The compatibility matrix provides a structured overview of the dependencies between nozzles at hydrogen refuelling stations and vehicle tank connections. It serves as a guide for operators, vehicle manufacturers and planners when assessing technical interoperability.
In principle, misfuelling is technically impossible: A 700-bar refueling system cannot be coupled to a 350-bar tank connection, so it is not possible to overpressurize the vehicle.
The matrix differentiates between refuelling systems according to pressure level and refuelling speed:
Pressure stages
- 35 = 35 MPa = 350 bar
- 70 = 70 MPa = 700 bar
Refuelling speeds
- H (Normal Flow) (N) up to approx. ≤ 60 g/s => typical car refuelling (350 & 700 bar)
- MF (Medium Flow): approx. 90 – 120 g/s => Buses, light commercial vehicles, early truck setups
- HF (High Flow): 120 g/s to ≈ 300 g/s => heavy commercial vehicles, high throughputs
Two hydrogen purity levels are also taken into account:
- Grade D: FCEV quality (99.97% H₂ purity), required by AFIR for all public hydrogen refuelling stations in Europe
- Grade F: approx. 98 % purity, not approved for public filling stations in Europe
The compatibilities shown are based on current and future standards for the interoperability of hydrogen refuelling systems, in particular EN 17127 and EN ISO 17268-1 and -2 for refuelling connections up to 700 bar. The EN ISO 17268-2 standard is currently still being coordinated and is expected to be published in 2026.
The matrix does not represent an operational release, but a technical orientation for the classification of compatibilities in the existing and future hydrogen infrastructure ecosystem.
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