Commonality of Electrolysis Sub‐Systems for ISRU, Power, and Life Support for a Lunar Outpost

As details of an eventual lunar outpost evolve, it is clear that the various surface systems will have some common components. For example, fuel cells for nighttime power and long‐range rovers, the life support system, and the in‐situ resource utilization system will all generate water that will need to be electrolyzed into oxygen and hydrogen. While these various systems may require electrolysis at different rates, there are many benefits to developing a common system. These benefits include reduced development costs, commonality of spares, and the ability to provide critical backup. This paper evaluates the electrolysis sub‐system requirements for the four surface systems and the preferred design for each user. We then evaluate the advantages and disadvantages of relying on a single electrolysis sub‐system for all four surface systems. We also evaluate whether some or all of the electrolysis functions could be centralized at one surface system.