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Coming back to the original question, target than ask this talk on feed in tariffs. If it worth it to build an offgrid solar system. To go fully offgrid for a normal house is going to require significant investment, you are going to need at least 2 times your daily power consumption in usuable battery storage and the ability to recharge that battery storage inside a day.
So take 15kw/hr a day house.
Thats at least 30kw/hrs of usable battery power (which could means upto 45kw/hrs of s storage to cater for depth of discharge) and at least 6kw of solar (recharge on a winters day)
That's not a cheap system in today's tech. The over spec is needed to cater for those cloudy/rainy days (sorry you can't use the fridge today as we have no power).
Hydrid solutions are probably a better idea, (like the Tesla power wall) where they store a few hrs of power to get you through the peak evening period and you buy from the grid and excess you can't supply locally.
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