GM boosted the stack standard through further developments in materials, says Gary Stottler, director of stack development at GAPC, and by "improving how we form parts of the fuel cell and how the stack is put together."
The new stack has 640 cells with a continuous power output of 134 horsepower and a peak power output of 173 horsepower. It weighs 82 kg and measures 82 cm by 14 cm by 50 cm, or 58 liters.
Continuous power is the power that systems are designed to run on indefinitely, explains Stottler, while peak power is the power that systems are designed to support for brief periods during launch or passing move.
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