While standalone solar systems produce electricity with high efficiency, only a fraction of this energy can be used. Without a plausible way to capture the unused energy, you are either throwing it away or selling it back to the grid.
A Nanotech Energy solar battery allows you to capture and store the excess energy, opening up the possibility of going off-the-grid. This energy can be released for use at night or during times of heavy consumption. The development of high-power battery packs can accelerate the growth of green technology.