EVCare
Hydrogen fleets
How a hydrogen fuel-cell stack ages
Like a battery, it wears with use — just in its own way.
What it does
1
Hydrogen in
fuel from the tank
›
2
The stack
hydrogen meets air
›
3
Out
electricity, plus water
Power fades over time
100%years →knee of the curve
Stack power slowly declines across its service life · illustrative
Why it wears · 1
The membrane thins
The thin layer at the stack's heart slowly degrades with heat and humidity.
Why it wears · 2
The catalyst is lost
The precious-metal layer that speeds the reaction gradually thins.
Why it wears · 3
Stress adds up
  • Starting and stopping strains the cells
  • Heat accelerates every wear mechanism
  • Hard duty cycles age a stack faster
Two things age at once
The fuel cell
  • Membrane wear
  • Catalyst loss
  • Makes the power
The battery
  • Capacity fade
  • Resistance growth
  • Buffers the power
Why measure it
Catch decline early
  • ✓Plan refurbishment before power drops too far
  • ✓Avoid surprise downtime mid-route
  • ✓Prove condition at resale or handback
One picture
Fuel-cell health
how the stack is aging
Battery health
how the pack is aging
Fleet readiness
can this bus run today's route?
Hydrogen fleets deserve battery-grade intelligence.
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