Minutes of the eleventh meeting of the IWG on EV/HFCV Retrofit Systems held on 9 September 2026. The group adopted the provisional agenda and reviewed the draft UN Regulation on EV/HFCV retrofit systems. Key discussions addressed the regulatory concept for approval of the Electric Powertrain Retrofit System combined with installation requirements and vehicle testing, vehicle scope including possible exclusion of older vehicles and those subject to UN Regulations Nos. 155 and 156, and confirmation that HFCV provisions would remain as placeholders for later development. The updated working document will be circulated before submission to GRPE in October 2026.

This regulation proposes uniform provisions for the approval of electric powertrain retrofit systems (EPRS) intended for the conversion of vehicles of categories M and N to electric propulsion. It establishes requirements for EPRS design, installation by authorized installers, type approval procedures, application ranges, markings, conformity of production, and modification or extension of approvals. Specific requirements for compliance with applicable UN Regulations are defined, including electromagnetic compatibility, braking, power measurement, rechargeable energy storage systems, and mass and dimension limits. The regulation applies to both pure electric vehicles (EV) and hydrogen fuel cell vehicles (HFCV).

The agenda includes adoption of the coordination and organization of work with reference to GRPE-92-14, EV/HFCV-02-02, GRPE-93-22-Rev.1, GRSP-78-17, GRVA-25-19, WP.29-199-16, and other documents, electrical safety review, braking, EMC, power determination and battery range, UN draft discussion, and any other business, with a next meeting scheduled for 8th October online.

Updates and comments on the draft uniform provisions establishing harmonized methods for the approval of vehicles transformed with electric powertrain retrofit systems for categories M₁–M₃ and N₁–N₃. Requirements cover application for approval, markings on transformation plates, type approval procedures, general and specific requirements for retrofit systems, application range definitions, installer authorization and responsibilities, information to be provided by manufacturers to installers, end-user manuals, conformity of production procedures, modification and extension of approval, withdrawal of approvals, and notification procedures to contracting parties. Specific compliance is required with UN R10, UN R13, UN R13H, UN R85, UN R100, UN R121, UN R134, UN R138, UN R79, UN R155, UN R154, and UN R49, with staged implementation dates for certain requirements such as rechargeable energy storage system compliance from 1 September 2027 onwards and braking system compliance from 1 September 2026 onwards.