What if installing solar panels were as easy as rolling out a carpet? That's the promise of the Roll-Array, a powerful, flexible solar system that can be set up in two minutes flat. Meanwhile, Deltec has launched a line of solar-powered prefab homes that start under $100,000, and we spotted an amazing teardrop trailer that can operate completely off-grid thanks to roof-mounted photovoltaics. In other building technology news, Boeing debuted a new self-cleaning airplane bathroom that uses UV light to obliterate germs.