How do you calculate total stack rework cost?

Multiply stacks reworked by cost per stack by the share of the stack touched to get variable cost, then add the fixed setup or MRB cost. With 18 stacks at $850, 60% touched, plus $1,200 fixed, the total is $10,380.

What does share of stack touched mean?

It is the fraction of the stack actually disassembled and reworked on average. If a failure typically requires replacing about 60% of the cells or layers, only 60% of the per-stack cost is incurred — captured here as a 0.60 factor.

Why separate fixed MRB cost from variable rework?

Setup, disposition meetings, and MRB documentation cost the same whether you rework 1 stack or 18. Splitting them shows how much rework is volume-driven versus a fixed quality overhead you pay regardless.

What is the rework cost per touched stack?

It is the variable cost spread across the reworked stacks — here $576.67 per stack, which is the $850 nominal cost scaled by the 60% share touched. It is the effective variable cost each reworked stack carries.

How can I reduce stack rework cost?

Cut the count by fixing root-cause defects like seal leaks or MEA contamination, lower the share touched with better fault localization so you rework fewer cells, and reduce fixed MRB cost by streamlining disposition workflow.

Should scrapped stacks be included here?

No. This calculator covers stacks that are reworked and recovered. Scrapped stacks are a separate scrap cost; mixing them overstates rework and hides true scrap losses.

Hydrogen Electrolyzer & Fuel Cell Manufacturing calculator

Stack Rework Cost Calculator

Stack Rework Cost totals the money spent reworking electrolyzer or fuel cell stacks in a period, separating the variable per-stack rework from the fixed setup and Material Review Board (MRB) overhead. Quality engineers and stack production managers use it to size the true cost of leaks, crossover failures, contaminated MEAs, and end-plate torque issues that send stacks back to a rework station. Because most stacks are only partially reworked — a few cells replaced, not the whole stack rebuilt — the model applies a share-touched factor so cost reflects the actual scope of disassembly. It turns a scrap-and-rework line on a quality report into a defensible dollar figure for cost-of-quality reviews.

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 computes total stack rework cost as variable rework (stacks reworked times cost per stack times share touched) plus a fixed setup or MRB cost.

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:
Rework cost per stack:
Share of stack touched:
Fixed rework setup or MRB cost:

How to use the result

Use it in cost-of-quality reporting, when justifying a process fix, or when comparing rework spend across periods or defect modes.
It uses one average cost per stack and one share-touched figure; a mix of light teardown and full rebuilds in the same period will blur the true cost unless segmented.

Current U.S. benchmarks

Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.

Common questions

How do you calculate total stack rework cost? Multiply stacks reworked by cost per stack by the share of the stack touched to get variable cost, then add the fixed setup or MRB cost. With 18 stacks at $850, 60% touched, plus $1,200 fixed, the total is $10,380.
What does share of stack touched mean? It is the fraction of the stack actually disassembled and reworked on average. If a failure typically requires replacing about 60% of the cells or layers, only 60% of the per-stack cost is incurred — captured here as a 0.60 factor.
Why separate fixed MRB cost from variable rework? Setup, disposition meetings, and MRB documentation cost the same whether you rework 1 stack or 18. Splitting them shows how much rework is volume-driven versus a fixed quality overhead you pay regardless.
What is the rework cost per touched stack? It is the variable cost spread across the reworked stacks — here $576.67 per stack, which is the $850 nominal cost scaled by the 60% share touched. It is the effective variable cost each reworked stack carries.
How can I reduce stack rework cost? Cut the count by fixing root-cause defects like seal leaks or MEA contamination, lower the share touched with better fault localization so you rework fewer cells, and reduce fixed MRB cost by streamlining disposition workflow.

Last reviewed 2026-05-12.