Panels are so cheap now that they pay even if you waste most of what they could have produced. A smallish battery that captures only some of the excess, and delivers it when you need it, suffices. Battery cost is still falling fast as new chemistries come online. Hydrogen synthesis and storage might displace batteries for domestic use, particularly if hydrogen-fueled cars succeed. (Advice: keep all that equipment outside!) If not, zinc/bromine battery tech looks strong.