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Google and the IEEE Power Electronics Society are working with NREL at the ESIF on the Little Box Challenge, an open competition challenging engineers to build smaller power inverters for use in photovoltaic (PV) power systems.


Up to 18 finalists in the Challenge will be invited to bring their inverter to the ESIF in 2015 for testing and evaluation against the contest parameters. NREL’s world-class researchers will use the state-of-the-art capabilities of the ESIF to evaluate each inverter’s efficiency and performance during tests spanning 100 hours under the same set of typical operating conditions. The test results will help Google and IEEE decide the winner of the $1 million prize, which in 2016 will go to the team that designs and builds a kilowatt-scale inverter with the highest power density and that meets the contest’s other specifications.


The goal of the Little Box Challenge is to create a smaller,more efficient power inverter. Currently, inverters are about the size of a picnic cooler, and Google would like to see the technology shrink to the size of a small laptop computer or smaller. Shrinking the current inverter by 10 times or more and making it cheaper to produce and install would enable more PV-powered homes and more efficient distribution grids, and help bring electricity to remote areas. 

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Publication Date
Feb 2, 2015
Agreement Type
User Facility Agreement