A good grid (because it's always windy somewhere), batteries for a day or two of low production (e.g. the batteries in electric cars, one of those can power the average home for several days), power-to-methane for cold winters without wind.
Though I have only a 24kWh battery (2015 LEAF), that’s nowhere close to powering my home for several days, even if I were able to park the car entirely during that time period.
Looks like the average US electricity consumption is close to 30 kWh/day.
