hook it it up to a power inverter. A FPL guy said the smart meters can tell if you are ding a 12/12 or/and 18/6. The battery bank will off set this...especialy if you are using a ups for each grow light. The smart meter will think you are just charging shit all day. Think about it...the solar panel acts as a power source....if you cannot afford it then bit the bullet and use your home power to for the forklift battery charger; for which charges the battery; for which hooks up to the power inverter; for which hooks up to the powerstrip/ups..etc. YOu cannot lose trust me.
Or use that diesel generator, I made reference to, then you can have it run either have to time to off set the power company (example: make it run half of the time when you conduct a 18/6 for veg and the same concept applies for the 12/12.
18/6 (The generator runs for 9 hours out of the day.
12/12 (The generator runs for 6 hours out of the day.
The remaining hours will run on grid. You cannot lose my friends. Just make sure all your lights are hooked up via UPS.