When a single large electrolyser stack has to be shut down for maintenance or fails unexpectedly, the impact on site operations can be significant. For some users, hours or days of lost hydrogen supply mean:

• Process interruptions and lost production
• Increased reliance on backup fuels or delivered hydrogen
• Higher operating risk and planning complexity

In practice, every system needs maintenance. Components age, stacks degrade, and unexpected issues occur. A modular architecture acknowledges this reality and is built so that:

• Individual modules can be isolated and worked on
• The rest of the plant can keep running at partial load
• Field intervention is as straightforward as possible

This is particularly important in locations where specialist electrolysis expertise is not readily available on site.

A modular approach also supports staged growth. Rather than committing to a very large unit from day one, capacity can be built up over time by adding stack trays and associated modules as demand and confidence grow.

This can be a better match for organisations that want to move progressively, learning from early deployments before scaling.