CE+T Power of Belgium has won the Google/IEEE Little Box Challenge. They receive a million-dollar prize for building an extremely small (13.77 in3 / 225.6 cm3) 2-kW power inverter (above). Their design documentation can be read online (Gallium Nitride power transistors are a key element).
Well done, guys! I look forward to the improvements this will bring to solar power and small-scale power generation for remote areas.