EV Charging Infrastructure Manufacturing worked example

Power Module Yield at 69% target power module first-pass yield: a worked example

Suppose target power module first-pass yield falls to 69%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate first-pass yield for EV charger power modules from modules that pass test versus modules tested.

The inputs for this scenario

  • Power modules passing first-pass test: 188 modules (held at the documented default)
  • Power modules tested: 200 modules (held at the documented default)
  • Target power module first-pass yield: 69 % (the input this scenario stresses; the baseline uses 96)

Working through the calculation

  • The calculation starts from the formula this tool documents: Power module first-pass yield = passing power modules ÷ power modules tested × 100.
  • Power module first-pass yield works out to 94 % at these inputs, and this is the headline figure for the scenario.
  • Gap to power module yield target works out to -25 points at these inputs.
  • Power modules passing first-pass test works out to 188 modules at these inputs.
  • Power modules tested works out to 200 modules at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target power module first-pass yield sits at 96% and the headline result is 94 %, this scenario lands almost exactly on the baseline at 94 %.
  • It computes first-pass yield as passing power modules divided by tested power modules, then subtracts that from your target to show the gap in percentage points. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Power module first-pass yield: 94 % (headline result)
  • Gap to power module yield target: -25 points
  • Power modules passing first-pass test: 188 modules
  • Power modules tested: 200 modules

Run it with your numbers

  • To rerun this with your own numbers, open the live Power Module Yield calculator, set target power module first-pass yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.