Outdoor Power Equipment worked example

Noise Compliance Load with noise test cell load of 4.5 kW: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop noise test cell load to 4.5 kW, then walk the calculation through step by step. Estimate the electricity cost of noise and sound-power compliance testing from test cell load, test hours, and your blended electricity rate.

The inputs for this scenario

  • Noise test cell load: 4.5 kW (the input this scenario stresses; the baseline uses 9)
  • Sound test hours: 6 hr (held at the documented default)
  • Blended electricity rate: 0.12 $ / kWh (held at the documented default)
  • Units sound-tested: 400 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total noise test energy cost = noise test cell load × sound test hours × blended electricity rate.
  • Noise test energy used works out to 27 kWh at these inputs, and this is the headline figure for the scenario.
  • Total noise test energy cost works out to 3.24 $ at these inputs.
  • Noise test energy cost per unit works out to 0.01 $ / piece at these inputs.
  • Hourly noise test energy cost works out to 0.54 $ / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where noise test cell load sits at 9 kW and the headline result is 54 kWh, this scenario comes in 50% below the baseline at 27 kWh.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to noise test cell load, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It captures only the cell's connected electrical load over the test window; it ignores HVAC conditioning of the chamber, compressed air, instrumentation standby draw, and demand charges, so treat the result as a floor on true noise-test energy cost.

Results at a glance

  • Noise test energy used: 27 kWh (headline result)
  • Total noise test energy cost: 3.24 $
  • Noise test energy cost per unit: 0.01 $ / piece
  • Hourly noise test energy cost: 0.54 $ / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Noise Compliance Load calculator, set noise test cell load to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.