Hydrogen Electrolyzer & Fuel Cell Manufacturing calculator

Stack Rework Cost Calculator

Estimate the dollar cost of stack rework. Enter how many stacks were reworked in the period, the average rework cost per stack (labor plus replaced MEAs, gaskets, or plates), the share of the stack that is actually opened up and touched, and a fixed rework setup or MRB cost. The calculator returns the variable rework cost and the loaded total.

What this calculator does

  • Estimate per-stack rework cost from the count of stacks reworked, average rework cost per stack (labor plus replaced MEAs, gaskets, plates), the share of the stack actually touched, and a fixed rework setup or MRB cost.
  • Use it when a quality engineer or production manager is sizing the dollar drag of stack rework after a leak-test or voltage failure spike and needs an honest number for finance and the corrective action plan.
  • It returns the dollar drag of stack rework in the period, including a fixed line for MRB and rework jig setup.

Formula used

  • Variable stack rework cost = stacks reworked × rework cost per stack × share of stack touched
  • Total stack rework cost = variable rework cost + fixed rework setup or MRB cost

Inputs explained

  • Stacks reworked in the period: Use the count of stacks that went through rework after assembly or test failure in the same period.
  • Rework cost per stack: Use the average rework labor cost plus replaced MEAs, gaskets, or plates per rework event.
  • Share of stack touched: Use the share of the stack actually opened up (100 percent for full disassembly; 20 to 40 percent for a localized leak rework or end-plate re-torque).
  • Fixed rework setup or MRB cost: Add fixed cost for MRB review, rework instructions, jig setup, or precious metal reconciliation.

How to use the result

  • Use it after a leak or voltage failure spike, during quarterly cost-of-quality review, or when justifying capital for an in-line leak test or compression-monitor that would prevent rework downstream.
  • It is a cost view. Rework also delays shipments and absorbs test bench capacity; pair with the leak test capacity, EOL test utilization, and production ramp capacity calculators when rework is meaningful.

Common questions

  • Should I include scrap stacks here? No. Use this calculator only for stacks that were reworked and shipped. Track scrapped stacks separately because the dollar treatment is different (scrap is a write-off, rework is a recoverable cost).
  • What does share of stack touched do? It scales the per-stack rework cost by how much of the stack is actually disassembled. A full re-torque without disassembly is closer to 10 to 20 percent; a full MEA replacement is 100 percent.
  • Why include a fixed adder? MRB review, rework instruction writing, scrap reconciliation, and precious-metal accounting are real costs that do not scale per stack. Putting them in the fixed adder gives finance the right number.
  • How do I treat a rework that requires a new MEA? Roll the replacement MEA cost into rework cost per stack. The variable line will then carry the right magnitude per touched stack.

Last reviewed 2026-05-12.