Power Electronics, Motors & Drives worked example

Inverter Assembly Cost at 58% build volume captured: a worked example in power electronics, motors & drives

Here is what the math looks like when conditions slip. We hold every other input steady and drop build volume captured to 58%, then walk the calculation through step by step. Estimate inverter assembly cost from build volume, per-unit labor or material cost, the share of units in scope, and any fixed launch or validation adder.

The inputs for this scenario

  • Inverter assemblies in scope: 100 assemblies (held at the documented default)
  • Assembly cost per inverter: 45 $ / assembly (held at the documented default)
  • Build volume captured: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed inverter program adder: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable inverter assembly cost = inverter assemblies in scope × assembly cost per inverter × build volume captured.
  • Total inverter assembly cost works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Inverter assembly cost per unit works out to 28.6 $ / piece at these inputs.
  • Variable inverter assembly cost works out to 2,610 $ at these inputs.
  • Fixed inverter program adder works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where build volume captured 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 build volume captured, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. The single blended per-assembly cost hides mix effects — a batch heavy in high-power SiC stages will run well above the average, so validate the blend against your actual BOM split.

Results at a glance

  • Total inverter assembly cost: 2,860 $ (headline result)
  • Inverter assembly cost per unit: 28.6 $ / piece
  • Variable inverter assembly cost: 2,610 $
  • Fixed inverter program adder: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Inverter Assembly Cost calculator, set build volume captured to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.