EV & Battery Manufacturing worked example

Cell Grading Buffer Coverage with graded cell inventory on hand of 240,000 cells: a worked example

Push graded cell inventory on hand up to 240,000 cells and the picture changes. This example computes every intermediate figure at that operating point. a module assembly planner needs to know whether graded cells can cover the next production window

The inputs for this scenario

  • Graded cell inventory on hand: 240,000 cells (raised for this scenario; the documented default is 96,000)
  • Daily graded-cell demand: 18,000 cells / day (unchanged)
  • Grading buffer safety factor: 1.25 x (unchanged)

Working through the calculation

  • Applying the documented formula (Unprotected graded-cell days = graded cell inventory รท daily cell demand) to the inputs above produces each figure below.
  • At this operating point the engine returns 10.67 days for protected graded-cell coverage, the number this scenario is built around.
  • At this operating point the engine returns 13.33 days for unprotected graded-cell days.
  • At this operating point the engine returns 240,000 cells for graded cell inventory.
  • At this operating point the engine returns 18,000 cells / day for daily cell demand.

How this compares with the baseline

  • Against the tool's baseline example, where graded cell inventory on hand sits at 96,000 cells and the headline result is 4.27 days, this scenario comes in 150% above the baseline at 10.67 days.
  • It computes protected graded-cell coverage as inventory divided by daily demand, then divided by the grading buffer safety factor. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Protected graded-cell coverage: 10.67 days (headline result)
  • Unprotected graded-cell days: 13.33 days
  • Graded cell inventory: 240,000 cells
  • Daily cell demand: 18,000 cells / day

Run it with your numbers

  • Every input above is editable in the live Cell Grading Buffer Coverage calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.