Microgrid & Distributed Energy Equipment worked example

Warranty Reserve at 58% expected claim rate: a worked example in microgrid & distributed energy equipment

Here is what the math looks like when conditions slip. We hold every other input steady and drop expected claim rate to 58%, then walk the calculation through step by step. Estimate the warranty reserve to hold on shipped microgrid and distributed energy equipment, so finance and program teams can size exposure, compare claim-rate scenarios, or fold the reserve into the quote.

The inputs for this scenario

  • Units under warranty: 100 units (held at the documented default)
  • Warranty cost per unit: 45 $ / unit (held at the documented default)
  • Expected claim rate: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed program reserve: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable warranty reserve = units under warranty × warranty cost per unit × expected claim rate.
  • Total warranty reserve works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Warranty reserve per unit works out to 28.6 $ / piece at these inputs.
  • Variable warranty reserve works out to 2,610 $ at these inputs.
  • Fixed program reserve works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected claim rate sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to expected claim rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes one blended claim rate and cost per unit; real DER fleets have failure curves that rise with thermal cycling and firmware age, so revisit the rate as field data lands.

Results at a glance

  • Total warranty reserve: 2,860 $ (headline result)
  • Warranty reserve per unit: 28.6 $ / piece
  • Variable warranty reserve: 2,610 $
  • Fixed program reserve: 250 $

Run it with your numbers

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

Last reviewed 2026-05-12.