Sunfire’s Solid Oxide Electrolysis Cell (SOEC) development started in 2012 based on long-term experience with Solid Oxide Fuel Cell (SOFC) stacks.
Although research in SOECs and reversible SOFC technology (RSOC) is in its early stage of development, The Boeing Company and Sunfire to-date have presented results of the largest known, fully integrated, automated, and grid tied RSOC system. The system consisted of two identical submodules with maximum power of 100 kWAC in SOEC mode and 20 kWAC SOFC power each. The system has a storage capacity of 600 kWh.
A particular advantage of this system compared to competing technologies is its ability to store an infinite amount of energy solely based on available H2 storage capacity. The fuel cell unit has more than 1,000 hours of operation since end of 2015 and successfully completed a 100 hour demonstration using sea water for cooling and electrolysis (Status: Q2/2016).
As a result of the reversible operation, a single system based on reversible solid oxide cells has been developed that addresses multiple market segments which include renewable H2 production, power to gas, energy storage, grid balancing, and fuel flexible distributed power Generation.