Grid-Scale Battery Energy Storage Systems worked example

Thermal Runaway Spacing with auxiliary hvac load per thermal runaway containment zone of 4 kW: a worked example

Suppose auxiliary hvac load per thermal runaway containment zone falls to 4 kW. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate the continuous auxiliary thermal management load cost per thermal runaway containment zone in a grid-scale BESS enclosure by combining zone HVAC load, daily operating hours, electricity rate, and MWh stored within the zone.

The inputs for this scenario

  • Auxiliary HVAC load per thermal runaway containment zone: 4 kW (the input this scenario stresses; the baseline uses 8)
  • Daily thermal monitoring and cooling hours: 24 hr (held at the documented default)
  • Site electricity rate: 0.09 $ / kWh (held at the documented default)
  • Usable MWh stored within the containment zone: 2 MWh (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total zone thermal management cost per day = zone HVAC load x daily monitoring hours x site electricity rate.
  • Auxiliary thermal management energy per day (kWh) works out to 96 kWh at these inputs, and this is the headline figure for the scenario.
  • Total zone thermal management cost per day works out to 8.64 $ at these inputs.
  • Thermal management cost per MWh in containment zone works out to 4.32 $ / piece at these inputs.
  • Hourly zone thermal management cost works out to 0.36 $ / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where auxiliary hvac load per thermal runaway containment zone sits at 8 kW and the headline result is 192 kWh, this scenario comes in 50% below the baseline at 96 kWh.
  • It computes the daily auxiliary energy and operating cost of thermal management for one BESS containment zone, and the resulting thermal management cost per MWh stored. 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

  • Auxiliary thermal management energy per day (kWh): 96 kWh (headline result)
  • Total zone thermal management cost per day: 8.64 $
  • Thermal management cost per MWh in containment zone: 4.32 $ / piece
  • Hourly zone thermal management cost: 0.36 $ / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Thermal Runaway Spacing calculator, set auxiliary hvac load per thermal runaway containment zone to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.