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What the inverter needs to do
The winning inverter will be the one that achieves the highest power density and meeting a list of other specifications, as determined by a panel of judges, while undergoing testing for 100 hours.
In brief, the other specifications are :
Must be able to handle up to 2 kVA loads
Must achieve a power density of equal to or greater than 50 W/in3
Must be able to handle loads with power factors from 0.7–1, leading and lagging in an islanded mode
Must be in a rectangular metal enclosure of no more than 40 in3 =3,4 Inch Kantenlänge= 8,6 cm Kantenlänge
Das entspricht 8,6 cm Kantenlänge

Will be taking in 450 V DC power in series with a 10 Ohm resistor
Must have a total harmonic distortion + noise on both voltage and current of less than 5%
Must have an input ripple current of less than 20%
Must have an input ripple voltage of less than 3%
Must have a DC-AC efficiency of greater than 95%
Must output 240 V, 60 Hz AC single phase power

Must maintain a temperature of no more than 60°C during operation everywhere on the outside of the device that can be touched.
Must conform to Electromagnetic Compliance standards as set out in FCC Part 15 B
Can not use any external source of cooling (e.g. water) other than air
Does not require galvanic isolation

Our testing philosophy is to not look inside the box.
You provide us with a box that has 5 wires coming out of it:
two DC inputs,
two AC outputs and grounding connection

and we only monitor what goes into and comes out of those wires, along with the temperature of the outside of your box, over the course of 100 hours of testing.

The inverter will be operating in an islanded more—that is, not tied or synced to an external grid.
The loads will be dynamically changing throughout the course of the testing, similar to what you may expect to see in a residential setting.
A more detailed description of the technical specifications for the inverter, the testing procedure and the requirements for technical approach and testing application can be found in this document.

Specification zu Google Contest DC AC Konverter
Google Contest zum Bau eines DC – AC Konverters mit 8cm Kantenlänge und 2 kW