Following an official notice dated 14 August 2026 and publication in the Executive Yuan Gazette on 17 August 2026, Taiwan’s Bureau of Standards, Metrology and Inspection (BSMI) published an English draft proposal on 18 August 2026 to amend the legal inspection requirements for power supply equipment, including Power Conversion Systems (PCS) and photovoltaic (PV) inverters.

The proposal would expand mandatory inspection coverage to models rated up to 360 kW and maintain two conformity-assessment routes: Registration of Product Certification (RPC) or Type-Approved Batch Inspection (TABI). It introduces updated national standards, including CNS 16280:2026 for grid-connected energy-storage PCS, CNS 16281:2026 for information-security requirements applicable to energy-storage PCS, and CNS 16279:2026 for information security of PV inverters and monitoring units.

The draft also preserves safety, electromagnetic compatibility, CNS 15663 restricted-substance marking, and Commodity Inspection Mark requirements, including Chinese warnings for equipment intended only for industrial environments. Newly covered products above 100 kW and up to 360 kW are proposed to become subject to mandatory inspection on 1 July 2028. Certificate extensions from that date would need revised-standard test reports and technical documents. Public comments are accepted through 16 October 2026.

This regulatory update is assessed as Medium Impact. The measure is still a draft under public consultation, but it proposes material changes to mandatory inspection scope, certification documentation, testing standards, cybersecurity requirements, restricted-substance marking, and product labeling for PCS and PV inverters.

Key reasons for Medium Impact:

• Mandatory inspection would expand to products rated above 100 kW and up to 360 kW.
• Revised national standards would affect safety, electromagnetic compatibility, grid-connection, and cybersecurity assessment.
• Certificate extensions from 1 July 2028 would require revised-standard test reports and technical documents.
• Importers and manufacturers must plan for RPC or TABI, Commodity Inspection Mark requirements, and C02 import control.
• Stakeholders have until 16 October 2026 to submit comments.

Who is affected?

Manufacturers, importers, certificate holders, testing laboratories, and suppliers of PCS and PV inverters up to 360 kW, including energy-storage PCS and PV inverter monitoring units.

Conclusion:

Although the proposal is not yet final, affected stakeholders should evaluate product portfolios, testing evidence, cybersecurity documentation, labeling, and certification timing before the proposed 1 July 2028 expansion takes effect.