Ah, don’t ya just love the enthusiasm of the underdog? Green and Gold Energy of Adelaide, South Australia, sound as though they are poised to take on the heft of, not just the nuclear lobby, but also the solar industry, as well. They believe their SunBall Solar Appliance is the bee knees of domestic energy delivery. Their calculations suggest the Sunball should provide electricity to residences cheaper than current grid pricing. How are they going to manage this feat? Well, the Sunball (a bit smaller than a basketball) uses triple junction solar cells, which are apparently related to the same panels driving the Mars rovers, Opportunity and Spirit. A one square metre of flat panel made from such cells would supposedly cost about $100,000 AUD. So instead the Sunball uses them in 1cm2 configurations, and then places an optical acrylic Fresnel lens above the cell. This captures 500 times more light and focuses it down on the cell. More >