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I don't think this is really a great idea. First of all your going to loose more than 1/3 the energy you pulled off the grid in the first place. Secondly a large number of inverters feeding energy back into the grid that don't have a sinusoidal output could cause major havoc and even damage to the grid.
Any one thinking they can make money by storing and feeding power back to the utility can pretty much forget it. To feed power back onto the grid you must have a dual rate meter with a shut off control in case the power goes out so you don't fry the line man repairing the problem. In most states utilities are not required to buy back power at the same price they sell it and if they are there is a clause that usually says you must produce the same amount of power you use or more.
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