Batteries used to help match supply and demand are one thing, going off grid is just stupid if you have one available.
Ohh, I don't know about that.
Here in far north New Zealand the daily connection charge is now around $3.50, while what they'll pay you for electricity you generate and send them is around $0.10/kWh.
So if you have enough solar panels to generate your own needs, and enough battery to get you through a daily cycle in bad weather, you need to be sending them 35 kWh a day just to pay for the connection charge.
I average about 16 kWh/day of use over the year (20/day average in Feb and July, with the odd 25/day peak) and that's with electric water heating and heat pump in summer and winter (from now to mid November, and in April, I don't use either heating or cooling, but most of the year do). If I was going off grid I could reduce that quite a lot by switching to bottled gas for heating (including water heating). Actually I already use a wood fire for winter nights (and sometimes days) -- this year I've used $260 worth of fire wood (3 m^3 at $80, plus $20 delivery fee). I already use bottled gas for cooking -- a $40 refill does about a year of cooking.
Running AC when the sun is shining seems like an ideal use of solar power.
Generators are cheap to buy (though expensive to run) for those odd times when solar isn't enough and you'd be tempted to draw from the grid.
I'd have to work out precise figures, but the main reason I haven't gone off-grid already is the capital cost and that I don't own this place and probably won't be here long term. It certainly looks attractive to me, financially!
NB all prices are NZ$, currently US$0.60, AU$0.91, £0.46.