Metrology is the law of measurement: selling electricity by the kWh makes an EV charger a commercial measuring device subject to NIST Handbook 44 accuracy and certification requirements. In a parking facility:
- Certification deadlines are compliance items with dates, enforced state by state.
- Billing models that avoid per-kWh sale (session or time pricing) interact differently with the rules.
Considerations
- Vendor contracts should assign metrology compliance explicitly. When the charger becomes a meter, it inherits a meter’s law.