Grid-Scale Battery Energy Storage Systems worked example

BMS Test Capacity at 66% bms test station uptime: a worked example

Suppose bms test station uptime falls to 66%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate net BMS board throughput per shift for grid-scale BESS production by combining BMS boards tested per test cycle, available test cycles, test station uptime, and BMS first-pass test yield.

The inputs for this scenario

  • BMS boards tested per test fixture cycle: 8 boards / cycle (held at the documented default)
  • Available BMS test cycles per shift: 60 cycles (held at the documented default)
  • BMS test station uptime: 66 % (the input this scenario stresses; the baseline uses 92)
  • BMS first-pass test yield: 98 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross BMS test capacity = BMS boards per test cycle x available BMS test cycles per shift.
  • Good BMS boards cleared per shift works out to 310 units at these inputs, and this is the headline figure for the scenario.
  • Gross BMS test capacity per shift works out to 480 units at these inputs.
  • BMS boards lost to test station downtime works out to 163 units at these inputs.
  • BMS boards failing first-pass test works out to 6.34 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where bms test station uptime sits at 92% and the headline result is 433 units, this scenario comes in 28.26% below the baseline at 310 units.
  • It computes good BMS boards cleared per shift by multiplying fixture batch size and available cycles for gross capacity, then derating by station uptime and first-pass yield. 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

  • Good BMS boards cleared per shift: 310 units (headline result)
  • Gross BMS test capacity per shift: 480 units
  • BMS boards lost to test station downtime: 163 units
  • BMS boards failing first-pass test: 6.34 units

Run it with your numbers

  • To rerun this with your own numbers, open the live BMS Test Capacity calculator, set bms test station uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.