EV Charging Infrastructure Manufacturing worked example

Warranty Reserve at 2.07% expected warranty claim rate: a worked example in ev charging infrastructure manufacturing

What does the result look like when expected warranty claim rate reaches 2.07%? The full calculation is worked below with real intermediate numbers. a finance or quality team needs warranty reserve for a charger shipment cohort

The inputs for this scenario

  • Shipped chargers or ports in warranty cohort: 8,400 units (unchanged)
  • Expected cost per warranty claim: 240 $ / claim (unchanged)
  • Expected warranty claim rate: 2.07 % (raised for this scenario; the documented default is 1.8)
  • Fixed warranty program adders: 22,000 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Expected warranty claim cost = shipped population × expected cost per claim × expected claim rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 63,731 $ for total ev charger warranty reserve, the number this scenario is built around.
  • At this operating point the engine returns 7.59 $ / unit for warranty reserve per shipped charger/port.
  • At this operating point the engine returns 41,731 $ for expected warranty claim cost.
  • At this operating point the engine returns 22,000 $ for fixed warranty program adders.

How this compares with the baseline

  • Against the tool's baseline example, where expected warranty claim rate sits at 1.8% and the headline result is 58,288 $, this scenario comes in 9.34% above the baseline at 63,731 $.
  • A figure at this level is achievable when expected warranty claim rate is genuinely sustained, not just peaked for a shift. It assumes a single blended cost and claim rate; real EV charger failures cluster early (infant mortality) and again near end of warranty, so a flat rate can mis-time the reserve across the warranty life.

Results at a glance

  • Total EV charger warranty reserve: 63,731 $ (headline result)
  • Warranty reserve per shipped charger/port: 7.59 $ / unit
  • Expected warranty claim cost: 41,731 $
  • Fixed warranty program adders: 22,000 $

Run it with your numbers

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

Last reviewed 2026-05-12.