Power Core – Efficient electricity generator

Sunfire's key technology is the Solid Oxide Power Core – a stack of high-temperature Solid Oxide Cells (SOCs).

Solid Oxide Cells convert chemical energy from a gaseous fuel into electricity and heat through a chemical reaction with an oxidizing agent (oxygen from air) in a continuous process. Unlike conventional fuel cells, which only run on hydrogen, Sunfire fuel cells can also be operated with different hydrocarbons, such as natural gas, bio gas, liquid petroleum gas (LPG) and several liquid hydrocarbon fuels (methanol, ethanol, diesel).

Furthermore, the stack is designed to match the needs of highly efficient fuel cell systems by providing very low pressure drops (both on the fuel and the air side) and a high fuel utilization by its optimized gas distribution.

The customer benefits from a long experience with more than two million hours of operation experience in the field and a cost-optimized stack design consists of electrolyte supported, planar cells, using a sheet metal cassette as an interconnector. The Sunfire stack design is best suited for a large scale industrialized production due to its composition of easy to source materials and its producibility in simple standard manufacturing processes.


Manifold design:

Closed Anode, open Cathode


Partially stabilized Zirconia


Nickel cermet


Lanthanum based perovskites


Stamped and laser-welded ferritic steel plates (coated)

Operation gases:


Natural gas

Other hydrocarbons (LPG, Diesel)


Dimensions ( h × w × d):

116 × 160 × 182 mm³


< 14 kg

Rated power output under reference conditions:

850 W

Power output and efficiency (LHV) under steam reformate (s / c = 2) at reference operation voltage:

700 W

Power output and efficiency (LHV) under CPOX reformate (λ = 0.3–0.32) at reference operating Voltage:

750 W

Nom. operation temperature:


Max. fuel utilization:

85 %

Max. air utilization:

30 %

Stack electrical efficiency under reference conditions with different operation voltages:

42 % @ 0,7 V

45 % @ 0,75 V

48 % @ 0,8 V

Stack electrical efficiency under steam reforming conditions at different operation voltages:

47 % @ 0,7 V

50 % @ 0,75 V

54 % @ 0,8 V

Gases need to be clean from contaminants like Sulphur and chlorides. Hydrocarbon fuels are usually converted to syngas in a reforming process (catalytic partial oxidation – CPOX or steam reforming – SR). The power output and the resulting efficiencies include the reforming process of the reformer and are measured at the reference operating voltage. Higher voltages and higher fuel utilizations can lead to higher efficiencies but might decrease the power output.

Reference data above is for better comparison and reproducibility always given under these reference conditions that can easily be readjusted at the customer site.

Reference gas composition

40 % Hydrogen

60 % Nitrogen

Operation voltage per cell

0,7 V

We are open
to new ideas

Do you have a project in mind? Are you looking for an expert in the field of renewable power generation and energy storage?

Please, feel welcome to contact us for further information on our products, for more details on our partnership model and the possibilities to work on a joint project. We will be happy to discuss the options with you.

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