Hydrogen production and conversion technologies increasingly operate under dynamic and application-specific conditions, where stack reliability and efficiency are critical to overall system performance and cost. This paper explores the role of Cell Voltage Measurement (CVM) as a key enabler for high-resolution monitoring across a wide range of electrolysis and fuel cell systems. Drawing on practical implementation experience and field observations, CVM enables continuous visibility of cell-level voltage distribution and provides early indication of degradation phenomena such as cell imbalance, gas crossover, and localized performance deviations.

Operational insights show that early identification of underperforming cells can significantly reduce the risk of accelerated degradation, unplanned downtime, and irreversible stack damage. From a techno-economic perspective, even marginal efficiency improvements at stack level (≈1%) can translate into measurable gains in hydrogen output or reductions in specific energy consumption over system lifetime—directly improving operational expenditure and overall system profitability.

The paper further discusses key engineering challenges, including high common-mode voltages, signal integrity, and reliable data acquisition in harsh and potentially hazardous (ATEX) environments. Leveraging proven approaches in industrial connectivity, including robust interfacing and fuse protection strategies, scalable and reliable CVM architectures are outlined for next-generation hydrogen applications.