Wearable Medical Sensors worked example

Battery Runtime with sensor charging and burn-in load of 30 kW: a worked example in wearable medical sensors

Push sensor charging and burn-in load up to 30 kW and the picture changes. This example computes every intermediate figure at that operating point. Use it when battery runtime in wearable medical sensors is up for an upgrade and you want a defensible savings story.

The inputs for this scenario

  • Sensor charging and burn-in load: 30 kW (raised for this scenario; the documented default is 12)
  • Battery conditioning runtime: 8 hr (unchanged)
  • Blended electricity rate: 0.12 $ / kWh (unchanged)
  • Sensors conditioned during runtime: 1,000 units (unchanged)

Working through the calculation

  • Applying the documented formula (Total battery runtime energy cost = battery runtime connected load × battery runtime runtime × blended electricity rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 240 kWh for battery runtime energy used, the number this scenario is built around.
  • At this operating point the engine returns 28.8 $ for total battery runtime energy cost.
  • At this operating point the engine returns 0.03 $ / piece for energy cost per kwh.
  • At this operating point the engine returns 3.6 $ / hr for hourly battery runtime energy cost.

How this compares with the baseline

  • Against the tool's baseline example, where sensor charging and burn-in load sits at 12 kW and the headline result is 96 kWh, this scenario comes in 150% above the baseline at 240 kWh.
  • It multiplies connected charging load by runtime and electricity rate to get total energy cost, and divides energy by units to give a per-sensor figure. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Battery runtime energy used: 240 kWh (headline result)
  • Total battery runtime energy cost: 28.8 $
  • Energy cost per kWh: 0.03 $ / piece
  • Hourly battery runtime energy cost: 3.6 $ / hr

Run it with your numbers

  • Every input above is editable in the live Battery Runtime calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.