The Vehicle Electronics department at Fraunhofer IISB has reached the final of the “Little Box Challenge” organized by Google. The aim of the international competition is the development of a 2 kW solar inverter with efficiency of over 95 % in order to drive forward the use of regenerative energies. The IISB solution is one of the world’s smallest inverters and can boast an outstanding performance density of 200 W/in³. With a highly compact design based on 900 V SiC semiconductor switches that also allow high switching frequencies of 140 kHz with low loss, the efficiency of the “Little Box” is over 96 %. As one of 18 finalists from over 100 entrants, our box did not pass the severe testing and the price goes to CE+T, which had a power density of 142.9 W/in³ and passed the test faultless.