“…However, first plants are already reaching an industrially relevant scale, e.g., the solid oxide electrolyzer built by Sunfire at the steel mill in Salzgitter, Germany has a nominal input power of P el,sys,nom,AC = 720 kW. [5] Even with first plants on a large scale having been implemented, operational data on solid oxide electrolyzers being operated as stand-alone plants are scarce. [6,7] Within this work, experimental data on an SOEL plant with a nominal electric power input of P el,stack,nom,DC = 12 kW are presented.…”