BESS PCS Cabinet Factory Acceptance Yield Calculator

What this calculator does

• Calculate power conversion system cabinet first-pass yield at factory acceptance test for grid-scale BESS production by comparing PCS cabinets passing all FAT checks against total cabinets tested and measuring the gap to the yield target.
• Use it when the PCS cabinet factory acceptance test line needs a clean yield rate for the weekly quality review and you need to decide whether to escalate an inverter power stage or control board issue.

Formula used

• PCS cabinet FAT yield rate = PCS cabinets passing FAT / total PCS cabinets entering FAT x 100
• PCS cabinet yield gap to target = FAT yield rate - target PCS cabinet yield rate

Inputs explained

• PCS cabinets passing factory acceptance test: Enter the count of PCS cabinets that passed all FAT steps including power stage test, control communication, protection trip, and efficiency check.
• Total PCS cabinets entering factory acceptance test: Use the total PCS cabinet population that entered FAT in the same batch or week period.
• Target PCS cabinet yield rate: Enter the quality plan target or OEM contract yield requirement for PCS cabinet FAT first-pass rate.

How to use the result

Common questions

• What does a BESS PCS cabinet factory acceptance test typically cover? A BESS PCS FAT typically covers DC input insulation resistance, AC output voltage and frequency regulation, bidirectional power stage functional test at rated current, control board communication check, protection trip verification for over-voltage, under-voltage, over-current, and anti-islanding, and round-trip efficiency measurement at one or more power levels.