Rotational Molding worked example

Energy Per Cycle with oven and machine connected load of 6 kW: a worked example

Suppose oven and machine connected load falls to 6 kW. This page works the full calculation at that level so you can see exactly which result moves and by how much. Energy per cycle turns a rotomolding oven's connected load and cycle time into a hard dollar cost, then splits it across the parts that came off the arm.

The inputs for this scenario

  • Oven and machine connected load: 6 kW (the input this scenario stresses; the baseline uses 12)
  • Cycle runtime (heat plus cool): 8 hr (held at the documented default)
  • Electricity or gas rate: 0.12 $ / kWh (held at the documented default)
  • Parts produced in the cycle: 1,000 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Energy cost = connected load × runtime × energy rate.
  • Energy cost works out to 5.76 $ / unit at these inputs, and this is the headline figure for the scenario.
  • Energy used works out to 48 kWh at these inputs.
  • Cost per piece works out to 0.01 $ / piece at these inputs.
  • Hourly cost works out to 0.72 $ / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where oven and machine connected load sits at 12 kW and the headline result is 11.52 $ / unit, this scenario comes in 50% below the baseline at 5.76 $ / unit.
  • It computes the energy cost of one oven cycle from connected load, runtime, and rate, then divides by parts produced to get energy cost per piece. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Energy cost: 5.76 $ / unit (headline result)
  • Energy used: 48 kWh
  • Cost per piece: 0.01 $ / piece
  • Hourly cost: 0.72 $ / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Energy Per Cycle calculator, set oven and machine connected load to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.