EV Charging Infrastructure Manufacturing worked example

Warranty Reserve at 1.3% expected warranty claim rate: a worked example in ev charging infrastructure manufacturing

Here is what the math looks like when conditions slip. We hold every other input steady and drop expected warranty claim rate to 1.3%, then walk the calculation through step by step. Estimate warranty reserve for EV charging equipment from shipped population, expected cost per claim, claim rate, and fixed program adders.

The inputs for this scenario

  • Shipped chargers or ports in warranty cohort: 8,400 units (held at the documented default)
  • Expected cost per warranty claim: 240 $ / claim (held at the documented default)
  • Expected warranty claim rate: 1.3 % (the input this scenario stresses; the baseline uses 1.8)
  • Fixed warranty program adders: 22,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Expected warranty claim cost = shipped population × expected cost per claim × expected claim rate.
  • Total EV charger warranty reserve works out to 48,208 $ at these inputs, and this is the headline figure for the scenario.
  • Warranty reserve per shipped charger/port works out to 5.74 $ / unit at these inputs.
  • Expected warranty claim cost works out to 26,208 $ at these inputs.
  • Fixed warranty program adders works out to 22,000 $ at these inputs.

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 17.29% below the baseline at 48,208 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to expected warranty claim rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. 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: 48,208 $ (headline result)
  • Warranty reserve per shipped charger/port: 5.74 $ / unit
  • Expected warranty claim cost: 26,208 $
  • Fixed warranty program adders: 22,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Warranty Reserve calculator, set expected warranty claim rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.