Applications: Stationary Energy Storage (Industry)

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Frequent BESS Non Conformities Found During Factory Acceptance Testing BESS require rigorous testing to identify non conformities (NCs). Most NCs are related to the safety systems of the BESS.

During the Factory Acceptance Testing (FAT) of BESS production by third party quality control company, the NCs are classified as Critical(*)/ Major(**) / Minor(***) / Opportunity for Improvement.

Safety systems comprise 20% of non-conformities

Depending on contract struction, buyer can require corrective actions from the manufacturer for NCs before shipping

FAT’s capacity tests shows that 66% of BESS projects missed at least one acceptance criteria not met.

Source: STS LinkedIn, Sinovoltaics & Volytica

2025 BATTERY ENCLOSURE NON-CONFORMITIES

FAILURES FOUND DURING CAPACITY TEST DATA ANALYSIS

(*) Critical: A defect that is likely in hazardous or unsafe conditions for the individual using the product, likely to cause damages to other products or property or that is generally contravening mandatory regulations. (**) Major:: A defect that may reduce the stability of the product or cause the product to fail to perform its function. Obvious appearance defects. Those are likely to reduce the sales ability of the product. (***) Minor: A defect that doesn't reduce the usability of the product but is nevertheless a workmanship defect beyond the acceptable quality standard

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