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If KWH charges are 50c a KWH, it might be cheaper to use your own generator during that period. I have a live aboard boat(as well as my home) with a bank of deep cycle batteries - 410amp/hr is enough to run economically with less than 50% discharge per day. OK so that is pretty frugal, as it only works out to 2 1/2 kw/hrs. If you run the charger/inverter during the day for 4 hrs you are sweet.
But in a home, you could do that with 14 panels and some batteries and the inverter.
That means total disconnection from the mains - they don't like it, but they are obliged to do it if you request it.
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