EV Charging Infrastructure Manufacturing worked example

Production Ramp Gap at 94% expected ramp uptime: a worked example

What does the result look like when expected ramp uptime reaches 94%? The full calculation is worked below with real intermediate numbers. a production manager needs to compare ramp capacity with planned charger demand

The inputs for this scenario

  • Chargers produced per ramp cycle: 6 chargers / cycle (unchanged)
  • Available ramp production cycles: 120 cycles (unchanged)
  • Expected ramp uptime: 94 % (raised for this scenario; the documented default is 82)
  • Expected ramp first-pass yield: 88 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross ramp capacity = chargers per ramp cycle × available ramp cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 596 units for good charger ramp capacity, the number this scenario is built around.
  • At this operating point the engine returns 720 units for gross charger ramp capacity.
  • At this operating point the engine returns 43.2 units for ramp capacity lost to downtime and disruption.
  • At this operating point the engine returns 81.22 units for ramp capacity lost to defects and rework.

How this compares with the baseline

  • Against the tool's baseline example, where expected ramp uptime sits at 82% and the headline result is 520 units, this scenario comes in 14.63% above the baseline at 596 units.
  • A figure at this level is achievable when expected ramp uptime is genuinely sustained, not just peaked for a shift. It applies single ramp-average uptime and yield figures, but both improve over a learning curve, so a flat estimate understates late-ramp output and overstates early-ramp output.

Results at a glance

  • Good charger ramp capacity: 596 units (headline result)
  • Gross charger ramp capacity: 720 units
  • Ramp capacity lost to downtime and disruption: 43.2 units
  • Ramp capacity lost to defects and rework: 81.22 units

Run it with your numbers

  • Every input above is editable in the live Production Ramp Gap calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.