Uniformity Analysis at MEA and Stack Levels for a Nexa PEMA Fuel Cell System

The Nexa power module is a small, low maintenance, and fully automated fuel cell system designed for integration into portable and back-up power products. The stack features a specified net power output of 1200 W at full load with about 26 V. The power module was evaluated at membrane-electrode-assembly (MEA) and stack levels, and uniformity analyses were conducted on a 800 W load for all MEAs in 10 individual Nexa stacks. The MEA voltage without external load averages 224 mV higher than that with a load of 800 W. The average difference is 8.8% and the highest is 13.1% between the minimum MEA voltage in the stack and the mean value.