Grid-Scale Battery Energy Storage Systems worked example

Module Yield at 68% target module yield rate: a worked example

Suppose target module yield rate falls to 68%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate battery module first-pass yield rate for grid-scale BESS production by comparing modules passing formation and capacity test against total modules tested, then measuring the gap to the yield target.

The inputs for this scenario

  • Battery modules passing formation and capacity test: 237 modules (held at the documented default)
  • Total battery modules entered into test: 250 modules (held at the documented default)
  • Target module yield rate: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Module first-pass yield rate = modules passing formation test / total modules entered into test x 100.
  • Module first-pass yield rate works out to 94.8 % at these inputs, and this is the headline figure for the scenario.
  • Module yield gap to target works out to -26.8 points at these inputs.
  • Modules passing formation and capacity test works out to 237 count at these inputs.
  • Total modules entered into test works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target module yield rate sits at 95% and the headline result is 94.8 %, this scenario lands almost exactly on the baseline at 94.8 %.
  • It computes the first-pass yield rate of battery modules through formation and capacity testing, then the point gap between that rate and your target. 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

  • Module first-pass yield rate: 94.8 % (headline result)
  • Module yield gap to target: -26.8 points
  • Modules passing formation and capacity test: 237 count
  • Total modules entered into test: 250 count

Run it with your numbers

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

Last reviewed 2026-05-12.