I went last year to a solar-show in Munich, and watched a number of demonstrations and talked to one smart engineer. In the current design, with around 16 panels and a battery rack in the basement, I could supply all the power I needed for the house (freezer and refrigerator included) and easily charge up the car, but timing came into play.
Based on the averages of sunshine per day...this would only cover about 280 days a year (central Germany location). So I’d have to continue to be tied to the grid. The other issue was that you’d typically charge the electrical car....after 6 PM, and this would eat up the charge on your solar potential collected and stored in the stupid batteries. With sun out till 10 PM in the summer....it would work out. The other six months of the year, no such luck.
So I brought up the wind business, and they had several ‘quiet’ wind collectors and this could figure into this. I’ve seen some Icelandic engineers who seem to have a hot project in the future for wind collection. But it just means an awful lot of infrastructure and you having to continually monitor your entire system for maintenance issues.
There's the rub...the entire electrical infrastructure (fuel, power plants, transmission, local distribution) has to be sized for those days when you don't get power from the sun. So you have to pay twice, once for the power plant on your house and the second time for the utility plant. OR you pay for an enormous battery system at your house to get you through those 85 days without sun power.
Elon Musk is betting heavily that people WILL put in huge battery banks at their houses. That's what his "GigaFactories" are for. But they are slow getting built and into production.