How do you calculate EV charger rework cost?

Multiply the number of units needing rework by the rework cost per unit, then multiply by the share of that occurrence you are assigning, and add fixed engineering and containment costs. With 64 units at $145 each, a 100% assigned share, and $2,400 in adders, the total is $11,680.

What does the assigned occurrence share do?

It scales the variable rework cost to the portion of the problem attributable to the cause you are analyzing. At 100% you own all 64 units' rework; at 50% you would carry only $4,640 of the $9,280 variable cost, useful when a defect is shared between supplier and process.

What is the rework cost per affected unit here?

It is $182.50 — the $11,680 total spread across the 64 affected units. That per-unit figure folds in both the $145 hands-on rework and a share of the $2,400 fixed engineering and containment adders.

What counts as engineering and containment adders?

Fixed costs that do not scale per unit: failure-analysis engineering hours, a containment sort, updated work instructions, retest fixture setup, and any 8D documentation. Here that is $2,400 on top of the $9,280 variable rework.

Is rework cheaper than scrapping the charger?

Usually yes for a $145 rework on a charger module worth hundreds in BOM, but not always — if rework risks latent isolation or thermal damage, scrap-and-rebuild can be safer and cheaper over the warranty horizon. Compare per-unit rework against scrap value plus warranty risk.

How do I lower charger rework cost?

Attack the largest occurrence share first, drive first-pass yield up at the test station that catches the defect, and reduce fixed adders by standardizing the containment and FA playbook so each new event does not re-incur the full $2,400.

EV Charging Infrastructure Manufacturing calculator

Rework Cost Calculator

Rework cost is the dollar value a charger plant burns re-touching units that failed inspection, in-circuit test, or HiPot before they can ship. EV charging infrastructure carries unusually high rework stakes because a single AC/DC module pulls in PCBA labor, conformal-coat redo, retest, and often a containment review for safety-critical firmware and isolation faults. Quality engineers and operations managers use this number to size scrap-and-rework reserves, prioritize corrective actions, and defend the cost-of-poor-quality line in a PPAP or program review. When you can attribute a slice of total rework to one defect mode, the assigned occurrence share keeps you from overstating a problem you only partially own.

What this calculator does

Estimate EV charger rework cost from affected units, labor/material cost per rework, occurrence share, and fixed support adders.
a quality manager needs to quantify charger rework impact from a defect or build issue
It computes the total cost of reworking failed EV charger units by combining a per-unit variable cost across the affected units, weighted by an assigned occurrence share, plus fixed engineering and containment adders.

Formula used

Variable rework cost = reworked units × rework cost per unit × assigned occurrence share
Total rework cost = variable rework cost + engineering and containment adders

Inputs explained

Chargers or modules requiring rework:
Rework labor and material cost per unit:
Rework occurrence share assigned:
Fixed engineering and containment adders:

How to use the result

Use it when scoping the cost-of-poor-quality for a specific defect mode, building a rework reserve for a charger build, or quantifying the savings case for a corrective action.
It assumes a single blended rework cost per unit; mixed failure modes with very different teardown depths (a reflashed firmware fix versus a full power-stage replacement) should be modeled separately or the average will mislead.

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 EV charger rework cost? Multiply the number of units needing rework by the rework cost per unit, then multiply by the share of that occurrence you are assigning, and add fixed engineering and containment costs. With 64 units at $145 each, a 100% assigned share, and $2,400 in adders, the total is $11,680.
What does the assigned occurrence share do? It scales the variable rework cost to the portion of the problem attributable to the cause you are analyzing. At 100% you own all 64 units' rework; at 50% you would carry only $4,640 of the $9,280 variable cost, useful when a defect is shared between supplier and process.
What is the rework cost per affected unit here? It is $182.50 — the $11,680 total spread across the 64 affected units. That per-unit figure folds in both the $145 hands-on rework and a share of the $2,400 fixed engineering and containment adders.
What counts as engineering and containment adders? Fixed costs that do not scale per unit: failure-analysis engineering hours, a containment sort, updated work instructions, retest fixture setup, and any 8D documentation. Here that is $2,400 on top of the $9,280 variable rework.
Is rework cheaper than scrapping the charger? Usually yes for a $145 rework on a charger module worth hundreds in BOM, but not always — if rework risks latent isolation or thermal damage, scrap-and-rebuild can be safer and cheaper over the warranty horizon. Compare per-unit rework against scrap value plus warranty risk.

Last reviewed 2026-05-12.