The Swiss adventurer and solar pioneer Raphael Domjan will venture into the stratosphere, only with the sun energies’ help, in 2018. Onboard are the three high performance battery storages by the Austrian Cleantech start-up Kreisel Electric. They are lighter than the comparable lithium ion batteries. Due to their efficient thermo-management, the innovative energy storages are also usable at the edge of space.

A 32 kilowatt electric motor drives the four-winged plane propeller. Energy is provided by twenty-two square meters’ solar panels. The Energy is buffered into three special battery storages. The light weight lithium ion batteries are only accounted for 4,1-kilogram kilowatt hour of stored energy and thus are more than 25 percent lighter than comparable battery storages.

The supplier, Kreisel Electric, is a start-up from Upper Austria and specialized in highly efficient energy storages. “It is challenging to arrange them for the peculiar conditions in 25 kilometres altitude: 70 degrees below zero and the extreme low compression are challenging”, says Kreisel CTO Philipp Kreisel. The unique thermal management contributes a lot: the casing around the cells is constantly flushed with liquid which can heat or cool the batteries.

Beginning in November, start, landing and emergency scenarios are trained in a flight simulator on a hangar on the Payerne Airport Aeropole in Canton of Vaud, Switzerland. The record-breaking flight will take place in 2018. The 25 000 meters up to the edge of space will take two hours. He will then have 15 minutes to explore the stratosphere, eventually the way down will take up to three hours.